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Dibromosilylene


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-12.50kcal/molReviewChase, 1998Data last reviewed in December, 1977
Quantity Value Units Method Reference Comment
gas,1 bar72.942cal/mol*KReviewChase, 1998Data last reviewed in December, 1977

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. - 6000.
A 13.91660
B -0.027115
C -0.006987
D 0.007117
E -0.099080
F -16.98070
G 89.23470
H -12.50000
ReferenceChase, 1998
Comment Data last reviewed in December, 1977

Gas phase ion energetics 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:
LL - Sharon G. Lias and Joel F. Liebman
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
B - John E. Bartmess

View reactions leading to Br2Si+ (ion structure unspecified)

Electron affinity determinations

EA (eV) Method Reference Comment
>1.7EIAEPabst, Margrave, et al., 1977From SiBr4; G2MP2 calculations indicate an EA of ca. 1.3 eV; B

Ionization energy determinations

IE (eV) Method Reference Comment
~8.5DERCreasey, Lambert, et al., 1991LL
12. ± 1.EIFarber and Srivastava, 1980LLK

Vibrational and/or electronic energy levels

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics 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 by: Marilyn E. Jacox

State:   A ?


 Energy 
 (cm-1
 Med.   Transition   «lambda»min 
 (nm) 
 «lambda»max 
 (nm) 
 References

Tx = 27600 gas A-X 340 400 Ruzsicska, Jodhan, et al., 1987

State:   X


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

a1 1 Sym. stretch 402.6 s Ar IR Maass, Hauge, et al., 1972
b2 3 Asym. stretch 399.5 vs Ar IR Maass, Hauge, et al., 1972

Additional references: Jacox, 1994, page 101

Notes

sStrong
vsVery strong
xEnergy separation between the band maximum of the excited electronic state and the v = 0 level of the ground state.

References

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics 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]

Pabst, Margrave, et al., 1977
Pabst, R.E.; Margrave, J.L.; Franklin, J.L., Electron impact studies of the tetrachlorides and tetrabromides of silicon and germanium, Int. J. Mass Spectrom. Ion Phys., 1977, 25, 361. [all data]

Creasey, Lambert, et al., 1991
Creasey, J.C.; Lambert, I.R.; Tuckett, R.P.; Codling, K.; Leszek, J.F.; Hatherly, P.A.; Stankiewicz, M., Photoionization mass-spectrometric study of fragmentation of SiBr4 and GeBr4 in the range 400-1220 A, J. Chem. Soc. Faraday Trans., 1991, 87, 3717. [all data]

Farber and Srivastava, 1980
Farber, M.; Srivastava, R.D., Mass spectrometric determination of the heats of formation of the silicon bromides SiBr(g), SiBr2(g), and SiBr3(g)., High Temp. Sci., 1980, 12, 21. [all data]

Ruzsicska, Jodhan, et al., 1987
Ruzsicska, B.; Jodhan, A.; Safarik, I.; Strausz, O.P.; Bell, T.N., Flash photolysis of SiBr4: the UV spectrum of SiBr2, Chem. Phys. Lett., 1987, 139, 1, 72, https://doi.org/10.1016/0009-2614(87)80153-7 . [all data]

Maass, Hauge, et al., 1972
Maass, G.; Hauge, R.H.; Margrave, J.L., The I.R. Spectra of Matrix-isolated SiBr2 and SiCl2, Z. Anorg. Allg. Chem., 1972, 392, 3, 295, https://doi.org/10.1002/zaac.19723920314 . [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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