Dibromosilane


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-45.500kcal/molReviewChase, 1998Data last reviewed in December, 1976
Quantity Value Units Method Reference Comment
gas,1 bar74.101cal/mol*KReviewChase, 1998Data last reviewed in December, 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 1400.1400. to 6000.
A 12.9894024.94931
B 18.302200.443965
C -10.71240-0.082656
D 2.3631600.005362
E -0.168574-2.785990
F -50.66219-59.23291
G 83.8719995.92110
H -45.50000-45.50000
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in December, 1976 Data last reviewed in December, 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.

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
212.3 to 343.74.109761312.752-24.478Stull, 1947Coefficents calculated by NIST from author's data.

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:   C     Symmetry Number σ = 2


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

a1 1 SiH2 s-str 2206  D 2200 S gas 2206 S p liq.
a1 2 SiH2 scis 942  C 942 VS gas 925 W dp liq.
a1 3 SiBr2 s-str 407  C 407 M gas 393 S p liq.
a1 4 SiBr2 scis 122  D 122 M p liq.
a2 5 SiH2 twist 688  D  ia 688 W dp liq.
b1 6 SiH2 a-str 2232  D 2200 S gas 2232 W dp liq.
b1 7 SiH2 rock 556  C 556 S gas
b2 8 SiH2 wag 843  C 843 VS gas 828 VW dp liq.
b2 9 SiBr2 a-str 471  C 471 S gas 456 W dp liq.

Source: Shimanouchi, 1972

Notes

VSVery strong
SStrong
MMedium
WWeak
VWVery weak
iaInactive
pPolarized
dpDepolarized
C3~6 cm-1 uncertainty
D6~15 cm-1 uncertainty

References

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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]

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]

Shimanouchi, 1972
Shimanouchi, T., Tables of Molecular Vibrational Frequencies Consolidated Volume II, J. Phys. Chem. Ref. Data, 1972, 6, 3, 993-1102. [all data]


Notes

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