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All results from a given calculation for C3H4N2 (2H-Imidazole)

using model chemistry: QCISD/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at QCISD/6-31G*
 hartrees
Energy at 0K-225.447682
Energy at 298.15K-225.453675
HF Energy-224.723390
Nuclear repulsion energy166.254693
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*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 3270 3114 11.84      
2 A1 3104 2956 0.88      
3 A1 1759 1675 25.16      
4 A1 1484 1413 5.69      
5 A1 1432 1364 9.69      
6 A1 1282 1221 4.05      
7 A1 1058 1008 1.60      
8 A1 951 905 14.55      
9 A2 1174 1118 0.00      
10 A2 880 838 0.00      
11 A2 537 512 0.00      
12 B1 3151 3001 0.61      
13 B1 1045 996 20.22      
14 B1 821 782 7.63      
15 B1 356 339 38.92      
16 B2 3255 3100 8.80      
17 B2 1814 1728 0.06      
18 B2 1442 1373 31.25      
19 B2 1271 1210 2.22      
20 B2 1104 1051 33.00      
21 B2 945 900 66.90      

Unscaled Zero Point Vibrational Energy (zpe) 16068.0 cm-1
Scaled (by 0.9523) Zero Point Vibrational Energy (zpe) 15301.6 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/6-31G*
ABC
0.36140 0.30149 0.16975

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/6-31G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.209
N2 0.000 0.997 0.282
N3 0.000 -0.997 0.282
C4 0.000 0.729 -0.950
C5 0.000 -0.729 -0.950
H6 -0.898 0.000 1.837
H7 0.898 0.000 1.837
H8 0.000 1.479 -1.735
H9 0.000 -1.479 -1.735

Atom - Atom Distances (Å)
  C1 N2 N3 C4 C5 H6 H7 H8 H9
C11.36191.36192.27872.27871.09611.09613.29413.2941
N21.36191.99471.26052.12062.05462.05462.07283.1932
N31.36191.99472.12061.26052.05462.05463.19322.0728
C42.27871.26052.12061.45793.01773.01771.08532.3430
C52.27872.12061.26051.45793.01773.01772.34301.0853
H61.09612.05462.05463.01773.01771.79653.96883.9688
H71.09612.05462.05463.01773.01771.79653.96883.9688
H83.29412.07283.19321.08532.34303.96883.96882.9576
H93.29413.19322.07282.34301.08533.96883.96882.9576

picture of 2H-Imidazole state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 C4 120.624 C1 N3 C5 120.624
N2 C1 N3 94.163 N2 C1 H6 112.971
N2 C1 H7 112.971 N2 C4 C5 102.295
N2 C4 H8 124.002 N3 C1 H6 112.971
N3 C1 H7 112.971 N3 C5 C4 102.295
N3 C5 H9 124.002 C4 C5 H9 133.704
C5 C4 H8 133.704 H6 C1 H7 110.064
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability