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: 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-225.655832
Energy at 298.15K-225.661720
HF Energy-224.843593
Nuclear repulsion energy161.403540
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' 3658 3521        
2 A' 3281 3158        
3 A' 3258 3135        
4 A' 3253 3131        
5 A' 1539 1481        
6 A' 1492 1436        
7 A' 1441 1387        
8 A' 1349 1299        
9 A' 1259 1212        
10 A' 1140 1097        
11 A' 1132 1090        
12 A' 1085 1044        
13 A' 1060 1020        
14 A' 924 889        
15 A' 887 853        
16 A" 830 799        
17 A" 799 769        
18 A" 706 680        
19 A" 661 636        
20 A" 623 600        
21 A" 491 472        

Unscaled Zero Point Vibrational Energy (zpe) 15433.2 cm-1
Scaled (by 0.9625) Zero Point Vibrational Energy (zpe) 14854.5 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 CCSD(T)/aug-cc-pVDZ
ABC
0.31874 0.30601 0.15612

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 0.000 1.116 0.000
C2 -1.100 0.286 0.000
C3 1.132 0.306 0.000
N4 -0.753 -0.998 0.000
C5 0.643 -0.994 0.000
H6 -0.014 2.128 0.000
H7 -2.120 0.671 0.000
H8 2.142 0.714 0.000
H9 1.213 -1.923 0.000

Atom - Atom Distances (Å)
  N1 C2 C3 N4 C5 H6 H7 H8 H9
N11.37751.39182.24432.20561.01282.16622.17883.2723
C21.37752.23171.33102.16262.13831.09033.26953.1991
C31.39182.23172.29181.38872.15293.27231.08932.2305
N42.24431.33102.29181.39563.21312.15813.36312.1728
C52.20562.16261.38871.39563.19093.22592.27251.0904
H61.01282.13832.15293.21313.19092.56122.57804.2336
H72.16621.09033.27232.15813.22592.56124.26184.2242
H82.17883.26951.08933.36312.27252.57804.26182.7960
H93.27233.19912.23052.17281.09044.23364.22422.7960

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 111.899 N1 C2 H7 122.320
N1 C3 C5 104.980 N1 C3 H8 122.380
C2 N1 C3 107.390 C2 N1 H6 126.229
C2 N4 C5 104.937 C3 N1 H6 126.382
C3 C5 N4 110.794 C3 C5 H9 127.832
N4 C2 H7 125.781 N4 C5 H9 121.373
C5 C3 H8 132.639
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability