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All results from a given calculation for C3H4N2 (4H-Imidazole)

using model chemistry: CCSD(T)=FULL/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at CCSD(T)=FULL/6-31G*
 hartrees
Energy at 0K-222.348897
Energy at 298.15K-222.354761
HF Energy-221.960220
Nuclear repulsion energy153.743222
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 CCSD(T)=FULL/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 A' 3422 3322        
2 A' 3418 3318        
3 A' 3291 3195        
4 A' 1625 1578        
5 A' 1601 1554        
6 A' 1520 1476        
7 A' 1387 1346        
8 A' 1330 1291        
9 A' 1292 1254        
10 A' 1025 995        
11 A' 1005 975        
12 A' 983 955        
13 A' 875 849        
14 A' 849 824        
15 A" 3394 3295        
16 A" 1214 1178        
17 A" 1009 979        
18 A" 892 866        
19 A" 769 747        
20 A" 531 516        
21 A" 358 348        

Unscaled Zero Point Vibrational Energy (zpe) 15895.6 cm-1
Scaled (by 0.9707) Zero Point Vibrational Energy (zpe) 15429.9 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 CCSD(T)=FULL/6-31G*
ABC
0.29577 0.26531 0.14382

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)=FULL/6-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.278 0.363 0.000
C2 0.000 1.181 0.000
N3 1.179 0.540 0.000
C4 0.763 -0.947 0.000
C5 -0.787 -0.889 0.000
H6 -0.078 2.290 0.000
H7 1.178 -1.450 0.908
H8 1.178 -1.450 -0.908
H9 -1.446 -1.782 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.51742.46352.42511.34392.27043.18433.18432.1511
C21.51741.34212.26092.21421.11153.02233.02233.2972
N32.46351.34211.54452.43082.15422.18762.18763.5053
C42.42512.26091.54451.55163.34441.11781.11782.3622
C51.34392.21422.43081.55163.25662.23642.23641.1103
H62.27041.11152.15423.34443.25664.04804.04804.2956
H73.18433.02232.18761.11782.23644.04801.81622.7969
H83.18433.02232.18761.11782.23644.04801.81622.7969
H92.15113.29723.50532.36221.11034.29562.79692.7969

picture of 4H-Imidazole state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C2 N3 118.842 N1 C2 H6 118.640
N1 C5 C4 113.574 N1 C5 H9 122.159
C2 N1 C5 101.231 C2 N3 C4 102.891
N3 C2 H6 122.517 N3 C4 C5 103.461
N3 C4 H7 109.468 N3 C4 H8 109.468
C4 C5 H9 124.267 C5 C4 H7 112.809
C5 C4 H8 112.809 H7 C4 H8 108.673
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability