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All results from a given calculation for HNCNH (diiminomethane)

using model chemistry: QCISD/6-31G(2df,p)

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/6-31G(2df,p)
 hartrees
Energy at 0K-148.453886
Energy at 298.15K-148.456330
HF Energy-147.916878
Nuclear repulsion energy60.054596
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/6-31G(2df,p)
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A 3658 3466 27.83      
2 A 1278 1211 0.00      
3 A 960 909 9.34      
4 A 785 744 92.43      
5 A 545 516 0.00      
6 B 3658 3465 117.69      
7 B 2240 2122 547.41      
8 B 951 901 452.26      
9 B 549 520 82.55      

Unscaled Zero Point Vibrational Energy (zpe) 7311.8 cm-1
Scaled (by 0.9474) Zero Point Vibrational Energy (zpe) 6927.2 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/6-31G(2df,p)
ABC
12.00540 0.34605 0.34596

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/6-31G(2df,p)

Point Group is C2

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.014
N2 0.000 1.223 -0.080
N3 0.000 -1.223 -0.080
H4 0.635 1.734 0.518
H5 -0.635 -1.734 0.518

Atom - Atom Distances (Å)
  C1 N2 N3 H4 H5
C11.22611.22611.91381.9138
N21.22612.44501.01073.0821
N31.22612.44503.08211.0107
H41.91381.01073.08213.6926
H51.91383.08211.01073.6926

picture of diiminomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 H4 117.332 C1 N3 H5 117.332
N2 C1 N3 171.230
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability