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All results from a given calculation for NH2CCNH2 (Diaminoacetylene)

using model chemistry: CCSD/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2 1A
Energy calculated at CCSD/6-31G*
 hartrees
Energy at 0K-187.465210
Energy at 298.15K-187.469126
HF Energy-186.867798
Nuclear repulsion energy101.135534
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/6-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A 3622 3421 12.12      
2 A 3532 3335 2.66      
3 A 2415 2280 0.00      
4 A 1713 1617 16.63      
5 A 1246 1177        
6 A 830 784 18.95      
7 A 702 663 107.66      
8 A 384 362 0.00      
9 A 331 313 43.69      
10 A 199 188 11.34      
11 B 3622 3420 11.09      
12 B 3534 3337 6.99      
13 B 1712 1617 32.80      
14 B 1358 1282 63.23      
15 B 1245 1176 0.36      
16 B 762 719 409.22      
17 B 337 318 18.56      
18 B 177 167 11.22      

Unscaled Zero Point Vibrational Energy (zpe) 13859.8 cm-1
Scaled (by 0.9443) Zero Point Vibrational Energy (zpe) 13087.8 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 CCSD/6-31G*
ABC
4.98411 0.11766 0.11759

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD/6-31G*

Point Group is C2

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.008 0.608 0.030
C2 -0.008 -0.608 0.030
N3 -0.008 1.973 -0.073
N4 0.008 -1.973 -0.073
H5 -0.326 2.454 0.760
H6 0.853 2.378 -0.426
H7 0.326 -2.454 0.760
H8 -0.853 -2.378 -0.426

Atom - Atom Distances (Å)
  C1 C2 N3 N4 H5 H6 H7 H8
C11.21521.36912.58222.01402.01383.16393.1403
C21.21522.58221.36913.16393.14032.01402.0138
N31.36912.58223.94531.01421.01444.51724.4459
N42.58221.36913.94534.51724.44591.01421.0144
H52.01403.16391.01424.51721.67414.95195.0035
H62.01383.14031.01444.44591.67415.00355.0525
H73.16392.01404.51721.01424.95195.00351.6741
H83.14032.01384.44591.01445.00355.05251.6741

picture of Diaminoacetylene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N4 175.454 C1 N3 H5 114.537
C1 N3 H6 114.510 C2 C1 N3 175.454
C2 N4 H7 114.537 C2 N4 H8 114.510
H5 N3 H6 111.229 H7 N4 H8 111.229
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability