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Difluorooxosilane


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
Deltafgas-966.50kJ/molReviewChase, 1998Data last reviewed in September, 1963
Quantity Value Units Method Reference Comment
gas,1 bar271.24J/mol*KReviewChase, 1998Data last reviewed in September, 1963

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.

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Temperature (K) 298. - 1100.1100. - 6000.
A 32.4052582.26748
B 112.81570.488829
C -97.95372-0.098780
D 30.697000.006834
E -0.397988-5.118915
F -981.7128-1005.076
G 278.6649349.9360
H -966.5040-966.5040
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in September, 1963 Data last reviewed in September, 1963

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 + Difluorooxosilane = (Fluorine anion bullet Difluorooxosilane)

By formula: F- + F2OSi = (F- bullet F2OSi)

Quantity Value Units Method Reference Comment
Deltar516.31kJ/molTherDamrauer, Simon, et al., 1991gas phase; Between HCO2H, HCl; B
Deltar427. ± 71.kJ/molIMRBLarson and McMahon, 1987gas 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

Ion clustering 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. Searches may be limited to ion clustering reactions. A general reaction search form is also available.

Clustering reactions

Fluorine anion + Difluorooxosilane = (Fluorine anion bullet Difluorooxosilane)

By formula: F- + F2OSi = (F- bullet F2OSi)

Quantity Value Units Method Reference Comment
Deltar516.31kJ/molTherDamrauer, Simon, et al., 1991gas phase; Between HCO2H, HCl; B
Deltar427. ± 71.kJ/molIMRBLarson and McMahon, 1987gas 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

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: Marilyn E. Jacox

State:   X


Vib. 
sym. 
 No.   Approximate 
 type of mode 
 cm-1   Med.   Method   References

a1 1 Si=O stretch 1309 vs Ar IR Schnockel, 1980
2 SiF s-stretch 835 m Ar IR Schnockel, 1980
3 SiF2 deform. 423 w m Ar IR Schnockel, 1980
b1 4 OPLA 344 s Ar IR Schnockel, 1980
b2 5 SiF a-stretch 996 s Ar IR Schnockel, 1980
6 SiF2 rock 333 m Ar IR Schnockel, 1980

Additional references: Jacox, 1994, page 211

Notes

wWeak
mMedium
sStrong
vsVery strong

References

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Ion clustering data, 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.

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

Damrauer, Simon, et al., 1991
Damrauer, R.; Simon, R.; Krempp, M., Effect of Substituents on the Gas-Phase Acidity of Silanols, J. Am. Chem. Soc., 1991, 113, 12, 4431, https://doi.org/10.1021/ja00012a009 . [all data]

Larson and McMahon, 1987
Larson, J.W.; McMahon, T.B., Trends in Gas Phase Fluoride Ion Affinities of the Main Group Oxyfluorides and Fluoride Sulfides. Fluoride Adducts of FAsO, FPO, FPO2, F2SiO, F4SO, FBO, F2SiS, FPS, FAsS, F2S2, and S2O., Inorg. Chem., 1987, 26, 24, 4018, https://doi.org/10.1021/ic00271a011 . [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]

Schnockel, 1980
Schnockel, H., Matrixreaktion von SiO mit F2. IR-spektroskopischer nachweis von molekularem OSiF2, J. Mol. Struct., 1980, 65, 115, https://doi.org/10.1016/0022-2860(80)85184-2 . [all data]

Jacox, 1994
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules, American Chemical Society, Washington, DC, 1994, 464. [all data]


Notes

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