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 (4H-Imidazole)

using model chemistry: MP2=FULL/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 MP2=FULL/3-21G
 hartrees
Energy at 0K-224.006877
Energy at 298.15K-224.012713
HF Energy-223.505030
Nuclear repulsion energy156.465125
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 MP2=FULL/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' 3294 3145 7.31      
2 A' 3259 3112 5.33      
3 A' 3122 2981 0.01      
4 A' 1522 1453 15.77      
5 A' 1495 1428 9.08      
6 A' 1409 1346 0.77      
7 A' 1313 1253 2.94      
8 A' 1304 1245 11.46      
9 A' 1255 1199 12.81      
10 A' 974 930 30.07      
11 A' 917 876 5.10      
12 A' 889 849 4.87      
13 A' 811 774 8.35      
14 A' 768 733 14.86      
15 A" 3177 3034 0.34      
16 A" 1185 1132 0.04      
17 A" 1019 973 20.79      
18 A" 950 907 0.20      
19 A" 777 742 15.30      
20 A" 564 539 17.40      
21 A" 381 364 10.84      

Unscaled Zero Point Vibrational Energy (zpe) 15192.9 cm-1
Scaled (by 0.9548) Zero Point Vibrational Energy (zpe) 14506.2 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 MP2=FULL/3-21G
ABC
0.30220 0.27762 0.14883

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 1.162 0.558 0.000
C2 0.774 -0.891 0.000
N3 -0.505 -1.158 0.000
C4 -1.185 0.212 0.000
C5 0.000 1.177 0.000
H6 1.557 -1.634 0.000
H7 -1.807 0.296 0.896
H8 -1.807 0.296 -0.896
H9 -0.080 2.255 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.50032.39222.37211.31662.22683.11263.11262.1034
C21.50031.30632.24822.20811.07892.97892.97893.2605
N32.39221.30631.52962.38852.11612.14742.14743.4394
C42.37212.24821.52961.52753.30521.09421.09422.3224
C51.31662.20812.38851.52753.21282.20102.20101.0816
H62.22681.07892.11613.30523.21283.98033.98034.2195
H73.11262.97892.14741.09422.20103.98031.79212.7614
H83.11262.97892.14741.09422.20103.98031.79212.7614
H92.10343.26053.43942.32241.08164.21952.76142.7614

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 116.764 N1 C2 H6 118.476
N1 C5 C4 112.823 N1 C5 H9 122.280
C2 N1 C5 103.038 C2 N3 C4 104.617
N3 C2 H6 124.760 N3 C4 C5 102.758
N3 C4 H7 108.726 N3 C4 H8 108.726
C4 C5 H9 124.897 C5 C4 H7 113.146
C5 C4 H8 113.146 H7 C4 H8 109.953
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability