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/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 QCISD/6-31G(2df,p)
 hartrees
Energy at 0K-225.695794
Energy at 298.15K-225.701795
HF Energy-224.837910
Nuclear repulsion energy163.410568
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/6-31G(2df,p)
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A' 3744 3547 73.36      
2 A' 3329 3154 1.24      
3 A' 3299 3126 1.04      
4 A' 3298 3124 3.45      
5 A' 1596 1512 14.48      
6 A' 1545 1464 17.52      
7 A' 1476 1398 22.10      
8 A' 1394 1320 8.06      
9 A' 1307 1238 0.49      
10 A' 1174 1113 4.21      
11 A' 1168 1107 4.48      
12 A' 1121 1062 11.43      
13 A' 1095 1037 37.07      
14 A' 949 899 1.35      
15 A' 912 864 7.92      
16 A" 882 836 1.58      
17 A" 857 812 25.37      
18 A" 754 714 29.65      
19 A" 688 652 3.83      
20 A" 648 614 12.62      
21 A" 508 481 94.20      

Unscaled Zero Point Vibrational Energy (zpe) 15870.7 cm-1
Scaled (by 0.9474) Zero Point Vibrational Energy (zpe) 15035.9 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/6-31G(2df,p)
ABC
0.32656 0.31388 0.16005

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 1.104 0.000
C2 -1.084 0.282 0.000
C3 1.118 0.297 0.000
N4 -0.746 -0.984 0.000
C5 0.636 -0.981 0.000
H6 -0.011 2.107 0.000
H7 -2.093 0.665 0.000
H8 2.114 0.704 0.000
H9 1.197 -1.901 0.000

Atom - Atom Distances (Å)
  N1 C2 C3 N4 C5 H6 H7 H8 H9
N11.36091.37872.21792.17971.00312.13832.15203.2348
C21.36092.20241.31042.13382.11731.07863.22643.1572
C31.37872.20242.26261.36602.13333.23171.07602.2000
N42.21791.31042.26261.38253.17772.12873.32182.1485
C52.17972.13381.36601.38253.15503.18632.24121.0777
H61.00312.11732.13333.17773.15502.53232.54734.1864
H72.13831.07863.23172.12873.18632.53234.20734.1716
H82.15203.22641.07603.32182.24122.54734.20732.7618
H93.23483.15722.20002.14851.07774.18644.17162.7618

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 112.239 N1 C2 H7 122.034
N1 C3 C5 105.147 N1 C3 H8 122.004
C2 N1 C3 107.010 C2 N1 H6 126.524
C2 N4 C5 104.788 C3 N1 H6 126.466
C3 C5 N4 110.816 C3 C5 H9 127.989
N4 C2 H7 125.726 N4 C5 H9 121.195
C5 C3 H8 132.849
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability