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: QCISD(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 QCISD(T)=FULL/6-31G*
 hartrees
Energy at 0K-225.593413
Energy at 298.15K-225.599272
HF Energy-224.810814
Nuclear repulsion energy162.512512
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 QCISD(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' 3651 3651        
2 A' 3289 3289        
3 A' 3264 3264        
4 A' 3259 3259        
5 A' 1579 1579        
6 A' 1533 1533        
7 A' 1473 1473        
8 A' 1387 1387        
9 A' 1296 1296        
10 A' 1170 1170        
11 A' 1165 1165        
12 A' 1117 1117        
13 A' 1090 1090        
14 A' 941 941        
15 A' 904 904        
16 A" 816 816        
17 A" 790 790        
18 A" 693 693        
19 A" 672 672        
20 A" 627 627        
21 A" 474 474        

Unscaled Zero Point Vibrational Energy (zpe) 15596.0 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 15596.0 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 QCISD(T)=FULL/6-31G*
ABC
0.32340 0.31019 0.15833

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 1.109 0.000
C2 -1.092 0.283 0.000
C3 1.124 0.302 0.000
N4 -0.748 -0.992 0.000
C5 0.639 -0.984 0.000
H6 -0.011 2.121 0.000
H7 -2.108 0.664 0.000
H8 2.127 0.709 0.000
H9 1.203 -1.910 0.000

Atom - Atom Distances (Å)
  N1 C2 C3 N4 C5 H6 H7 H8 H9
N11.36901.38342.23012.18811.01282.15422.16433.2498
C21.36902.21581.32092.14502.13261.08503.24723.1747
C31.38342.21582.27551.37442.14463.25191.08292.2134
N42.23011.32092.27551.38663.19972.14333.34082.1563
C52.18812.14501.37441.38663.17283.20322.25451.0846
H61.01282.13262.14463.19973.17282.55332.56264.2106
H72.15421.08503.25192.14333.20322.55334.23524.1942
H82.16433.24721.08293.34082.25452.56264.23522.7775
H93.24983.17472.21342.15631.08464.21064.19422.7775

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 111.995 N1 C2 H7 122.334
N1 C3 C5 105.012 N1 C3 H8 122.225
C2 N1 C3 107.227 C2 N1 H6 126.458
C2 N4 C5 104.761 C3 N1 H6 126.314
C3 C5 N4 111.005 C3 C5 H9 127.961
N4 C2 H7 125.671 N4 C5 H9 121.034
C5 C3 H8 132.763
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability