return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for HNCNH (diiminomethane)

using model chemistry: MP2/CEP-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2 1A
Energy calculated at MP2/CEP-31G*
 hartrees
Energy at 0K-26.397666
Energy at 298.15K-26.400028
HF Energy-25.969462
Nuclear repulsion energy31.339011
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 MP2/CEP-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A 3597 3415 21.41      
2 A 1229 1167 0.00      
3 A 951 903 3.41      
4 A 756 718 108.08      
5 A 510 484 0.31      
6 B 3599 3417 112.71      
7 B 2186 2075 520.64      
8 B 939 892 469.69      
9 B 514 488 99.59      

Unscaled Zero Point Vibrational Energy (zpe) 7140.9 cm-1
Scaled (by 0.9494) Zero Point Vibrational Energy (zpe) 6779.5 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 MP2/CEP-31G*
ABC
11.30321 0.33195 0.33183

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-31G*

Point Group is C2

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.033
N2 0.000 1.249 -0.089
N3 0.000 -1.249 -0.089
H4 0.647 1.759 0.521
H5 -0.647 -1.759 0.521

Atom - Atom Distances (Å)
  C1 N2 N3 H4 H5
C11.25511.25511.93641.9364
N21.25512.49851.02463.1364
N31.25512.49853.13641.0246
H41.93641.02463.13643.7474
H51.93643.13641.02463.7474

picture of diiminomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 H4 115.925 C1 N3 H5 115.925
N2 C1 N3 168.909
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability