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: MP2/6-31G(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 MP2/6-31G(2df,p)
 hartrees
Energy at 0K-225.646971
Energy at 298.15K-225.652880
HF Energy-224.817534
Nuclear repulsion energy160.541686
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 MP2/6-31G(2df,p)
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' 3276 3094 8.09      
2 A' 3258 3077 3.74      
3 A' 3108 2936 0.49      
4 A' 1614 1525 23.01      
5 A' 1534 1449 4.58      
6 A' 1419 1341 18.86      
7 A' 1331 1257 21.52      
8 A' 1311 1238 5.50      
9 A' 1264 1194 6.67      
10 A' 1057 999 49.33      
11 A' 1016 960 8.84      
12 A' 963 910 2.70      
13 A' 876 827 4.53      
14 A' 874 826 14.49      
15 A" 3160 2985 0.01      
16 A" 1168 1103 0.45      
17 A" 1003 948 11.60      
18 A" 960 907 1.45      
19 A" 754 713 5.46      
20 A" 562 531 18.53      
21 A" 356 337 7.01      

Unscaled Zero Point Vibrational Energy (zpe) 15432.9 cm-1
Scaled (by 0.9445) Zero Point Vibrational Energy (zpe) 14576.3 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 MP2/6-31G(2df,p)
ABC
0.32086 0.29209 0.15737

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G(2df,p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.203 0.364 0.000
C2 0.000 1.134 0.000
N3 1.124 0.501 0.000
C4 0.729 -0.902 0.000
C5 -0.765 -0.855 0.000
H6 -0.071 2.214 0.000
H7 1.137 -1.408 0.881
H8 1.137 -1.408 -0.881
H9 -1.435 -1.707 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.42822.33032.30951.29482.16903.06423.06422.0832
C21.42821.28972.16212.13081.08242.92082.92083.1823
N32.33031.28971.45652.32472.08852.10242.10243.3791
C42.30952.16211.45651.49513.21661.09491.09492.3094
C51.29482.13082.32471.49513.14642.16782.16781.0836
H62.16901.08242.08853.21663.14643.91863.91864.1511
H73.06422.92082.10241.09492.16783.91861.76182.7351
H83.06422.92082.10241.09492.16783.91861.76182.7351
H92.08323.18233.37912.30941.08364.15112.73512.7351

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 117.962 N1 C2 H6 118.885
N1 C5 C4 111.542 N1 C5 H9 122.038
C2 N1 C5 102.877 C2 N3 C4 103.703
N3 C2 H6 123.153 N3 C4 C5 103.915
N3 C4 H7 110.172 N3 C4 H8 110.172
C4 C5 H9 126.420 C5 C4 H7 112.732
C5 C4 H8 112.732 H7 C4 H8 107.130
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability