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: MP2/CEP-31G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2/CEP-31G
 hartrees
Energy at 0K-38.453566
Energy at 298.15K-38.459437
HF Energy-38.015883
Nuclear repulsion energy81.980313
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' 3683 3559 60.05      
2 A' 3292 3181 3.27      
3 A' 3282 3171 10.66      
4 A' 3259 3149 4.08      
5 A' 1508 1457 16.80      
6 A' 1442 1394 12.17      
7 A' 1401 1353 20.15      
8 A' 1310 1266 6.35      
9 A' 1234 1192 3.93      
10 A' 1154 1115 0.66      
11 A' 1093 1056 15.40      
12 A' 1080 1044 15.66      
13 A' 1035 1000 33.44      
14 A' 918 887 5.54      
15 A' 881 852 5.60      
16 A" 786 759 22.67      
17 A" 762 736 93.69      
18 A" 685 662 50.43      
19 A" 658 636 6.59      
20 A" 636 615 78.89      
21 A" 587 567 48.44      

Unscaled Zero Point Vibrational Energy (zpe) 15342.6 cm-1
Scaled (by 0.9663) Zero Point Vibrational Energy (zpe) 14825.6 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 MP2/CEP-31G
ABC
0.30412 0.29181 0.14892

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 1.141 0.000
C2 -1.132 0.298 0.000
C3 1.159 0.319 0.000
N4 -0.768 -1.026 0.000
C5 0.664 -1.019 0.000
H6 -0.007 2.161 0.000
H7 -2.158 0.672 0.000
H8 2.169 0.731 0.000
H9 1.227 -1.954 0.000

Atom - Atom Distances (Å)
  N1 C2 C3 N4 C5 H6 H7 H8 H9
N11.41171.42132.29912.26011.01932.20802.20753.3299
C21.41172.29111.37242.22662.17641.09183.32943.2614
C31.42132.29112.34981.42682.17993.33541.09112.2739
N42.29911.37242.34981.43173.27602.19373.42272.2009
C52.26012.22661.42681.43173.24973.28922.30901.0918
H61.01932.17642.17993.27603.24972.61572.60334.2959
H72.20801.09183.33542.19373.28922.61574.32714.2841
H82.20753.32941.09113.42272.30902.60334.32712.8459
H93.32993.26142.27392.20091.09184.29594.28412.8459

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 111.329 N1 C2 H7 123.252
N1 C3 C5 105.039 N1 C3 H8 122.416
C2 N1 C3 107.939 C2 N1 H6 126.315
C2 N4 C5 105.111 C3 N1 H6 125.746
C3 C5 N4 110.582 C3 C5 H9 128.587
N4 C2 H7 125.419 N4 C5 H9 120.832
C5 C3 H8 132.545
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability