Silicon tetrafluoride


Gas phase thermochemistry data

Go To: Top, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, IR Spectrum, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, NIST Free Links, NIST Subscription Links, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Quantity Value Units Method Reference Comment
Δfgas-1615.0 ± 0.8kJ/molReviewCox, Wagman, et al., 1984CODATA Review value
Δfgas-1614.94kJ/molReviewChase, 1998Data last reviewed in June, 1976
Quantity Value Units Method Reference Comment
gas,1 bar282.76 ± 0.50J/mol*KReviewCox, Wagman, et al., 1984CODATA Review value
gas,1 bar282.75J/mol*KReviewChase, 1998Data last reviewed in June, 1976

Gas Phase Heat Capacity (Shomate Equation)

Cp° = A + B*t + C*t2 + D*t3 + E/t2
H° − H°298.15= A*t + B*t2/2 + C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 − E/(2*t2) + G
    Cp = heat capacity (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

View plot Requires a JavaScript / HTML 5 canvas capable browser.

View table.

Temperature (K) 298. to 1000.1000. to 6000.
A 42.98600107.2723
B 159.28030.471612
C -151.1374-0.097960
D 51.606290.006921
E -0.427040-5.388866
F -1635.040-1662.328
G 291.1445389.1517
H -1614.940-1614.940
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in June, 1976 Data last reviewed in June, 1976

Phase change data

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, IR Spectrum, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, NIST Free Links, NIST Subscription Links, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
BS - Robert L. Brown and Stephen E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos

Quantity Value Units Method Reference Comment
Tboil187.KN/APCR Inc., 1990BS
Quantity Value Units Method Reference Comment
Tc259.KN/ABooth and Swinehart, 1935Uncertainty assigned by TRC = 0.02 K; TRC
Quantity Value Units Method Reference Comment
Pc37.1457barN/ABooth and Swinehart, 1935Uncertainty assigned by TRC = 0.0506 bar; TRC

Antoine Equation Parameters

log10(P) = A − (B / (T + C))
    P = vapor pressure (bar)
    T = temperature (K)

View plot Requires a JavaScript / HTML 5 canvas capable browser.

Temperature (K) A B C Reference Comment
163.16 to 186.918.377661643.69818.344Pace and Mosser, 1963Coefficents calculated by NIST from author's data.
129. to 178.37.109781220.564-6.884Stull, 1947Coefficents calculated by NIST from author's data.

Enthalpy of sublimation

ΔsubH (kJ/mol) Temperature (K) Reference Comment
25.8148. to 183.Patnode and Papish, 1929AC

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:


Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry data, Phase change data, Gas phase ion energetics data, Ion clustering data, IR Spectrum, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, NIST Free Links, NIST Subscription Links, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Individual Reactions

Fluorine anion + Silicon tetrafluoride = (Fluorine anion • Silicon tetrafluoride)

By formula: F- + F4Si = (F- • F4Si)

Quantity Value Units Method Reference Comment
Δr>121.8 ± 2.1kJ/molN/AKawamata, Neigishi, et al., 1996gas phase; B
Δr285. ± 21.kJ/molIMRBMurphy and Beauchamp, 1977gas phase; Fluoride Affinity: <BF3, >iPr2BF; B
Δr251. ± 17.kJ/molIMRELarson and McMahon, 1985gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable.; B,M
Quantity Value Units Method Reference Comment
Δr226. ± 17.kJ/molIMRELarson and McMahon, 1985gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable.; B
Δr210.kJ/molICRLarson and McMahon, 1984gas phase; switching reaction(F-)H2O, DG+-8. kJ/mol; 70 ARS/YAM; M

CN- + Silicon tetrafluoride = (CN- • Silicon tetrafluoride)

By formula: CN- + F4Si = (CN- • F4Si)

Quantity Value Units Method Reference Comment
Δr114. ± 4.2kJ/molIMRELarson, Szulejko, et al., 1988gas phase; B,M
Quantity Value Units Method Reference Comment
Δr130.J/mol*KN/ALarson, Szulejko, et al., 1988gas phase; switching reaction,Thermochemical ladder(CN-)H2O, Entropy change calculated or estimated; Payzant, Yamdagni, et al., 1971; M
Quantity Value Units Method Reference Comment
Δr76.6 ± 2.1kJ/molIMRELarson, Szulejko, et al., 1988gas phase; B,M

Chlorine anion + Silicon tetrafluoride = (Chlorine anion • Silicon tetrafluoride)

By formula: Cl- + F4Si = (Cl- • F4Si)

Quantity Value Units Method Reference Comment
Δr97.9 ± 8.4kJ/molIMRELarson and McMahon, 1985gas phase; B,M
Quantity Value Units Method Reference Comment
Δr92.J/mol*KN/ALarson and McMahon, 1985gas phase; switching reaction,Thermochemical ladder(Cl-)t-C4H9OH, Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Δr70.3 ± 8.4kJ/molIMRELarson and McMahon, 1985gas phase; B,M

C6H5NO2- + Silicon tetrafluoride = C6H5F4NO2Si-

By formula: C6H5NO2- + F4Si = C6H5F4NO2Si-

Quantity Value Units Method Reference Comment
Δr146. ± 8.4kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Δr64.9 ± 2.5kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4FNO2- + Silicon tetrafluoride = C6H4F5NO2Si-

By formula: C6H4FNO2- + F4Si = C6H4F5NO2Si-

Quantity Value Units Method Reference Comment
Δr138. ± 8.4kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Δr58.2 ± 2.5kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4ClNO2- + Silicon tetrafluoride = C6H4ClF4NO2Si-

By formula: C6H4ClNO2- + F4Si = C6H4ClF4NO2Si-

Quantity Value Units Method Reference Comment
Δr134. ± 8.4kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Δr50.2 ± 2.5kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C7H7NO2- + Silicon tetrafluoride = C7H7F4NO2Si-

By formula: C7H7NO2- + F4Si = C7H7F4NO2Si-

Quantity Value Units Method Reference Comment
Δr146. ± 13.kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Δr65.3 ± 2.5kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

p-Benzoquinone anion + Silicon tetrafluoride = C6H4F4O2Si-

By formula: C6H4O2- + F4Si = C6H4F4O2Si-

Quantity Value Units Method Reference Comment
Δr100. ± 8.4kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Δr55.2 ± 2.5kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4N2O4- + Silicon tetrafluoride = C6H4F4N2O4Si-

By formula: C6H4N2O4- + F4Si = C6H4F4N2O4Si-

Quantity Value Units Method Reference Comment
Δr87.9 ± 4.2kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Δr17.6 ± 2.5kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

F5Si- + Silicon tetrafluoride = F9Si2-

By formula: F5Si- + F4Si = F9Si2-

Quantity Value Units Method Reference Comment
Δr40. ± 8.4kJ/molIMREHiraoka, Nasu, et al., 2000gas phase; B
Quantity Value Units Method Reference Comment
Δr21.5kJ/molIMREHiraoka, Nasu, et al., 2000gas phase; B

C6H4FNO2- + Silicon tetrafluoride = C6H4F5NO2Si-

By formula: C6H4FNO2- + F4Si = C6H4F5NO2Si-

Quantity Value Units Method Reference Comment
Δr52.3 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4ClNO2- + Silicon tetrafluoride = C6H4ClF4NO2Si-

By formula: C6H4ClNO2- + F4Si = C6H4ClF4NO2Si-

Quantity Value Units Method Reference Comment
Δr49.0 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4FNO2- + Silicon tetrafluoride = C6H4F5NO2Si-

By formula: C6H4FNO2- + F4Si = C6H4F5NO2Si-

Quantity Value Units Method Reference Comment
Δr52.3 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4ClNO2- + Silicon tetrafluoride = C6H4ClF4NO2Si-

By formula: C6H4ClNO2- + F4Si = C6H4ClF4NO2Si-

Quantity Value Units Method Reference Comment
Δr56.9 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C7H7NO2- + Silicon tetrafluoride = C7H7F4NO2Si-

By formula: C7H7NO2- + F4Si = C7H7F4NO2Si-

Quantity Value Units Method Reference Comment
Δr63.6 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C7H7NO2- + Silicon tetrafluoride = C7H7F4NO2Si-

By formula: C7H7NO2- + F4Si = C7H7F4NO2Si-

Quantity Value Units Method Reference Comment
Δr65.7 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4N2O4- + Silicon tetrafluoride = C6H4F4N2O4Si-

By formula: C6H4N2O4- + F4Si = C6H4F4N2O4Si-

Quantity Value Units Method Reference Comment
Δr30.1 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4N2O4- + Silicon tetrafluoride = C6H4F4N2O4Si-

By formula: C6H4N2O4- + F4Si = C6H4F4N2O4Si-

Quantity Value Units Method Reference Comment
Δr34.3 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4NO3- + Silicon tetrafluoride = C6H4F4NO3Si-

By formula: C6H4NO3- + F4Si = C6H4F4NO3Si-

Quantity Value Units Method Reference Comment
Δr57.3 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4BrNO2- + Silicon tetrafluoride = C6H4BrF4NO2Si-

By formula: C6H4BrNO2- + F4Si = C6H4BrF4NO2Si-

Quantity Value Units Method Reference Comment
Δr47.3 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4BrNO2- + Silicon tetrafluoride = C6H4BrF4NO2Si-

By formula: C6H4BrNO2- + F4Si = C6H4BrF4NO2Si-

Quantity Value Units Method Reference Comment
Δr49.0 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C7H4F3NO2- + Silicon tetrafluoride = C7H4F7NO2Si-

By formula: C7H4F3NO2- + F4Si = C7H4F7NO2Si-

Quantity Value Units Method Reference Comment
Δr44.4 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C10H7NO2- + Silicon tetrafluoride = C10H7F4NO2Si-

By formula: C10H7NO2- + F4Si = C10H7F4NO2Si-

Quantity Value Units Method Reference Comment
Δr42.7 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C7H4F3NO2- + Silicon tetrafluoride = C7H4F7NO2Si-

By formula: C7H4F3NO2- + F4Si = C7H4F7NO2Si-

Quantity Value Units Method Reference Comment
Δr40.2 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C7H4N2O2- + Silicon tetrafluoride = C7H4F4N2O2Si-

By formula: C7H4N2O2- + F4Si = C7H4F4N2O2Si-

Quantity Value Units Method Reference Comment
Δr38.5 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C8H3F6NO2- + Silicon tetrafluoride = C8H3F10NO2Si-

By formula: C8H3F6NO2- + F4Si = C8H3F10NO2Si-

Quantity Value Units Method Reference Comment
Δr30.5 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C8H9NO2- + Silicon tetrafluoride = C8H9F4NO2Si-

By formula: C8H9NO2- + F4Si = C8H9F4NO2Si-

Quantity Value Units Method Reference Comment
Δr82.8 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C13H10O- + Silicon tetrafluoride = C13H10F4OSi-

By formula: C13H10O- + F4Si = C13H10F4OSi-

Quantity Value Units Method Reference Comment
Δr92.0 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C7H4F3NO2- + Silicon tetrafluoride = C7H4F7NO2Si-

By formula: C7H4F3NO2- + F4Si = C7H4F7NO2Si-

Quantity Value Units Method Reference Comment
Δr45.6 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4NO3- + Silicon tetrafluoride = C6H4F4NO3Si-

By formula: C6H4NO3- + F4Si = C6H4F4NO3Si-

Quantity Value Units Method Reference Comment
Δr58.2 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C7H4N2O2- + Silicon tetrafluoride = C7H4F4N2O2Si-

By formula: C7H4N2O2- + F4Si = C7H4F4N2O2Si-

Quantity Value Units Method Reference Comment
Δr39.7 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Ion clustering data, IR Spectrum, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, NIST Free Links, NIST Subscription Links, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
MM - Michael M. Meot-Ner (Mautner)
LL - Sharon G. Lias and Joel F. Liebman
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

Quantity Value Units Method Reference Comment
IE (evaluated)15.24 ± 0.14eVN/AN/AL
Quantity Value Units Method Reference Comment
Proton affinity (review)502.9kJ/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Gas basicity476.6kJ/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Δf(+) ion-134. ± 7.1kJ/molN/AN/A 

Proton affinity at 298K

Proton affinity (kJ/mol) Reference Comment
492.0 ± 8.4Ling, Milburn, et al., 1999T = 298K; MM
492.9 ± 8.4Ling, Milburn, et al., 1999T = 298K; MM

Gas basicity at 298K

Gas basicity (review) (kJ/mol) Reference Comment
465.7 ± 8.4Ling, Milburn, et al., 1999T = 298K; MM
466.5 ± 8.4Ling, Milburn, et al., 1999T = 298K; MM

Protonation entropy at 298K

Protonation entropy (J/mol*K) Reference Comment
21.Ling, Milburn, et al., 1999T = 298K; MM
21.Ling, Milburn, et al., 1999T = 298K; MM

Ionization energy determinations

IE (eV) Method Reference Comment
15.29 ± 0.08ENDKickel, Fisher, et al., 1993LL
15.19PIMurphy and Beauchamp, 1977, 2LLK
15. ± 1.EIFarber and Srivastava, 1977LLK
15.7PELloyd and Roberts, 1975LLK
15.81 ± 0.02PEBassett and Lloyd, 1971LLK
15.92PEBull, Pullen, et al., 1970RDSH
15.7 ± 0.1EIMcDonald, Williams, et al., 1968RDSH
16.4PEBieri, Asbrink, et al., 1982Vertical value; LBLHLM
16.5PELloyd and Roberts, 1975Vertical value; LLK
16.45PEFehlner and Turner, 1974Vertical value; LLK
16.46 ± 0.04PEJonas, Schweitzer, et al., 1973Vertical value; LLK

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
SiF+28.8 ± 0.1?EIMcDonald, Williams, et al., 1968RDSH
SiF2+27.4 ± 0.1?EIMcDonald, Williams, et al., 1968RDSH
F3Si+16.21 ± 0.18FEND/DERKickel, Fisher, et al., 1993LL
SiF3+16.2 ± 0.1F?EIMcDonald, Williams, et al., 1968RDSH

Ion clustering data

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, NIST Free Links, NIST Subscription Links, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.

Clustering reactions

CN- + Silicon tetrafluoride = (CN- • Silicon tetrafluoride)

By formula: CN- + F4Si = (CN- • F4Si)

Quantity Value Units Method Reference Comment
Δr114. ± 4.2kJ/molIMRELarson, Szulejko, et al., 1988gas phase; B,M
Quantity Value Units Method Reference Comment
Δr130.J/mol*KN/ALarson, Szulejko, et al., 1988gas phase; switching reaction,Thermochemical ladder(CN-)H2O, Entropy change calculated or estimated; Payzant, Yamdagni, et al., 1971; M
Quantity Value Units Method Reference Comment
Δr76.6 ± 2.1kJ/molIMRELarson, Szulejko, et al., 1988gas phase; B,M

C6H4BrNO2- + Silicon tetrafluoride = C6H4BrF4NO2Si-

By formula: C6H4BrNO2- + F4Si = C6H4BrF4NO2Si-

Quantity Value Units Method Reference Comment
Δr47.3 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4BrNO2- + Silicon tetrafluoride = C6H4BrF4NO2Si-

By formula: C6H4BrNO2- + F4Si = C6H4BrF4NO2Si-

Quantity Value Units Method Reference Comment
Δr49.0 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4ClNO2- + Silicon tetrafluoride = C6H4ClF4NO2Si-

By formula: C6H4ClNO2- + F4Si = C6H4ClF4NO2Si-

Quantity Value Units Method Reference Comment
Δr49.0 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4ClNO2- + Silicon tetrafluoride = C6H4ClF4NO2Si-

By formula: C6H4ClNO2- + F4Si = C6H4ClF4NO2Si-

Quantity Value Units Method Reference Comment
Δr56.9 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4ClNO2- + Silicon tetrafluoride = C6H4ClF4NO2Si-

By formula: C6H4ClNO2- + F4Si = C6H4ClF4NO2Si-

Quantity Value Units Method Reference Comment
Δr134. ± 8.4kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Δr50.2 ± 2.5kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4FNO2- + Silicon tetrafluoride = C6H4F5NO2Si-

By formula: C6H4FNO2- + F4Si = C6H4F5NO2Si-

Quantity Value Units Method Reference Comment
Δr52.3 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4FNO2- + Silicon tetrafluoride = C6H4F5NO2Si-

By formula: C6H4FNO2- + F4Si = C6H4F5NO2Si-

Quantity Value Units Method Reference Comment
Δr138. ± 8.4kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Δr58.2 ± 2.5kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4FNO2- + Silicon tetrafluoride = C6H4F5NO2Si-

By formula: C6H4FNO2- + F4Si = C6H4F5NO2Si-

Quantity Value Units Method Reference Comment
Δr52.3 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4NO3- + Silicon tetrafluoride = C6H4F4NO3Si-

By formula: C6H4NO3- + F4Si = C6H4F4NO3Si-

Quantity Value Units Method Reference Comment
Δr58.2 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4NO3- + Silicon tetrafluoride = C6H4F4NO3Si-

By formula: C6H4NO3- + F4Si = C6H4F4NO3Si-

Quantity Value Units Method Reference Comment
Δr57.3 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4N2O4- + Silicon tetrafluoride = C6H4F4N2O4Si-

By formula: C6H4N2O4- + F4Si = C6H4F4N2O4Si-

Quantity Value Units Method Reference Comment
Δr87.9 ± 4.2kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Δr17.6 ± 2.5kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4N2O4- + Silicon tetrafluoride = C6H4F4N2O4Si-

By formula: C6H4N2O4- + F4Si = C6H4F4N2O4Si-

Quantity Value Units Method Reference Comment
Δr30.1 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H4N2O4- + Silicon tetrafluoride = C6H4F4N2O4Si-

By formula: C6H4N2O4- + F4Si = C6H4F4N2O4Si-

Quantity Value Units Method Reference Comment
Δr34.3 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

p-Benzoquinone anion + Silicon tetrafluoride = C6H4F4O2Si-

By formula: C6H4O2- + F4Si = C6H4F4O2Si-

Quantity Value Units Method Reference Comment
Δr100. ± 8.4kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Δr55.2 ± 2.5kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C6H5NO2- + Silicon tetrafluoride = C6H5F4NO2Si-

By formula: C6H5NO2- + F4Si = C6H5F4NO2Si-

Quantity Value Units Method Reference Comment
Δr146. ± 8.4kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Δr64.9 ± 2.5kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C7H4F3NO2- + Silicon tetrafluoride = C7H4F7NO2Si-

By formula: C7H4F3NO2- + F4Si = C7H4F7NO2Si-

Quantity Value Units Method Reference Comment
Δr45.6 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C7H4F3NO2- + Silicon tetrafluoride = C7H4F7NO2Si-

By formula: C7H4F3NO2- + F4Si = C7H4F7NO2Si-

Quantity Value Units Method Reference Comment
Δr44.4 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C7H4F3NO2- + Silicon tetrafluoride = C7H4F7NO2Si-

By formula: C7H4F3NO2- + F4Si = C7H4F7NO2Si-

Quantity Value Units Method Reference Comment
Δr40.2 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C7H4N2O2- + Silicon tetrafluoride = C7H4F4N2O2Si-

By formula: C7H4N2O2- + F4Si = C7H4F4N2O2Si-

Quantity Value Units Method Reference Comment
Δr39.7 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C7H4N2O2- + Silicon tetrafluoride = C7H4F4N2O2Si-

By formula: C7H4N2O2- + F4Si = C7H4F4N2O2Si-

Quantity Value Units Method Reference Comment
Δr38.5 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C7H7NO2- + Silicon tetrafluoride = C7H7F4NO2Si-

By formula: C7H7NO2- + F4Si = C7H7F4NO2Si-

Quantity Value Units Method Reference Comment
Δr63.6 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C7H7NO2- + Silicon tetrafluoride = C7H7F4NO2Si-

By formula: C7H7NO2- + F4Si = C7H7F4NO2Si-

Quantity Value Units Method Reference Comment
Δr65.7 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C7H7NO2- + Silicon tetrafluoride = C7H7F4NO2Si-

By formula: C7H7NO2- + F4Si = C7H7F4NO2Si-

Quantity Value Units Method Reference Comment
Δr146. ± 13.kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Δr65.3 ± 2.5kJ/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C8H3F6NO2- + Silicon tetrafluoride = C8H3F10NO2Si-

By formula: C8H3F6NO2- + F4Si = C8H3F10NO2Si-

Quantity Value Units Method Reference Comment
Δr30.5 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C8H9NO2- + Silicon tetrafluoride = C8H9F4NO2Si-

By formula: C8H9NO2- + F4Si = C8H9F4NO2Si-

Quantity Value Units Method Reference Comment
Δr82.8 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C10H7NO2- + Silicon tetrafluoride = C10H7F4NO2Si-

By formula: C10H7NO2- + F4Si = C10H7F4NO2Si-

Quantity Value Units Method Reference Comment
Δr42.7 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

C13H10O- + Silicon tetrafluoride = C13H10F4OSi-

By formula: C13H10O- + F4Si = C13H10F4OSi-

Quantity Value Units Method Reference Comment
Δr92.0 ± 2.5kJ/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

Chlorine anion + Silicon tetrafluoride = (Chlorine anion • Silicon tetrafluoride)

By formula: Cl- + F4Si = (Cl- • F4Si)

Quantity Value Units Method Reference Comment
Δr97.9 ± 8.4kJ/molIMRELarson and McMahon, 1985gas phase; B,M
Quantity Value Units Method Reference Comment
Δr92.J/mol*KN/ALarson and McMahon, 1985gas phase; switching reaction,Thermochemical ladder(Cl-)t-C4H9OH, Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
Δr70.3 ± 8.4kJ/molIMRELarson and McMahon, 1985gas phase; B,M

Fluorine anion + Silicon tetrafluoride = (Fluorine anion • Silicon tetrafluoride)

By formula: F- + F4Si = (F- • F4Si)

Quantity Value Units Method Reference Comment
Δr>121.8 ± 2.1kJ/molN/AKawamata, Neigishi, et al., 1996gas phase; B
Δr285. ± 21.kJ/molIMRBMurphy and Beauchamp, 1977gas phase; Fluoride Affinity: <BF3, >iPr2BF; B
Δr251. ± 17.kJ/molIMRELarson and McMahon, 1985gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable.; B,M
Quantity Value Units Method Reference Comment
Δr226. ± 17.kJ/molIMRELarson and McMahon, 1985gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable.; B
Δr210.kJ/molICRLarson and McMahon, 1984gas phase; switching reaction(F-)H2O, DG+-8. kJ/mol; 70 ARS/YAM; M

F5Si- + Silicon tetrafluoride = F9Si2-

By formula: F5Si- + F4Si = F9Si2-

Quantity Value Units Method Reference Comment
Δr40. ± 8.4kJ/molIMREHiraoka, Nasu, et al., 2000gas phase; B
Quantity Value Units Method Reference Comment
Δr21.5kJ/molIMREHiraoka, Nasu, et al., 2000gas phase; B

IR Spectrum

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, NIST Free Links, NIST Subscription Links, References, Notes

Data compiled by: Coblentz Society, Inc.

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director


Mass spectrum (electron ionization)

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, IR Spectrum, Vibrational and/or electronic energy levels, NIST Free Links, NIST Subscription Links, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Spectrum

Notice: This spectrum may be better viewed with a Javascript and HTML 5 enabled browser.

Mass spectrum
For Zoom
1.) Enter the desired X axis range (e.g., 100, 200)
2.) Check here for automatic Y scaling
3.) Press here to zoom

Additional Data

View image of digitized spectrum (can be printed in landscape orientation).

Due to licensing restrictions, this spectrum cannot be downloaded.

Owner NIST Mass Spectrometry Data Center
Collection (C) 2014 copyright by the U.S. Secretary of Commerce
on behalf of the United States of America. All rights reserved.
NIST MS number 1336

All mass spectra in this site (plus many more) are available from the NIST/EPA/NIH Mass Spectral Library. Please see the following for information about the library and its accompanying search program.


Vibrational and/or electronic energy levels

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, IR Spectrum, Mass spectrum (electron ionization), NIST Free Links, NIST Subscription Links, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Takehiko Shimanouchi

Symmetry:   Td     Symmetry Number σ = 12


 Sym.   No   Approximate   Selected Freq.  Infrared   Raman   Comments 
 Species   type of mode   Value   Rating   Value  Phase  Value  Phase

a1 1 Sym str 800  C  ia 800 S liq.
e 2 Deg deform 268  C  ia 268 W liq.
f2 3 Deg str 1032  B 1031.8 S gas 1010 W liq.
f2 4 Deg deform 389  B 389.35 S gas 390 W liq.

Source: Shimanouchi, 1972

Notes

SStrong
WWeak
iaInactive
B1~3 cm-1 uncertainty
C3~6 cm-1 uncertainty

References

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, IR Spectrum, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, NIST Free Links, NIST Subscription Links, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Cox, Wagman, et al., 1984
Cox, J.D.; Wagman, D.D.; Medvedev, V.A., CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1. [all data]

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

PCR Inc., 1990
PCR Inc., Research Chemicals Catalog 1990-1991, PCR Inc., Gainesville, FL, 1990, 1. [all data]

Booth and Swinehart, 1935
Booth, H.S.; Swinehart, C.F., Critical Constants and Vapor Pressure of Some Gaseous Fluorides of Group IV, J. Am. Chem. Soc., 1935, 57, 1337. [all data]

Pace and Mosser, 1963
Pace, E.L.; Mosser, J.S., Thermodynamic Properties of Silicon Tetrafluoride from 15 ºK to its Triple Point. The Entropy from Molecular and Spectroscopic Data, J. Chem. Phys., 1963, 39, 1, 154-158, https://doi.org/10.1063/1.1733993 . [all data]

Stull, 1947
Stull, Daniel R., Vapor Pressure of Pure Substances. Organic and Inorganic Compounds, Ind. Eng. Chem., 1947, 39, 4, 517-540, https://doi.org/10.1021/ie50448a022 . [all data]

Patnode and Papish, 1929
Patnode, W.I.; Papish, Jacob, The Vapor Pressure of Silicon Tetrafluoride, J. Phys. Chem., 1929, 34, 7, 1494-1496, https://doi.org/10.1021/j150313a010 . [all data]

Kawamata, Neigishi, et al., 1996
Kawamata, H.; Neigishi, Y.; Kishi, R.; Iwata, S.; Nakajima, A.; Kaya, K., Photoelectron Spectroscopy of Silicon-Fluorine Binary Cluster Anions (SinFm-), J. Chem. Phys., 1996, 105, 13, 5369, https://doi.org/10.1063/1.472377 . [all data]

Murphy and Beauchamp, 1977
Murphy, M.K.; Beauchamp, J.L., Methyl and Fluorine Substituent Effects on the Gas Phase Lewis Acidities of Silanes by ICR Spectroscopy, J. Am. Chem. Soc., 1977, 99, 15, 4992, https://doi.org/10.1021/ja00457a017 . [all data]

Larson and McMahon, 1985
Larson, J.W.; McMahon, T.B., Fluoride and chloride affinities of the main group oxides, fluorides, oxofluorides, and alkyls. Quantitative scales of lewis acidities from ICR halide exchange equilibria, J. Am. Chem. Soc., 1985, 107, 766. [all data]

Wenthold and Squires, 1995
Wenthold, P.G.; Squires, R.R., Bond dissociation energies of F2(-) and HF2(-). A gas-phase experimental and G2 theoretical study, J. Phys. Chem., 1995, 99, 7, 2002, https://doi.org/10.1021/j100007a034 . [all data]

Larson and McMahon, 1984
Larson, J.W.; McMahon, T.B., Fluoride and chloride affinities of main group oxides, fluorides, oxofluorides, and alkyls. Quantitative scales of lewis acidities from ion cyclotron resonance halide-exchange equilibria, J. Phys. Chem., 1984, 88, 1083. [all data]

Larson, Szulejko, et al., 1988
Larson, J.W.; Szulejko, J.E.; McMahon, T.B., Gas Phase Lewis Acid-Base Interactions. An Experimental Determination of Cyanide Binding Energies From Ion Cyclotron Resonance and High-Pressure Mass Spectrometric Equilibrium Measurements., J. Am. Chem. Soc., 1988, 110, 23, 7604, https://doi.org/10.1021/ja00231a004 . [all data]

Payzant, Yamdagni, et al., 1971
Payzant, J.D.; Yamdagni, R.; Kebarle, P., Hydration of CN-, NO2-, NO3-, and HO- in the gas phase, Can. J. Chem., 1971, 49, 3308. [all data]

Williamson, Knighton, et al., 2001
Williamson, D.H.; Knighton, W.B.; Grimsrud, E.P., Lewis acid-base interactions of SiF4 with molecular anions formed by electron capture reactions, Int. J. Mass Spectrom., 2001, 206, 1-2, 53-61, https://doi.org/10.1016/S1387-3806(00)00388-2 . [all data]

Hiraoka, Nasu, et al., 2000
Hiraoka, K.; Nasu, M.; Minamitsu, A.; Shimizu, A.; Yamabe, S., On the structure and stability of gas-phase cluster ions SiF3+(CO)(n), SiF3OH2+(SiF4)(n), SiF4H+(SiF4)(n), and F- (SiF4)(n), J. Phys. Chem. A, 2000, 104, 36, 8353-8359, https://doi.org/10.1021/jp000525d . [all data]

Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G., Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update, J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018 . [all data]

Ling, Milburn, et al., 1999
Ling, Y.; Milburn, R.K.; Hopkinson, A.C.; Bohme, D.K., Experimental and theoretical studies of the proton affinity of SiF4 and the structure of SiF4H+, J. Am. Soc. Mass Spectrom., 1999, 10, 848. [all data]

Kickel, Fisher, et al., 1993
Kickel, B.L.; Fisher, E.R.; Armentrout, P.B., Dissociative charge-transfer reactions of N+(3P), N2+(2g+), Ar+(2P3/2,1/2), and Kr+(2P3/2) with SiF4. Thermochemistry of SiF4+ and SiF3+, J. Phys. Chem., 1993, 97, 10198. [all data]

Murphy and Beauchamp, 1977, 2
Murphy, M.K.; Beauchamp, J.L., Photoionization mass spectrometry of the fluoromethylsilanes (CH3)n F4-nSi (n = 1-4), J. Am. Chem. Soc., 1977, 99, 2085. [all data]

Farber and Srivastava, 1977
Farber, M.; Srivastava, R.D., Mass spectrometric determination of the heats of formation of the silane fluorides, Chem. Phys. Lett., 1977, 51, 307. [all data]

Lloyd and Roberts, 1975
Lloyd, D.R.; Roberts, P.J., Photoelectron spectra of halides. VII. Variable temperature He(I) and He(II) studies of CF4, SiF4, and GeF4, J. Electron Spectrosc. Relat. Phenom., 1975, 7, 325. [all data]

Bassett and Lloyd, 1971
Bassett, P.J.; Lloyd, D.R., Photoelectron spectra of halides. Part I. Tetrafluorides and tetrachlorides of group IVB, J. Chem. Soc., 1971, (A), 641. [all data]

Bull, Pullen, et al., 1970
Bull, W.E.; Pullen, B.P.; Grimm, F.A.; Moddeman, W.E.; Schweitzer, G.K.; Carlson, T.A., High resolution photoelectron spectroscopy of carbon and silicon tetrafluorides, Inorg. Chem., 1970, 9, 2474. [all data]

McDonald, Williams, et al., 1968
McDonald, J.D.; Williams, C.H.; Thompson, J.C.; Margrave, J.L., Appearance potentials, ionization potentials and heats of formation for perfluorosilanes and perfluoroborosilanes, Advan. Chem. Ser., 1968, 72, 261. [all data]

Bieri, Asbrink, et al., 1982
Bieri, G.; Asbrink, L.; Von Niessen, W., 30.4-nm He(II) photoelectron spectra of organic molecules, J. Electron Spectrosc. Relat. Phenom., 1982, 27, 129. [all data]

Fehlner and Turner, 1974
Fehlner, T.P.; Turner, D.W., The photoelectron spectrum of SiF2, Inorg. Chem., 1974, 13, 754. [all data]

Jonas, Schweitzer, et al., 1973
Jonas, A.E.; Schweitzer, G.K.; Grimm, F.A.; Carlson, T.A., The photoelectron spectra of the tetrafluoro and tetramethyl compounds of the group IV elements, J. Electron Spectrosc. Relat. Phenom., 1973, 1, 29. [all data]

Shimanouchi, 1972
Shimanouchi, T., Tables of Molecular Vibrational Frequencies Consolidated Volume I, National Bureau of Standards, 1972, 1-160. [all data]


Notes

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, IR Spectrum, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, NIST Free Links, NIST Subscription Links, References