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

using model chemistry: MP2=FULL/STO-3G

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/STO-3G
 hartrees
Energy at 0K-222.281668
Energy at 298.15K-222.287306
HF Energy-221.963179
Nuclear repulsion energy154.373177
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/STO-3G
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' 3525 3134 1.54      
2 A' 3519 3128 6.01      
3 A' 3392 3015 2.53      
4 A' 1635 1453 2.42      
5 A' 1608 1429 2.21      
6 A' 1529 1360 0.27      
7 A' 1397 1241 1.31      
8 A' 1356 1206 14.06      
9 A' 1318 1172 0.17      
10 A' 1044 928 7.96      
11 A' 1023 910 7.20      
12 A' 1004 893 3.80      
13 A' 883 785 4.97      
14 A' 860 765 1.71      
15 A" 3504 3115 0.56      
16 A" 1240 1102 0.74      
17 A" 1038 923 4.09      
18 A" 932 828 0.28      
19 A" 794 706 5.67      
20 A" 552 491 6.82      
21 A" 368 327 5.83      

Unscaled Zero Point Vibrational Energy (zpe) 16261.4 cm-1
Scaled (by 0.8889) Zero Point Vibrational Energy (zpe) 14454.8 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/STO-3G
ABC
0.29896 0.26680 0.14496

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.276 0.361 0.000
C2 0.000 1.175 0.000
N3 1.177 0.538 0.000
C4 0.759 -0.941 0.000
C5 -0.783 -0.886 0.000
H6 -0.079 2.276 0.000
H7 1.174 -1.439 0.902
H8 1.174 -1.439 -0.902
H9 -1.437 -1.774 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.51332.45952.41611.34072.25833.17063.17062.1406
C21.51331.33822.24802.20431.10393.00343.00343.2800
N32.45951.33821.53722.42282.14402.17272.17273.4900
C42.41612.24801.53721.54333.32431.11011.11012.3491
C51.34072.20432.42281.54333.23912.22442.22441.1029
H62.25831.10392.14403.32433.23914.02234.02234.2712
H73.17063.00342.17271.11012.22444.02231.80342.7827
H83.17063.00342.17271.11012.22444.02231.80342.7827
H92.14063.28003.49002.34911.10294.27122.78272.7827

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 119.069 N1 C2 H6 118.440
N1 C5 C4 113.626 N1 C5 H9 122.033
C2 N1 C5 100.957 C2 N3 C4 102.628
N3 C2 H6 122.491 N3 C4 C5 103.719
N3 C4 H7 109.254 N3 C4 H8 109.254
C4 C5 H9 124.341 C5 C4 H7 112.904
C5 C4 H8 112.904 H7 C4 H8 108.636
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability