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 (2H-Imidazole)

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

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at CCSD=FULL/6-31G(2df,p)
 hartrees
Energy at 0K-225.642055
Energy at 298.15K-225.648126
HF Energy-224.748703
Nuclear repulsion energy167.086928
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=FULL/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 A1 3297 3105 9.34      
2 A1 3134 2951 0.36      
3 A1 1762 1659 25.00      
4 A1 1461 1376 4.86      
5 A1 1423 1340 12.20      
6 A1 1275 1201 3.04      
7 A1 1058 996 1.46      
8 A1 953 897 14.92      
9 A2 1200 1130 0.00      
10 A2 952 897 0.00      
11 A2 560 527 0.00      
12 B1 3183 2998 0.01      
13 B1 1046 985 19.30      
14 B1 850 800 3.62      
15 B1 368 346 35.47      
16 B2 3282 3090 4.82      
17 B2 1820 1713 0.24      
18 B2 1431 1348 30.23      
19 B2 1274 1200 2.42      
20 B2 1105 1041 30.64      
21 B2 951 896 67.01      

Unscaled Zero Point Vibrational Energy (zpe) 16192.5 cm-1
Scaled (by 0.9416) Zero Point Vibrational Energy (zpe) 15246.8 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=FULL/6-31G(2df,p)
ABC
0.36265 0.30605 0.17140

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.200
N2 0.000 0.997 0.279
N3 0.000 -0.997 0.279
C4 0.000 0.728 -0.942
C5 0.000 -0.728 -0.942
H6 -0.893 0.000 1.824
H7 0.893 0.000 1.824
H8 0.000 1.467 -1.727
H9 0.000 -1.467 -1.727

Atom - Atom Distances (Å)
  C1 N2 N3 C4 C5 H6 H7 H8 H9
C11.35731.35732.26222.26221.08961.08963.27443.2744
N21.35731.99381.25022.11302.04422.04422.06073.1772
N31.35731.99382.11301.25022.04422.04423.17722.0607
C42.26221.25022.11301.45542.99622.99621.07852.3307
C52.26222.11301.25021.45542.99622.99622.33071.0785
H61.08962.04422.04422.99622.99621.78663.94483.9448
H71.08962.04422.04422.99622.99621.78663.94483.9448
H83.27442.06073.17721.07852.33073.94483.94482.9332
H93.27443.17722.06072.33071.07853.94483.94482.9332

picture of 2H-Imidazole state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 C4 120.304 C1 N3 C5 120.304
N2 C1 N3 94.525 N2 C1 H6 112.865
N2 C1 H7 112.865 N2 C4 C5 102.434
N2 C4 H8 124.322 N3 C1 H6 112.865
N3 C1 H7 112.865 N3 C5 C4 102.434
N3 C5 H9 124.322 C4 C5 H9 133.244
C5 C4 H8 133.244 H6 C1 H7 110.141
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability