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 (4H-Imidazole)

using model chemistry: CCSD/TZVP

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/TZVP
 hartrees
Energy at 0K-225.643281
Energy at 298.15K-225.649212
HF Energy-224.863388
Nuclear repulsion energy160.594433
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/TZVP
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' 3266 3117 10.70      
2 A' 3241 3093 8.29      
3 A' 3092 2951 3.57      
4 A' 1684 1607 36.57      
5 A' 1598 1525 10.52      
6 A' 1452 1386 12.51      
7 A' 1359 1297 21.40      
8 A' 1344 1283 8.41      
9 A' 1310 1250 6.18      
10 A' 1044 997 59.05      
11 A' 1014 968 5.88      
12 A' 958 915 2.26      
13 A' 893 852 5.86      
14 A' 884 844 6.76      
15 A" 3136 2993 3.00      
16 A" 1174 1121 0.41      
17 A" 1026 979 15.76      
18 A" 948 905 0.04      
19 A" 765 730 5.34      
20 A" 556 531 22.06      
21 A" 352 336 4.64      

Unscaled Zero Point Vibrational Energy (zpe) 15548.5 cm-1
Scaled (by 0.9544) Zero Point Vibrational Energy (zpe) 14839.5 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/TZVP
ABC
0.32056 0.29207 0.15732

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD/TZVP

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -1.203 0.350 0.000
C2 0.000 1.137 0.000
N3 1.115 0.512 0.000
C4 0.738 -0.902 0.000
C5 -0.764 -0.857 0.000
H6 -0.080 2.215 0.000
H7 1.141 -1.402 0.884
H8 1.141 -1.402 -0.884
H9 -1.426 -1.714 0.000

Atom - Atom Distances (Å)
  N1 C2 N3 C4 C5 H6 H7 H8 H9
N11.43782.32452.30961.28412.17673.05743.05742.0756
C21.43781.27882.16782.13511.08072.92042.92043.1873
N32.32451.27881.46282.32512.08092.10792.10793.3780
C42.30962.16781.46281.50273.22181.09311.09312.3110
C51.28412.13512.32511.50273.14662.17032.17031.0826
H62.17671.08072.08093.22183.14663.91823.91824.1524
H73.05742.92042.10791.09312.17033.91821.76842.7331
H83.05742.92042.10791.09312.17033.91821.76842.7331
H92.07563.18733.37802.31101.08264.15242.73312.7331

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 117.548 N1 C2 H6 118.922
N1 C5 C4 111.703 N1 C5 H9 122.338
C2 N1 C5 103.188 C2 N3 C4 104.304
N3 C2 H6 123.531 N3 C4 C5 103.257
N3 C4 H7 110.283 N3 C4 H8 110.283
C4 C5 H9 125.959 C5 C4 H7 112.501
C5 C4 H8 112.501 H7 C4 H8 107.979
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability