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: QCISD(T)/cc-pVTZ

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(T)/cc-pVTZ
 hartrees
Energy at 0K-225.833101
Energy at 298.15K-225.839049
HF Energy-224.893679
Nuclear repulsion energy162.965745
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(T)/cc-pVTZ
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' 3686 3497        
2 A' 3288 3119        
3 A' 3262 3095        
4 A' 3259 3091        
5 A' 1555 1475        
6 A' 1511 1434        
7 A' 1448 1374        
8 A' 1364 1294        
9 A' 1282 1216        
10 A' 1152 1093        
11 A' 1147 1088        
12 A' 1096 1039        
13 A' 1075 1019        
14 A' 935 887        
15 A' 899 853        
16 A" 864 820        
17 A" 827 785        
18 A" 730 692        
19 A" 675 640        
20 A" 639 606        
21 A" 492 467        

Unscaled Zero Point Vibrational Energy (zpe) 15592.3 cm-1
Scaled (by 0.9486) Zero Point Vibrational Energy (zpe) 14790.8 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 QCISD(T)/cc-pVTZ
ABC
0.32497 0.31187 0.15914

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(T)/cc-pVTZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 1.107 0.000
C2 -1.089 0.283 0.000
C3 1.121 0.301 0.000
N4 -0.747 -0.989 0.000
C5 0.637 -0.984 0.000
H6 -0.012 2.111 0.000
H7 -2.097 0.663 0.000
H8 2.118 0.704 0.000
H9 1.201 -1.902 0.000

Atom - Atom Distances (Å)
  N1 C2 C3 N4 C5 H6 H7 H8 H9
N11.36551.38052.22502.18561.00422.14372.15643.2395
C21.36552.20971.31732.14102.12161.07793.23473.1650
C31.38052.20972.26971.37262.13533.23851.07592.2040
N42.22501.31732.26971.38403.18592.13433.32782.1511
C52.18562.14101.37261.38403.16213.19242.24531.0773
H61.00422.12162.13533.18593.16212.53842.55324.1920
H72.14371.07793.23852.13433.19242.53844.21594.1785
H82.15643.23471.07593.32782.24532.55324.21592.7621
H93.23953.16502.20402.15111.07734.19204.17852.7621

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 112.059 N1 C2 H7 122.216
N1 C3 C5 105.098 N1 C3 H8 122.285
C2 N1 C3 107.164 C2 N1 H6 126.424
C2 N4 C5 104.833 C3 N1 H6 126.413
C3 C5 N4 110.846 C3 C5 H9 127.809
N4 C2 H7 125.725 N4 C5 H9 121.346
C5 C3 H8 132.617
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability