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 C2H2N4 (sym-tetrazine)

using model chemistry: MP2/CEP-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at MP2/CEP-31G*
 hartrees
Energy at 0K-51.609069
Energy at 298.15K-51.614219
Nuclear repulsion energy106.023206
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/CEP-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 Ag 3265 3100 0.00      
2 Ag 1427 1355 0.00      
3 Ag 987 937 0.00      
4 Ag 730 693 0.00      
5 Au 340 323 0.00      
6 B1u 3259 3094 7.01      
7 B1u 1194 1134 57.13      
8 B1u 1090 1035 1.24      
9 B2g 977 928 0.00      
10 B2g 805 764 0.00      
11 B2u 1453 1380 4.79      
12 B2u 1220 1158 1.65      
13 B2u 1074 1020 29.92      
14 B3g 1527 1450 0.00      
15 B3g 1312 1246 0.00      
16 B3g 619 588 0.00      
17 B3u 922 875 4.48      
18 B3u 271 258 59.43      

Unscaled Zero Point Vibrational Energy (zpe) 11236.6 cm-1
Scaled (by 0.9494) Zero Point Vibrational Energy (zpe) 10668.0 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/CEP-31G*
ABC
0.22097 0.20174 0.10546

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-31G*

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.278
C2 0.000 0.000 -1.278
N3 0.000 1.221 0.678
N4 0.000 -1.221 0.678
N5 0.000 -1.221 -0.678
N6 0.000 1.221 -0.678
H7 0.000 0.000 2.372
H8 0.000 0.000 -2.372

Atom - Atom Distances (Å)
  C1 C2 N3 N4 N5 N6 H7 H8
C12.55561.36061.36062.30612.30611.09383.6494
C22.55562.30612.30611.36061.36063.64941.0938
N31.36062.30612.44282.79421.35652.08793.2853
N41.36062.30612.44281.35652.79422.08793.2853
N52.30611.36062.79421.35652.44283.28532.0879
N62.30611.36061.35652.79422.44283.28532.0879
H71.09383.64942.08792.08793.28533.28534.7432
H83.64941.09383.28533.28532.08792.08794.7432

picture of sym-tetrazine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N3 N6 116.146 C1 N4 N5 116.146
C2 N5 N4 116.146 C2 N6 N3 116.146
N3 C1 N4 127.708 N3 C1 H7 116.146
N4 C1 H7 116.146 N5 C2 N6 127.708
N5 C2 H8 116.146 N6 C2 H8 116.146
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability