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All results from a given calculation for NH2CCNH2 (Diaminoacetylene)

using model chemistry: QCISD(T)/aug-cc-pVDZ

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)/aug-cc-pVDZ
 hartrees
Energy at 0K-187.575081
Energy at 298.15K-187.578762
HF Energy-186.904562
Nuclear repulsion energy100.402104
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)/aug-cc-pVDZ
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 3598 3518        
2 A 3504 3426        
3 A 2324 2272        
4 A 1638 1602        
5 A 1203 1176        
6 A 797 780        
7 A 640 626        
8 A 336 329        
9 A 321 314        
10 A 148 145        
11 B 3598 3518        
12 B 3505 3428        
13 B 1638 1602        
14 B 1318 1289        
15 B 1202 1175        
16 B 700 684        
17 B 328 320        
18 B 149 145        

Unscaled Zero Point Vibrational Energy (zpe) 13472.7 cm-1
Scaled (by 0.9778) Zero Point Vibrational Energy (zpe) 13173.6 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(T)/aug-cc-pVDZ
ABC
4.97076 0.11571 0.11568

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

Point Group is C2

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.045 0.614 -0.005
C2 -0.045 -0.614 -0.005
N3 0.045 1.994 -0.059
N4 -0.045 -1.994 -0.059
H5 -0.238 2.430 0.818
H6 0.933 2.381 -0.374
H7 0.238 -2.430 0.818
H8 -0.933 -2.381 -0.374

Atom - Atom Distances (Å)
  C1 C2 N3 N4 H5 H6 H7 H8
C11.23121.38092.60992.01352.01223.15913.1723
C21.23122.60991.38093.15913.17232.01352.0122
N31.38092.60993.98871.01901.01914.51414.4941
N42.60991.38093.98874.51414.49411.01901.0191
H52.01353.15911.01904.51411.67084.88325.0051
H62.01223.17231.01914.49411.67085.00515.1152
H73.15912.01354.51411.01904.88325.00511.6708
H83.17232.01224.49411.01915.00515.11521.6708

picture of Diaminoacetylene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N4 175.285 C1 N3 H5 113.203
C1 N3 H6 113.079 C2 C1 N3 175.285
C2 N4 H7 113.203 C2 N4 H8 113.079
H5 N3 H6 110.130 H7 N4 H8 110.130
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability