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All results from a given calculation for HBBH (Diborane(2))

using model chemistry: QCISD/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D*H 3ΣG
Energy calculated at QCISD/3-21G*
 hartrees
Energy at 0K-50.236727
Energy at 298.15K-50.236421
HF Energy-50.135676
Nuclear repulsion energy15.195458
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at QCISD/3-21G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Σg 2812 2703 0.00      
2 Σg 1254 1205 0.00      
3 Σu 2764 2656 34.54      
4 Πg 381 366 0.00      
4 Πg 381 366 0.00      
5 Πu 593 570 2.28      
5 Πu 593 570 2.28      

Unscaled Zero Point Vibrational Energy (zpe) 4388.3 cm-1
Scaled (by 0.9611) Zero Point Vibrational Energy (zpe) 4217.6 cm-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.
Rotational Constants (cm-1) from geometry optimized at QCISD/3-21G*
B
0.82004

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/3-21G*

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
B1 0.000 0.000 0.765
B2 0.000 0.000 -0.765
H3 0.000 0.000 1.950
H4 0.000 0.000 -1.950

Atom - Atom Distances (Å)
  B1 B2 H3 H4
B11.53041.18482.7152
B21.53042.71521.1848
H31.18482.71523.9000
H42.71521.18483.9000

picture of Diborane(2) state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
B1 B2 H4 180.000 B2 B1 H3 180.000
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability