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 (1H-Imidazole)

using model chemistry: CCSD(T)=FULL/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at CCSD(T)=FULL/6-31G*
 hartrees
Energy at 0K-225.592688
Energy at 298.15K-225.598551
HF Energy-224.810889
Nuclear repulsion energy162.550008
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 CCSD(T)=FULL/6-31G*
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' 3653 3546        
2 A' 3290 3193        
3 A' 3266 3170        
4 A' 3260 3165        
5 A' 1581 1535        
6 A' 1535 1490        
7 A' 1475 1432        
8 A' 1388 1347        
9 A' 1297 1259        
10 A' 1171 1137        
11 A' 1167 1133        
12 A' 1118 1086        
13 A' 1092 1060        
14 A' 942 914        
15 A' 905 879        
16 A" 816 792        
17 A" 790 767        
18 A" 694 673        
19 A" 673 653        
20 A" 628 609        
21 A" 476 462        

Unscaled Zero Point Vibrational Energy (zpe) 15607.9 cm-1
Scaled (by 0.9707) Zero Point Vibrational Energy (zpe) 15150.6 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 CCSD(T)=FULL/6-31G*
ABC
0.32354 0.31034 0.15840

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)=FULL/6-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 1.108 0.000
C2 -1.092 0.283 0.000
C3 1.123 0.302 0.000
N4 -0.748 -0.992 0.000
C5 0.639 -0.984 0.000
H6 -0.011 2.121 0.000
H7 -2.108 0.664 0.000
H8 2.127 0.709 0.000
H9 1.203 -1.910 0.000

Atom - Atom Distances (Å)
  N1 C2 C3 N4 C5 H6 H7 H8 H9
N11.36851.38292.22952.18751.01272.15382.16403.2492
C21.36852.21531.32082.14452.13191.08493.24663.1742
C31.38292.21532.27491.37432.14413.25131.08282.2132
N42.22951.32082.27491.38613.19892.14303.34012.1559
C52.18752.14451.37431.38613.17233.20262.25421.0845
H61.01272.13192.14413.19893.17232.55262.56244.2099
H72.15381.08493.25132.14303.20262.55264.23464.1936
H82.16403.24661.08283.34012.25422.56244.23462.7771
H93.24923.17422.21322.15591.08454.20994.19362.7771

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 111.984 N1 C2 H7 122.352
N1 C3 C5 105.006 N1 C3 H8 122.243
C2 N1 C3 107.243 C2 N1 H6 126.437
C2 N4 C5 104.766 C3 N1 H6 126.320
C3 C5 N4 111.001 C3 C5 H9 127.959
N4 C2 H7 125.664 N4 C5 H9 121.039
C5 C3 H8 132.751
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability