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All results from a given calculation for C3H4N2 (1H-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-224.036553
Energy at 298.15K-224.042543
HF Energy-223.543177
Nuclear repulsion energy160.262726
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
(Å4/u)
Dep P Dep U
1 A' 3602 3415 69.62      
2 A' 3329 3156 0.97      
3 A' 3308 3136 1.98      
4 A' 3304 3132 1.33      
5 A' 1516 1437 22.07      
6 A' 1458 1382 5.40      
7 A' 1398 1325 13.39      
8 A' 1324 1255 6.46      
9 A' 1250 1185 10.91      
10 A' 1163 1103 1.57      
11 A' 1088 1032 23.81      
12 A' 1083 1027 12.82      
13 A' 1031 977 9.53      
14 A' 954 904 2.84      
15 A' 908 861 9.58      
16 A" 849 805 6.69      
17 A" 817 775 36.53      
18 A" 734 696 34.44      
19 A" 680 645 2.53      
20 A" 656 622 38.51      
21 A" 612 580 125.74      

Unscaled Zero Point Vibrational Energy (zpe) 15531.9 cm-1
Scaled (by 0.948) Zero Point Vibrational Energy (zpe) 14724.2 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
0.31229 0.30286 0.15375

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 0.000 1.126 0.000
C2 -1.116 0.291 0.000
C3 1.137 0.302 0.000
N4 -0.760 -1.008 0.000
C5 0.660 -0.997 0.000
H6 -0.000 2.139 0.000
H7 -2.125 0.668 0.000
H8 2.138 0.702 0.000
H9 1.223 -1.915 0.000

Atom - Atom Distances (Å)
  N1 C2 C3 N4 C5 H6 H7 H8 H9
N11.39371.40392.26482.22331.01302.17422.17933.2776
C21.39372.25301.34692.19432.15841.07733.27953.2153
C31.40392.25302.30501.38412.16033.28281.07742.2190
N42.26481.34692.30501.41993.23682.16163.36392.1804
C52.22332.19431.38411.41993.20493.24532.25141.0767
H61.01302.15842.16033.23683.20492.58452.57624.2345
H72.17421.07733.28282.16163.24532.58454.26324.2288
H82.17933.27951.07743.36392.25142.57624.26322.7719
H93.27763.21532.21902.18041.07674.23454.22882.7719

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 111.448 N1 C2 H7 122.744
N1 C3 C5 105.773 N1 C3 H8 122.320
C2 N1 C3 107.286 C2 N1 H6 126.767
C2 N4 C5 104.921 C3 N1 H6 125.947
C3 C5 N4 110.572 C3 C5 H9 128.340
N4 C2 H7 125.808 N4 C5 H9 121.088
C5 C3 H8 131.906
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability