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Boron dihydride


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
Deltafgas200.83kJ/molReviewChase, 1998Data last reviewed in December, 1964
Quantity Value Units Method Reference Comment
gas,1 bar180.19J/mol*KReviewChase, 1998Data last reviewed in December, 1964

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. - 1300.1300. - 6000.
A 27.9660755.96728
B 29.190603.264763
C -6.409428-0.617010
D -0.6593480.040532
E -0.183321-9.779724
F 190.6389164.0161
G 204.5913222.6980
H 200.8320200.8320
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in December, 1964 Data last reviewed in December, 1964

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 by: John E. Bartmess

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

HB- + Hydrogen cation = H2B

By formula: HB- + H+ = H2B

Quantity Value Units Method Reference Comment
Deltar1629. ± 28.kJ/molD-EAReid, 1993gas phase

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:
B - John E. Bartmess
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to BH2+ (ion structure unspecified)

Ionization energy determinations

IE (eV) Method Reference Comment
9.8 ± 0.2EIFehlner and Koski, 1964RDSH

De-protonation reactions

HB- + Hydrogen cation = H2B

By formula: HB- + H+ = H2B

Quantity Value Units Method Reference Comment
Deltar1629. ± 28.kJ/molD-EAReid, 1993gas phase; B

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:   A


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

To = 4194.1 gas A-X 640 870 Herzberg and Johns, 1967


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

a1 2 Bend 953.6 gas AB Herzberg and Johns, 1967

Additional references: Jacox, 1994, page 17

Notes

oEnergy separation between the v = 0 levels of the excited and electronic ground states.

References

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Vibrational and/or electronic energy levels, NIST Free Links, 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]

Reid, 1993
Reid, C.J., Electron Affinities of BH, B2, BC, and BN molecules determined using Charge Inversion Spectrometry, Int. J. Mass Spectrom. Ion Proc., 1993, 127, 147, https://doi.org/10.1016/0168-1176(93)87087-9 . [all data]

Fehlner and Koski, 1964
Fehlner, T.P.; Koski, W.S., Direct detection of the borane molecule and the boryl radical by mass spectrometry, J. Am. Chem. Soc., 1964, 86, 2733. [all data]

Herzberg and Johns, 1967
Herzberg, G.; Johns, J.W.C., The Spectrum and Structure of the Free BHFormula Radical, Proc. Roy. Soc. (London) A298, 1967, 298, 1453, 142, https://doi.org/10.1098/rspa.1967.0096 . [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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