Silicon tetrafluoride

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Gas phase thermochemistry data

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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-386.0 ± 0.2kcal/molReviewCox, Wagman, et al., 1984CODATA Review value
Δfgas-385.980kcal/molReviewChase, 1998Data last reviewed in June, 1976
Quantity Value Units Method Reference Comment
gas,1 bar67.58 ± 0.12cal/mol*KReviewCox, Wagman, et al., 1984CODATA Review value
gas,1 bar67.579cal/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 (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

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Temperature (K) 298. to 1000.1000. to 6000.
A 10.2739025.63870
B 38.068910.112718
C -36.12271-0.023413
D 12.334200.001654
E -0.102065-1.287970
F -390.7839-397.3059
G 69.5852193.00949
H -385.9799-385.9799
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in June, 1976 Data last reviewed in June, 1976

Phase change data

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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
Pc36.6600atmN/ABooth and Swinehart, 1935Uncertainty assigned by TRC = 0.0499 atm; TRC

Antoine Equation Parameters

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

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Temperature (K) A B C Reference Comment
163.16 to 186.918.371951643.69818.344Pace and Mosser, 1963Coefficents calculated by NIST from author's data.
129. to 178.37.104071220.564-6.884Stull, 1947Coefficents calculated by NIST from author's data.

Enthalpy of sublimation

ΔsubH (kcal/mol) Temperature (K) Reference Comment
6.17148. 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

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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>29.10 ± 0.50kcal/molN/AKawamata, Neigishi, et al., 1996gas phase; B
Δr68.0 ± 5.0kcal/molIMRBMurphy and Beauchamp, 1977gas phase; Fluoride Affinity: <BF3, >iPr2BF; B
Δr60.0 ± 4.0kcal/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
Δr54.1 ± 4.0kcal/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
Δr51.kcal/molICRLarson and McMahon, 1984gas phase; switching reaction(F-)H2O, DG+-2. kcal/mol; 70 ARS/YAM; M

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

By formula: CN- + F4Si = (CN- • F4Si)

Quantity Value Units Method Reference Comment
Δr27.2 ± 1.0kcal/molIMRELarson, Szulejko, et al., 1988gas phase; B,M
Quantity Value Units Method Reference Comment
Δr30.cal/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
Δr18.30 ± 0.50kcal/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
Δr23.4 ± 2.0kcal/molIMRELarson and McMahon, 1985gas phase; B,M
Quantity Value Units Method Reference Comment
Δr22.cal/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
Δr16.8 ± 2.0kcal/molIMRELarson and McMahon, 1985gas phase; B,M

C6H5NO2- + Silicon tetrafluoride = C6H5F4NO2Si-

By formula: C6H5NO2- + F4Si = C6H5F4NO2Si-

Quantity Value Units Method Reference Comment
Δr35.0 ± 2.0kcal/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Δr15.50 ± 0.60kcal/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
Δr33.0 ± 2.0kcal/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Δr13.90 ± 0.60kcal/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
Δr32.0 ± 2.0kcal/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Δr12.00 ± 0.60kcal/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
Δr35.0 ± 3.0kcal/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Δr15.60 ± 0.60kcal/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
Δr24.0 ± 2.0kcal/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Δr13.20 ± 0.60kcal/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
Δr21.0 ± 1.0kcal/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Δr4.20 ± 0.60kcal/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
Δr9.6 ± 2.0kcal/molIMREHiraoka, Nasu, et al., 2000gas phase; B
Quantity Value Units Method Reference Comment
Δr5.13kcal/molIMREHiraoka, Nasu, et al., 2000gas phase; B

C6H4FNO2- + Silicon tetrafluoride = C6H4F5NO2Si-

By formula: C6H4FNO2- + F4Si = C6H4F5NO2Si-

Quantity Value Units Method Reference Comment
Δr12.50 ± 0.60kcal/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
Δr11.70 ± 0.60kcal/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
Δr12.50 ± 0.60kcal/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
Δr13.60 ± 0.60kcal/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
Δr15.20 ± 0.60kcal/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
Δr15.70 ± 0.60kcal/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
Δr7.20 ± 0.60kcal/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
Δr8.20 ± 0.60kcal/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
Δr13.70 ± 0.60kcal/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
Δr11.30 ± 0.60kcal/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
Δr11.70 ± 0.60kcal/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
Δr10.60 ± 0.60kcal/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
Δr10.20 ± 0.60kcal/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
Δr9.60 ± 0.60kcal/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
Δr9.20 ± 0.60kcal/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
Δr7.30 ± 0.60kcal/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
Δr19.80 ± 0.60kcal/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
Δr22.00 ± 0.60kcal/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
Δr10.90 ± 0.60kcal/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
Δr13.90 ± 0.60kcal/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
Δr9.50 ± 0.60kcal/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

IR Spectrum

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Data compiled by: Coblentz Society, Inc.

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


Mass spectrum (electron ionization)

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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

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Additional Data

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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

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Vibrational and/or electronic energy levels

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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, IR Spectrum, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, 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]

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, IR Spectrum, Mass spectrum (electron ionization), Vibrational and/or electronic energy levels, References