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

using model chemistry: QCISD(TQ)/6-311+G(3df,2p)

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(TQ)/6-311+G(3df,2p)
 hartrees
Energy at 0K-50.627411
Energy at 298.15K-50.627469
HF Energy-50.437343
Nuclear repulsion energy15.341050
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(TQ)/6-311+G(3df,2p)
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 2810 2810 0.00      
2 Σg 1250 1250 0.00      
3 Σu 2770 2770 0.00      
4 Πg 582 582 0.00      
4 Πg 582 582 0.00      
5 Πu 618 618 0.00      
5 Πu 618 618 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 4615.8 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 4615.8 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(TQ)/6-311+G(3df,2p)
B
0.83681

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(TQ)/6-311+G(3df,2p)

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
B1 0.000 0.000 0.757
B2 0.000 0.000 -0.757
H3 0.000 0.000 1.933
H4 0.000 0.000 -1.933

Atom - Atom Distances (Å)
  B1 B2 H3 H4
B11.51381.17602.6898
B21.51382.68981.1760
H31.17602.68983.8658
H42.68981.17603.8658

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