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All results from a given calculation for HNCNH (diiminomethane)

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 C2 1A
Energy calculated at QCISD/3-21G*
 hartrees
Energy at 0K-147.374428
Energy at 298.15K-147.376761
HF Energy-147.051622
Nuclear repulsion energy59.451490
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 A 3518 3381 12.01      
2 A 1251 1202 0.40      
3 A 888 853 13.71      
4 A 783 753 130.06      
5 A 497 478 1.13      
6 B 3521 3384 83.29      
7 B 2220 2134 358.46      
8 B 882 847 682.99      
9 B 500 481 67.59      

Unscaled Zero Point Vibrational Energy (zpe) 7029.8 cm-1
Scaled (by 0.9611) Zero Point Vibrational Energy (zpe) 6756.4 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*
ABC
13.89574 0.33723 0.33706

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

Point Group is C2

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.029
N2 0.000 1.230 -0.078
N3 0.000 -1.230 -0.078
H4 0.599 1.854 0.462
H5 -0.599 -1.854 0.462

Atom - Atom Distances (Å)
  C1 N2 N3 H4 H5
C11.23461.23461.99561.9956
N21.23462.45991.01983.1874
N31.23462.45993.18741.0198
H41.99561.01983.18743.8959
H51.99563.18741.01983.8959

picture of diiminomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 H4 124.272 C1 N3 H5 124.272
N2 C1 N3 170.009
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability