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: HF/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2H 1Ag
Energy calculated at HF/6-31G(2df,p)
 hartrees
Energy at 0K-294.621618
Energy at 298.15K-294.627243
Nuclear repulsion energy216.771063
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 HF/6-31G(2df,p)
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 3392 3071 0.00      
2 Ag 1722 1559 0.00      
3 Ag 1174 1063 0.00      
4 Ag 822 745 0.00      
5 Au 457 414 0.00      
6 B1u 3389 3069 9.62      
7 B1u 1371 1241 81.90      
8 B1u 1191 1079 8.18      
9 B2g 1113 1008 0.00      
10 B2g 909 823 0.00      
11 B2u 1640 1485 1.52      
12 B2u 1267 1148 20.57      
13 B2u 850 770 105.76      
14 B3g 1779 1611 0.00      
15 B3g 1443 1307 0.00      
16 B3g 709 642 0.00      
17 B3u 1042 944 0.76      
18 B3u 407 368 51.69      

Unscaled Zero Point Vibrational Energy (zpe) 12337.8 cm-1
Scaled (by 0.9055) Zero Point Vibrational Energy (zpe) 11171.9 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 HF/6-31G(2df,p)
ABC
0.23555 0.22061 0.11392

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/6-31G(2df,p)

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 1.250
C2 0.000 0.000 -1.250
N3 0.000 1.168 0.644
N4 0.000 -1.168 0.644
N5 0.000 -1.168 -0.644
N6 0.000 1.168 -0.644
H7 0.000 0.000 2.322
H8 0.000 0.000 -2.322

Atom - Atom Distances (Å)
  C1 C2 N3 N4 N5 N6 H7 H8
C12.49931.31581.31582.22482.22481.07223.5716
C22.49932.22482.22481.31581.31583.57161.0722
N31.31582.22482.33602.66741.28772.04453.1875
N41.31582.22482.33601.28772.66742.04453.1875
N52.22481.31582.66741.28772.33603.18752.0445
N62.22481.31581.28772.66742.33603.18752.0445
H71.07223.57162.04452.04453.18753.18754.6438
H83.57161.07223.18753.18752.04452.04454.6438

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 117.414 C1 N4 N5 117.414
C2 N5 N4 117.414 C2 N6 N3 117.414
N3 C1 N4 125.171 N3 C1 H7 117.414
N4 C1 H7 117.414 N5 C2 N6 125.171
N5 C2 H8 117.414 N6 C2 H8 117.414
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.096      
2 C 0.096      
3 N -0.150      
4 N -0.150      
5 N -0.150      
6 N -0.150      
7 H 0.204      
8 H 0.204      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 0.000 0.000
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -32.626 0.000 0.000
y 0.000 -43.192 0.000
z 0.000 0.000 -27.446
Traceless
 xyz
x 2.693 0.000 0.000
y 0.000 -13.156 0.000
z 0.000 0.000 10.463
Polar
3z2-r220.926
x2-y210.566
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.424 0.000 0.000
y 0.000 6.539 0.000
z 0.000 0.000 7.601


<r2> (average value of r2) Å2
<r2> 100.829
(<r2>)1/2 10.041