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Experimental data for BH2- (boron dihydride anion)

22 02 02 11 45
Other names
BH2 Radical; Borane(2); Boron dihydride;
INChI INChIKey SMILES IUPAC name
InChI=1S/BH2/h1H2 IOCVPZINIZVUIL-UHFFFAOYSA-N [BH2]
State Conformation
2A1 C2V
Enthalpy of formation (Hfg), Entropy, Integrated heat capacity (0 K to 298.15 K) (HH), Heat Capacity (Cp)
Property Value Uncertainty units Reference Comment
Hfg(298.15K) enthalpy of formation 318.29 11.00 kJ mol-1 Gurvich
Hfg(0K) enthalpy of formation 317.98 11.00 kJ mol-1 Gurvich
Entropy (298.15K) entropy 193.55   J K-1 mol-1 Gurvich
Integrated Heat Capacity (0 to 298.15K) integrated heat capacity 10.00   kJ mol-1 Gurvich
Heat Capacity (298.15K) heat capacity 34.72   J K-1 mol-1 Gurvich
Information can also be found for this species in the NIST Chemistry Webbook
Vibrational levels (cm-1) vibrations
Mode Number Symmetry Frequency Intensity Comment Description
Fundamental(cm-1) Harmonic(cm-1) Reference (km mol-1) unc. Reference
2 A1 954   1979HUB/HER      

Calculated vibrational frequencies for BH2- (boron dihydride anion).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
41.64000 7.24800 6.00800 1966Herzberg

Calculated rotational constants for BH2- (boron dihydride anion).
Product of moments of inertia moments of inertia
2.641988amu Å2   4.387185E-40gm cm2
Geometric Data
picture of boron dihydride anion

Point Group C2v


Internal coordinates
distances (r) in Å, angles (a) in degrees, dihedrals (d) in degrees
Description Value unc. Connectivity Reference Comment
Atom 1 Atom 2 Atom 3 Atom 4
rBH 1.180   1 2 1966Herzberg
aHBH 131 2 1 3 1966Herzberg

Cartesians
Atom x (Å) y (Å) z (Å)
B1 0.0000 0.0000 0.0000
H2 0.0000 0.4890 1.0740
H3 0.0000 0.4890 -1.0740

Atom - Atom Distances bond lengths
Distances in Å
  B1 H2 H3
B1   1.18011.1801
H2 1.1801   2.1480
H3 1.18012.1480  

Calculated geometries for BH2- (boron dihydride anion).

Experimental Bond Angles (degrees) from cartesians bond angles

atom1 atom2 atom3 angle
H2 B1 H3 131.040

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
H-B 2

Connectivity
Atom 1 Atom 2
B1 H2
B1 H3
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 1   2A1
5150 0 1966Herzberg

Ionization Energies (eV)
Ionization Energy I.E. unc. vertical I.E. v.I.E. unc. reference
9.800 0.200     webbook
Dipole, Quadrupole and Polarizability
Electric dipole moment dipole
State Config State description Conf description Exp. min. Dipole (Debye) Reference comment Point Group Components
x y z total dipole quadrupole
1 1 2A1 C2v True           C2v 1 2
Experimental dipole measurement abbreviations: MW microwave; DT Dielectric with Temperature variation; DR Indirect (usually an upper limit); MB Molecular beam
Calculated electric dipole moments for BH2- (boron dihydride anion).
Electric quadrupole moment quadrupole
State Config State description Conf description Exp. min. Quadrupole (D Å) Reference comment Point Group Components
xx yy zz dipole quadrupole
1 1 2A1 C2v True       C2v 1 2

Calculated electric quadrupole moments for BH2- (boron dihydride anion).

References
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squib reference DOI
1966Herzberg Herzberg, G., Electronic spectra and electronic structure of polyatomic molecules,Van Nostrand,New York, 1966  
1979HUB/HER Huber, K.P.; Herzberg, G., Molecular Spectra and Molecular Structure. IV. Constants of Diatomic Molecules, Van Nostrand Reinhold Co., 1979 10.1007/978-1-4757-0961-2
Gurvich Gurvich, L.V.; Veyts, I. V.; Alcock, C. B., Thermodynamic Properties of Individual Substances, Fouth Edition, Hemisphere Pub. Co., New York, 1989  
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

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