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

using model chemistry: CCSD/6-31G(2df,p)

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/6-31G(2df,p)
 hartrees
Energy at 0K-225.672264
Energy at 298.15K-225.678229
HF Energy-224.818838
Nuclear repulsion energy160.620352
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/6-31G(2df,p)
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' 3269 3091 9.93      
2 A' 3248 3071 6.16      
3 A' 3101 2932 2.15      
4 A' 1691 1599 37.32      
5 A' 1608 1521 11.44      
6 A' 1452 1373 11.73      
7 A' 1350 1277 24.67      
8 A' 1335 1263 7.94      
9 A' 1295 1224 3.94      
10 A' 1054 996 55.19      
11 A' 1023 967 10.14      
12 A' 961 909 2.33      
13 A' 891 842 4.31      
14 A' 883 835 13.39      
15 A" 3144 2973 1.35      
16 A" 1190 1125 0.43      
17 A" 1030 974 11.33      
18 A" 985 931 0.79      
19 A" 776 734 3.88      
20 A" 566 535 22.19      
21 A" 373 353 5.21      

Unscaled Zero Point Vibrational Energy (zpe) 15613.0 cm-1
Scaled (by 0.9455) Zero Point Vibrational Energy (zpe) 14762.1 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/6-31G(2df,p)
ABC
0.32103 0.29199 0.15739

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD/6-31G(2df,p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.204 0.354 0.000
C2 0.000 1.134 0.000
N3 1.117 0.509 0.000
C4 0.737 -0.901 0.000
C5 -0.765 -0.854 0.000
H6 -0.078 2.214 0.000
H7 1.143 -1.407 0.882
H8 1.143 -1.407 -0.882
H9 -1.429 -1.711 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.43502.32572.31131.28522.17443.06353.06352.0768
C21.43501.27992.16482.13081.08222.92262.92263.1839
N32.32571.27991.46002.32352.08172.10902.10903.3773
C42.31132.16481.46001.50303.21961.09461.09462.3125
C51.28522.13082.32351.50303.14412.17342.17341.0836
H62.17441.08222.08173.21963.14413.92133.92134.1506
H73.06352.92262.10901.09462.17343.92131.76392.7357
H83.06352.92262.10901.09462.17343.92131.76392.7357
H92.07683.18393.37732.31251.08364.15062.73572.7357

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 117.778 N1 C2 H6 118.830
N1 C5 C4 111.746 N1 C5 H9 122.262
C2 N1 C5 102.994 C2 N3 C4 104.199
N3 C2 H6 123.392 N3 C4 C5 103.283
N3 C4 H7 110.480 N3 C4 H8 110.480
C4 C5 H9 125.992 C5 C4 H7 112.632
C5 C4 H8 112.632 H7 C4 H8 107.351
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability