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All results from a given calculation for C2H2N4 (sym-tetrazine)

using model chemistry: QCISD/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at QCISD/3-21G*
 hartrees
Energy at 0K-293.524672
Energy at 298.15K-293.529484
Nuclear repulsion energy206.630321
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/3-21G*
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 3221 3096 0.00      
2 Ag 1288 1238 0.00      
3 Ag 908 872 0.00      
4 Ag 739 710 0.00      
5 Au 323 310 0.00      
6 B1u 3219 3093 6.48      
7 B1u 1156 1111 52.87      
8 B1u 1035 994 7.68      
9 B2g 997 958 0.00      
10 B2g 791 760 0.00      
11 B2u 1438 1382 20.01      
12 B2u 1015 976 0.21      
13 B2u 428 411 31.65      
14 B3g 1439 1383 0.00      
15 B3g 1301 1250 0.00      
16 B3g 623 599 0.00      
17 B3u 941 904 3.76      
18 B3u 276 265 61.32      

Unscaled Zero Point Vibrational Energy (zpe) 10567.7 cm-1
Scaled (by 0.9611) Zero Point Vibrational Energy (zpe) 10156.6 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 QCISD/3-21G*
ABC
0.21242 0.20173 0.10347

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/3-21G*

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.302
C2 0.000 0.000 -1.302
N3 0.000 1.221 0.697
N4 0.000 -1.221 0.697
N5 0.000 -1.221 -0.697
N6 0.000 1.221 -0.697
H7 0.000 0.000 2.386
H8 0.000 0.000 -2.386

Atom - Atom Distances (Å)
  C1 C2 N3 N4 N5 N6 H7 H8
C12.60451.36331.36332.34252.34251.08403.6885
C22.60452.34252.34251.36331.36333.68851.0840
N31.36332.34252.44292.81231.39332.08493.3161
N41.36332.34252.44291.39332.81232.08493.3161
N52.34251.36332.81231.39332.44293.31612.0849
N62.34251.36331.39332.81232.44293.31612.0849
H71.08403.68852.08492.08493.31613.31614.7725
H83.68851.08403.31613.31612.08492.08494.7725

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 116.373 C1 N4 N5 116.373
C2 N5 N4 116.373 C2 N6 N3 116.373
N3 C1 N4 127.253 N3 C1 H7 116.373
N4 C1 H7 116.373 N5 C2 N6 127.253
N5 C2 H8 116.373 N6 C2 H8 116.373
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability