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

using model chemistry: QCISD/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/cc-pVDZ
 hartrees
Energy at 0K-225.561912
Energy at 298.15K-225.567846
HF Energy-224.812788
Nuclear repulsion energy159.472010
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/cc-pVDZ
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' 3247 3116 12.92      
2 A' 3224 3094 8.79      
3 A' 3079 2954 4.51      
4 A' 1678 1610 37.55      
5 A' 1593 1528 10.97      
6 A' 1420 1363 11.97      
7 A' 1332 1278 21.01      
8 A' 1320 1266 9.38      
9 A' 1273 1221 4.20      
10 A' 1042 1000 49.75      
11 A' 1016 974 12.74      
12 A' 953 914 1.97      
13 A' 885 849 6.20      
14 A' 877 841 11.07      
15 A" 3128 3001 3.63      
16 A" 1168 1120 0.46      
17 A" 1011 970 14.54      
18 A" 965 926 0.38      
19 A" 765 734 4.98      
20 A" 559 536 20.75      
21 A" 367 352 5.22      

Unscaled Zero Point Vibrational Energy (zpe) 15450.4 cm-1
Scaled (by 0.9594) Zero Point Vibrational Energy (zpe) 14823.1 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/cc-pVDZ
ABC
0.31710 0.28755 0.15525

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.214 0.359 0.000
C2 0.000 1.140 0.000
N3 1.127 0.509 0.000
C4 0.741 -0.906 0.000
C5 -0.770 -0.859 0.000
H6 -0.073 2.232 0.000
H7 1.149 -1.418 0.891
H8 1.149 -1.418 -0.891
H9 -1.443 -1.724 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.44352.34552.32851.29592.19333.08843.08842.0954
C21.44351.29132.17582.14151.09492.94272.94273.2069
N32.34551.29131.46652.33822.09982.12362.12363.4046
C42.32852.17581.46651.51173.24211.10621.10622.3326
C51.29592.14152.33821.51173.16832.18882.18881.0966
H62.19331.09492.09983.24213.16833.95173.95174.1867
H73.08842.94272.12361.10622.18883.95171.78262.7585
H83.08842.94272.12361.10622.18883.95171.78262.7585
H92.09543.20693.40462.33261.09664.18672.75852.7585

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 118.006 N1 C2 H6 118.918
N1 C5 C4 111.837 N1 C5 H9 122.066
C2 N1 C5 102.709 C2 N3 C4 103.996
N3 C2 H6 123.076 N3 C4 C5 103.451
N3 C4 H7 110.484 N3 C4 H8 110.484
C4 C5 H9 126.097 C5 C4 H7 112.540
C5 C4 H8 112.540 H7 C4 H8 107.363
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability