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 NH2CCNH2 (Diaminoacetylene)

using model chemistry: QCISD(T)/TZVP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2 1A
Energy calculated at QCISD(T)/TZVP
 hartrees
Energy at 0K-187.614714
Energy at 298.15K-187.618609
HF Energy-186.942766
Nuclear repulsion energy101.403222
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(T)/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 3636 3502        
2 A 3543 3413        
3 A 2352 2265        
4 A 1665 1603        
5 A 1220 1175        
6 A 814 784        
7 A 692 666        
8 A 389 375        
9 A 337 324        
10 A 182 176        
11 B 3636 3502        
12 B 3545 3415        
13 B 1663 1602        
14 B 1332 1283        
15 B 1218 1173        
16 B 751 724        
17 B 347 334        
18 B 158 152        

Unscaled Zero Point Vibrational Energy (zpe) 13739.8 cm-1
Scaled (by 0.9632) Zero Point Vibrational Energy (zpe) 13234.2 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(T)/TZVP
ABC
5.01508 0.11827 0.11821

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(T)/TZVP

Point Group is C2

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.075 0.602 -0.015
C2 -0.075 -0.602 -0.015
N3 0.075 1.971 -0.051
N4 -0.075 -1.971 -0.051
H5 -0.203 2.395 0.824
H6 0.950 2.360 -0.377
H7 0.203 -2.395 0.824
H8 -0.950 -2.360 -0.377

Atom - Atom Distances (Å)
  C1 C2 N3 N4 H5 H6 H7 H8
C11.21261.37042.57772.00011.99743.11503.1554
C21.21262.57771.37043.11503.15542.00011.9974
N31.37042.57773.94581.01151.01154.45554.4636
N42.57771.37043.94584.45554.46361.01151.0115
H52.00013.11501.01154.45551.66544.80794.9618
H61.99743.15541.01154.46361.66544.96185.0892
H73.11502.00014.45551.01154.80794.96181.6654
H83.15541.99744.46361.01154.96185.08921.6654

picture of Diaminoacetylene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N4 172.704 C1 N3 H5 113.360
C1 N3 H6 113.126 C2 C1 N3 172.704
C2 N4 H7 113.360 C2 N4 H8 113.126
H5 N3 H6 110.816 H7 N4 H8 110.816
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability