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: MP2/6-31+G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2/6-31+G**
 hartrees
Energy at 0K-225.568463
Energy at 298.15K-225.574320
HF Energy-224.829548
Nuclear repulsion energy162.729324
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 MP2/6-31+G**
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' 3724 3503 77.26      
2 A' 3360 3161 0.82      
3 A' 3342 3143 0.84      
4 A' 3335 3137 2.62      
5 A' 1561 1468 6.43      
6 A' 1525 1434 26.31      
7 A' 1487 1398 19.40      
8 A' 1395 1312 8.50      
9 A' 1297 1220 1.12      
10 A' 1191 1121 2.79      
11 A' 1169 1100 3.80      
12 A' 1122 1055 26.28      
13 A' 1098 1032 29.72      
14 A' 938 883 2.50      
15 A' 899 846 4.75      
16 A" 808 760 29.79      
17 A" 762 716 61.27      
18 A" 687 646 23.11      
19 A" 666 627 0.08      
20 A" 615 579 34.27      
21 A" 475 447 74.14      

Unscaled Zero Point Vibrational Energy (zpe) 15727.7 cm-1
Scaled (by 0.9406) Zero Point Vibrational Energy (zpe) 14793.5 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 MP2/6-31+G**
ABC
0.32441 0.31066 0.15869

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31+G**

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 1.106 0.000
C2 -1.094 0.285 0.000
C3 1.121 0.306 0.000
N4 -0.741 -0.994 0.000
C5 0.637 -0.986 0.000
H6 -0.012 2.114 0.000
H7 -2.103 0.663 0.000
H8 2.118 0.712 0.000
H9 1.202 -1.903 0.000

Atom - Atom Distances (Å)
  N1 C2 C3 N4 C5 H6 H7 H8 H9
N11.36771.37692.22722.18691.00822.14892.15413.2400
C21.36772.21521.32722.14772.12491.07713.24003.1718
C31.37692.21522.27141.38022.13363.24341.07602.2105
N42.22721.32722.27141.37813.19272.14493.32932.1454
C52.18692.14771.38021.37813.16753.19772.25301.0769
H61.00822.12492.13363.19273.16752.54472.55024.1964
H72.14891.07713.24342.14493.19772.54474.22074.1841
H82.15413.24001.07603.32932.25302.55024.22072.7701
H93.24003.17182.21052.14541.07694.19644.18412.7701

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 111.456 N1 C2 H7 122.586
N1 C3 C5 104.967 N1 C3 H8 122.366
C2 N1 C3 107.625 C2 N1 H6 126.177
C2 N4 C5 105.082 C3 N1 H6 126.198
C3 C5 N4 110.870 C3 C5 H9 127.792
N4 C2 H7 125.958 N4 C5 H9 121.337
C5 C3 H8 132.668
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability