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

using model chemistry: CISD/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at CISD/3-21G*
 hartrees
Energy at 0K-223.950188
Energy at 298.15K-223.956159
HF Energy-223.510505
Nuclear repulsion energy158.183875
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 CISD/3-21G*
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' 3345 3126 8.83      
2 A' 3307 3090 5.59      
3 A' 3163 2955 0.39      
4 A' 1655 1546 24.75      
5 A' 1587 1483 7.28      
6 A' 1531 1430 11.62      
7 A' 1354 1265 16.96      
8 A' 1340 1252 1.88      
9 A' 1314 1228 11.69      
10 A' 1010 944 43.65      
11 A' 965 902 4.22      
12 A' 910 850 6.00      
13 A' 864 807 12.42      
14 A' 835 780 13.85      
15 A" 3211 3000 0.94      
16 A" 1226 1146 0.03      
17 A" 1061 991 21.43      
18 A" 1004 938 0.01      
19 A" 812 759 10.62      
20 A" 589 551 24.41      
21 A" 397 371 10.26      

Unscaled Zero Point Vibrational Energy (zpe) 15739.0 cm-1
Scaled (by 0.9344) Zero Point Vibrational Energy (zpe) 14706.5 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 CISD/3-21G*
ABC
0.30810 0.28421 0.15211

See section I.F.4 to change rotational constant units
Geometric Data calculated at CISD/3-21G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 1.137 0.556 0.000
C2 0.772 -0.882 0.000
N3 -0.484 -1.143 0.000
C4 -1.178 0.199 0.000
C5 0.000 1.170 0.000
H6 1.557 -1.616 0.000
H7 -1.800 0.283 0.892
H8 -1.800 0.283 -0.892
H9 -0.086 2.244 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.48402.34852.34271.29182.21233.08143.08142.0839
C21.48401.28322.23012.19251.07442.96142.96143.2416
N32.34851.28321.51062.36292.09552.13552.13553.4100
C42.34272.23011.51061.52693.28271.09031.09032.3185
C51.29182.19252.36291.52693.19122.19582.19581.0774
H62.21231.07442.09553.28273.19123.95883.95884.1946
H73.08142.96142.13551.09032.19583.95881.78352.7527
H83.08142.96142.13551.09032.19583.95881.78352.7527
H92.08393.24163.41002.31851.07744.19462.75272.7527

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 115.948 N1 C2 H6 118.831
N1 C5 C4 112.158 N1 C5 H9 122.926
C2 N1 C5 104.129 C2 N3 C4 105.629
N3 C2 H6 125.221 N3 C4 C5 102.136
N3 C4 H7 109.312 N3 C4 H8 109.312
C4 C5 H9 124.916 C5 C4 H7 113.007
C5 C4 H8 113.007 H7 C4 H8 109.741
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability