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All results from a given calculation for C3H4N2 (1H-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-223.981482
Energy at 298.15K-223.987638
HF Energy-223.547406
Nuclear repulsion energy161.812996
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' 3706 3463 78.58      
2 A' 3380 3158 1.50      
3 A' 3354 3134 1.37      
4 A' 3352 3132 2.49      
5 A' 1595 1491 21.95      
6 A' 1525 1425 9.00      
7 A' 1460 1364 18.98      
8 A' 1373 1283 11.43      
9 A' 1327 1240 3.94      
10 A' 1200 1122 1.29      
11 A' 1122 1048 4.39      
12 A' 1109 1036 36.07      
13 A' 1075 1004 19.60      
14 A' 993 928 2.33      
15 A' 952 889 10.77      
16 A" 934 873 0.90      
17 A" 900 841 18.73      
18 A" 806 753 40.32      
19 A" 703 657 10.44      
20 A" 674 630 60.80      
21 A" 654 611 130.66      

Unscaled Zero Point Vibrational Energy (zpe) 16096.1 cm-1
Scaled (by 0.9344) Zero Point Vibrational Energy (zpe) 15040.2 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
0.31669 0.31053 0.15679

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 0.000 1.115 0.000
C2 -1.107 0.287 0.000
C3 1.128 0.293 0.000
N4 -0.755 -0.987 0.000
C5 0.655 -0.990 0.000
H6 -0.001 2.121 0.000
H7 -2.112 0.663 0.000
H8 2.127 0.686 0.000
H9 1.210 -1.908 0.000

Atom - Atom Distances (Å)
  N1 C2 C3 N4 C5 H6 H7 H8 H9
N11.38231.39602.23302.20491.00542.16012.16963.2562
C21.38232.23521.32142.17592.14121.07343.25823.1915
C31.39602.23522.27661.36822.14813.26171.07312.2026
N42.23301.32142.27661.40923.19722.13633.33182.1699
C52.20492.17591.36821.40923.17923.22322.23141.0725
H61.00542.14122.14813.19723.17922.56582.56584.2065
H72.16011.07343.26172.13633.22322.56584.23924.2008
H82.16963.25821.07313.33182.23142.56584.23922.7516
H93.25623.19152.20262.16991.07254.20654.20082.7516

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 111.342 N1 C2 H7 122.703
N1 C3 C5 105.814 N1 C3 H8 122.428
C2 N1 C3 107.125 C2 N1 H6 126.758
C2 N4 C5 105.618 C3 N1 H6 126.117
C3 C5 N4 110.101 C3 C5 H9 128.556
N4 C2 H7 125.955 N4 C5 H9 121.344
C5 C3 H8 131.757
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability