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 (4H-Imidazole)

using model chemistry: CCSD(T)/aug-cc-pVDZ

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)/aug-cc-pVDZ
 hartrees
Energy at 0K-225.634601
Energy at 298.15K-225.640470
HF Energy-224.824062
Nuclear repulsion energy158.750177
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)/aug-cc-pVDZ
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' 3224 3103        
2 A' 3201 3080        
3 A' 3039 2925        
4 A' 1606 1546        
5 A' 1518 1461        
6 A' 1400 1348        
7 A' 1304 1255        
8 A' 1292 1244        
9 A' 1246 1200        
10 A' 1017 979        
11 A' 985 948        
12 A' 938 902        
13 A' 863 831        
14 A' 857 825        
15 A" 3086 2970        
16 A" 1146 1103        
17 A" 980 943        
18 A" 934 899        
19 A" 744 716        
20 A" 545 525        
21 A" 359 345        

Unscaled Zero Point Vibrational Energy (zpe) 15140.8 cm-1
Scaled (by 0.9625) Zero Point Vibrational Energy (zpe) 14573.0 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)/aug-cc-pVDZ
ABC
0.31307 0.28602 0.15386

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)/aug-cc-pVDZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.215 0.364 0.000
C2 0.000 1.149 0.000
N3 1.133 0.508 0.000
C4 0.740 -0.914 0.000
C5 -0.773 -0.865 0.000
H6 -0.070 2.241 0.000
H7 1.150 -1.422 0.894
H8 1.150 -1.422 -0.894
H9 -1.452 -1.726 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.44692.35232.33581.30632.19913.09563.09562.1032
C21.44691.30172.19202.15791.09412.95532.95533.2210
N32.35231.30171.47502.34902.10952.12712.12713.4162
C42.33582.19201.47501.51403.25741.10681.10682.3376
C51.30632.15792.34901.51403.18512.19242.19241.0961
H62.19911.09412.10953.25743.18513.96323.96324.2009
H73.09562.95532.12711.10682.19243.96321.78732.7677
H83.09562.95532.12711.10682.19243.96321.78732.7677
H92.10323.22103.41622.33761.09614.20092.76772.7677

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 117.602 N1 C2 H6 119.218
N1 C5 C4 111.623 N1 C5 H9 121.948
C2 N1 C5 103.093 C2 N3 C4 104.086
N3 C2 H6 123.179 N3 C4 C5 103.595
N3 C4 H7 110.135 N3 C4 H8 110.135
C4 C5 H9 126.430 C5 C4 H7 112.630
C5 C4 H8 112.630 H7 C4 H8 107.690
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability