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 C3H4N2 (1H-Imidazole)

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 CS 1A'
Energy calculated at QCISD/3-21G*
 hartrees
Energy at 0K-224.053519
Energy at 298.15K-224.059517
HF Energy-223.544015
Nuclear repulsion energy160.399551
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' 3595 3455 59.09      
2 A' 3283 3155 1.94      
3 A' 3260 3133 2.68      
4 A' 3256 3129 1.81      
5 A' 1536 1476 20.60      
6 A' 1469 1412 7.24      
7 A' 1408 1353 16.67      
8 A' 1323 1272 8.57      
9 A' 1276 1227 6.62      
10 A' 1162 1117 1.63      
11 A' 1081 1039 3.93      
12 A' 1066 1024 38.64      
13 A' 1026 986 9.97      
14 A' 957 920 2.27      
15 A' 913 878 9.86      
16 A" 869 835 0.88      
17 A" 844 811 24.71      
18 A" 753 723 39.42      
19 A" 675 648 9.05      
20 A" 643 618 17.80      
21 A" 603 579 154.45      

Unscaled Zero Point Vibrational Energy (zpe) 15497.8 cm-1
Scaled (by 0.9611) Zero Point Vibrational Energy (zpe) 14894.9 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
0.31182 0.30440 0.15403

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 1.121 0.000
C2 -1.118 0.296 0.000
C3 1.139 0.291 0.000
N4 -0.756 -0.985 0.000
C5 0.657 -1.006 0.000
H6 0.000 2.133 0.000
H7 -2.131 0.677 0.000
H8 2.145 0.685 0.000
H9 1.217 -1.930 0.000

Atom - Atom Distances (Å)
  N1 C2 C3 N4 C5 H6 H7 H8 H9
N11.38991.40912.23752.22631.01172.17712.18853.2851
C21.38992.25721.33092.20172.15061.08203.28613.2265
C31.40912.25722.28441.38372.16533.29261.08012.2228
N42.23751.33092.28441.41343.20792.15663.34692.1881
C52.22632.20171.38371.41343.20683.25672.25201.0806
H61.01172.15062.16533.20793.20682.58122.58764.2414
H72.17711.08203.29262.15663.25672.58124.27584.2434
H82.18853.28611.08013.34692.25202.58764.27582.7747
H93.28513.22652.22282.18811.08064.24144.24342.7747

picture of 1H-Imidazole state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C2 N4 110.625 N1 C2 H7 122.980
N1 C3 C5 105.716 N1 C3 H8 122.537
C2 N1 C3 107.494 C2 N1 H6 126.422
C2 N4 C5 106.658 C3 N1 H6 126.084
C3 C5 N4 109.507 C3 C5 H9 128.421
N4 C2 H7 126.396 N4 C5 H9 122.072
C5 C3 H8 131.747
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability