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

using model chemistry: MP4/aug-cc-pVDZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP4/aug-cc-pVDZ
 hartrees
Energy at 0K-225.637155
Energy at 298.15K-225.643006
HF Energy-224.823419
Nuclear repulsion energy158.638026
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 MP4/6-31G*
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' 3235 3161        
2 A' 3213 3139        
3 A' 3064 2994        
4 A' 1621 1583        
5 A' 1536 1501        
6 A' 1458 1424        
7 A' 1330 1300        
8 A' 1317 1287        
9 A' 1283 1253        
10 A' 1033 1009        
11 A' 999 976        
12 A' 957 935        
13 A' 873 852        
14 A' 868 848        
15 A" 3110 3038        
16 A" 1169 1142        
17 A" 1005 981        
18 A" 930 909        
19 A" 756 738        
20 A" 556 543        
21 A" 363 355        

Unscaled Zero Point Vibrational Energy (zpe) 15338.0 cm-1
Scaled (by 0.9769) Zero Point Vibrational Energy (zpe) 14983.7 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 MP4/aug-cc-pVDZ
ABC
0.31275 0.28561 0.15366

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP4/aug-cc-pVDZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.216 0.366 0.000
C2 0.000 1.150 0.000
N3 1.135 0.506 0.000
C4 0.739 -0.914 0.000
C5 -0.773 -0.866 0.000
H6 -0.069 2.242 0.000
H7 1.150 -1.422 0.894
H8 1.150 -1.422 -0.894
H9 -1.453 -1.726 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.44712.35542.33741.30942.19903.09763.09762.1058
C21.44711.30472.19262.15931.09432.95572.95573.2225
N32.35541.30471.47452.35032.11252.12532.12533.4176
C42.33742.19261.47451.51323.25821.10691.10692.3375
C51.30942.15932.35031.51323.18692.19242.19241.0963
H62.19901.09432.11253.25823.18693.96363.96364.2028
H73.09762.95572.12531.10692.19243.96361.78742.7686
H83.09762.95572.12531.10692.19243.96361.78742.7686
H92.10583.22253.41762.33751.09634.20282.76862.7686

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 117.634 N1 C2 H6 119.178
N1 C5 C4 111.602 N1 C5 H9 121.925
C2 N1 C5 103.022 C2 N3 C4 104.001
N3 C2 H6 123.188 N3 C4 C5 103.741
N3 C4 H7 110.020 N3 C4 H8 110.020
C4 C5 H9 126.473 C5 C4 H7 112.675
C5 C4 H8 112.675 H7 C4 H8 107.678
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability