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

using model chemistry: QCISD(T)=FULL/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 QCISD(T)=FULL/cc-pVDZ
 hartrees
Energy at 0K-225.603293
Energy at 298.15K-225.609180
HF Energy-224.811355
Nuclear repulsion energy159.092473
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(T)=FULL/cc-pVDZ
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' 3233 3101        
2 A' 3212 3080        
3 A' 3064 2938        
4 A' 1634 1567        
5 A' 1546 1482        
6 A' 1405 1347        
7 A' 1315 1261        
8 A' 1301 1248        
9 A' 1255 1203        
10 A' 1029 987        
11 A' 999 958        
12 A' 943 904        
13 A' 872 836        
14 A' 867 832        
15 A" 3114 2987        
16 A" 1152 1105        
17 A" 991 950        
18 A" 943 904        
19 A" 751 720        
20 A" 552 529        
21 A" 359 345        

Unscaled Zero Point Vibrational Energy (zpe) 15268.3 cm-1
Scaled (by 0.959) Zero Point Vibrational Energy (zpe) 14642.3 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(T)=FULL/cc-pVDZ
ABC
0.31570 0.28621 0.15453

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(T)=FULL/cc-pVDZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.217 0.364 0.000
C2 0.000 1.142 0.000
N3 1.132 0.507 0.000
C4 0.740 -0.909 0.000
C5 -0.772 -0.861 0.000
H6 -0.070 2.235 0.000
H7 1.149 -1.422 0.892
H8 1.149 -1.422 -0.892
H9 -1.448 -1.724 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.44432.35342.33401.30262.19503.09483.09482.1006
C21.44431.29802.18002.14591.09562.94742.94743.2112
N32.35341.29801.46942.34432.10502.12532.12533.4115
C42.33402.18001.46941.51233.24661.10701.10702.3351
C51.30262.14592.34431.51233.17432.19022.19021.0971
H62.19501.09562.10503.24663.17433.95663.95664.1924
H73.09482.94742.12531.10702.19023.95661.78332.7622
H83.09482.94742.12531.10702.19023.95661.78332.7622
H92.10063.21123.41152.33511.09714.19242.76222.7622

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 118.127 N1 C2 H6 118.945
N1 C5 C4 111.807 N1 C5 H9 121.943
C2 N1 C5 102.623 C2 N3 C4 103.781
N3 C2 H6 122.928 N3 C4 C5 103.661
N3 C4 H7 110.376 N3 C4 H8 110.376
C4 C5 H9 126.250 C5 C4 H7 112.564
C5 C4 H8 112.564 H7 C4 H8 107.318
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability