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

using model chemistry: MP2/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 MP2/aug-cc-pVDZ
 hartrees
Energy at 0K-225.570310
Energy at 298.15K-225.576188
HF Energy-224.824882
Nuclear repulsion energy159.321425
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/aug-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' 3262 3128 7.42      
2 A' 3240 3107 5.03      
3 A' 3077 2951 1.68      
4 A' 1586 1521 25.34      
5 A' 1506 1444 4.83      
6 A' 1389 1332 20.65      
7 A' 1310 1257 22.93      
8 A' 1295 1242 4.08      
9 A' 1242 1191 4.46      
10 A' 1040 997 47.85      
11 A' 1001 960 10.22      
12 A' 954 915 2.43      
13 A' 866 831 9.99      
14 A' 863 827 5.12      
15 A" 3131 3002 0.16      
16 A" 1147 1100 0.55      
17 A" 979 939 19.42      
18 A" 939 901 0.83      
19 A" 741 710 6.64      
20 A" 554 531 17.69      
21 A" 352 337 5.46      

Unscaled Zero Point Vibrational Energy (zpe) 15235.9 cm-1
Scaled (by 0.959) Zero Point Vibrational Energy (zpe) 14611.2 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/aug-cc-pVDZ
ABC
0.31519 0.28858 0.15508

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/aug-cc-pVDZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.209 0.368 0.000
C2 0.000 1.146 0.000
N3 1.131 0.501 0.000
C4 0.732 -0.910 0.000
C5 -0.770 -0.863 0.000
H6 -0.066 2.235 0.000
H7 1.143 -1.417 0.890
H8 1.143 -1.417 -0.890
H9 -1.450 -1.719 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.43752.34412.32401.30702.18903.08413.08412.1007
C21.43751.30252.18242.15151.09122.94422.94423.2108
N32.34411.30251.46612.33982.10772.11432.11433.4044
C42.32402.18241.46611.50273.24481.10401.10402.3273
C51.30702.15152.33981.50273.17712.18162.18161.0931
H62.18901.09122.10773.24483.17713.94883.94884.1891
H73.08412.94422.11431.10402.18163.94881.78082.7584
H83.08412.94422.11431.10402.18163.94881.78082.7584
H92.10073.21083.40442.32731.09314.18912.75842.7584

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 117.543 N1 C2 H6 119.286
N1 C5 C4 111.413 N1 C5 H9 121.895
C2 N1 C5 103.135 C2 N3 C4 103.891
N3 C2 H6 123.171 N3 C4 C5 104.017
N3 C4 H7 109.905 N3 C4 H8 109.905
C4 C5 H9 126.692 C5 C4 H7 112.737
C5 C4 H8 112.737 H7 C4 H8 107.512
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability