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Silicon tetrafluoride

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Gas phase thermochemistry data

Go To: Top, Reaction thermochemistry data, 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
Deltafgas-386.0 ± 0.2kcal/molReviewCox, Wagman, et al., 1984CODATA Review value
Deltafgas-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. - 1000.1000. - 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

Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry data, 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 bullet Silicon tetrafluoride)

By formula: F- + F4Si = (F- bullet F4Si)

Quantity Value Units Method Reference Comment
Deltar>29.10 ± 0.50kcal/molN/AKawamata, Neigishi, et al., 1996gas phase; B
Deltar68.0 ± 5.0kcal/molIMRBMurphy and Beauchamp, 1977gas phase; Fluoride Affinity: <BF3, >iPr2BF; B
Deltar60.0 ± 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
Deltar54.1 ± 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
Deltar51.kcal/molICRLarson and McMahon, 1984gas phase; switching reaction(F-)H2O, DG+-2. kcal/mol; 70 ARS/YAM; M

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

By formula: CN- + F4Si = (CN- bullet F4Si)

Quantity Value Units Method Reference Comment
Deltar27.2 ± 1.0kcal/molIMRELarson, Szulejko, et al., 1988gas phase; B,M
Quantity Value Units Method Reference Comment
Deltar30.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
Deltar18.30 ± 0.50kcal/molIMRELarson, Szulejko, et al., 1988gas phase; B,M

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

By formula: Cl- + F4Si = (Cl- bullet F4Si)

Quantity Value Units Method Reference Comment
Deltar23.4 ± 2.0kcal/molIMRELarson and McMahon, 1985gas phase; B,M
Quantity Value Units Method Reference Comment
Deltar22.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
Deltar16.8 ± 2.0kcal/molIMRELarson and McMahon, 1985gas phase; B,M

C6H5NO2- + Silicon tetrafluoride = C6H5F4NO2Si-

By formula: C6H5NO2- + F4Si = C6H5F4NO2Si-

Quantity Value Units Method Reference Comment
Deltar35.0 ± 2.0kcal/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Deltar15.50 ± 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
Deltar33.0 ± 2.0kcal/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Deltar13.90 ± 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
Deltar32.0 ± 2.0kcal/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Deltar12.00 ± 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
Deltar35.0 ± 3.0kcal/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Deltar15.60 ± 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
Deltar24.0 ± 2.0kcal/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Deltar13.20 ± 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
Deltar21.0 ± 1.0kcal/molTDAsWilliamson, Knighton, et al., 2001gas phase; at 150 C; B
Quantity Value Units Method Reference Comment
Deltar4.20 ± 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
Deltar9.6 ± 2.0kcal/molIMREHiraoka, Nasu, et al., 2000gas phase; B
Quantity Value Units Method Reference Comment
Deltar5.13kcal/molIMREHiraoka, Nasu, et al., 2000gas phase; B

C6H4FNO2- + Silicon tetrafluoride = C6H4F5NO2Si-

By formula: C6H4FNO2- + F4Si = C6H4F5NO2Si-

Quantity Value Units Method Reference Comment
Deltar12.50 ± 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
Deltar11.70 ± 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
Deltar12.50 ± 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
Deltar13.60 ± 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
Deltar15.20 ± 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
Deltar15.70 ± 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
Deltar7.20 ± 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
Deltar8.20 ± 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
Deltar13.70 ± 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
Deltar11.30 ± 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
Deltar11.70 ± 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
Deltar10.60 ± 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
Deltar10.20 ± 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
Deltar9.60 ± 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
Deltar9.20 ± 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
Deltar7.30 ± 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
Deltar19.80 ± 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
Deltar22.00 ± 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
Deltar10.90 ± 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
Deltar13.90 ± 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
Deltar9.50 ± 0.60kcal/molIMREWilliamson, Knighton, et al., 2001gas phase; at 150 C; B

References

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, 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]

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]


Notes

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, References