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All results from a given calculation for NH2CCNH2 (Diaminoacetylene)

using model chemistry: QCISD/6-311G*

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/6-311G*
 hartrees
Energy at 0K-187.539695
Energy at 298.15K-187.543763
HF Energy-186.914982
Nuclear repulsion energy101.447682
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/6-311G*
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 3658 3502 10.89      
2 A 3570 3418 2.08      
3 A 2384 2283 0.07      
4 A 1736 1662 18.27      
5 A 1259 1205 0.01      
6 A 823 788 21.19      
7 A 700 670 117.72      
8 A 396 379 0.20      
9 A 356 341 38.52      
10 A 199 191 16.90      
11 B 3658 3502 10.30      
12 B 3572 3420 4.75      
13 B 1736 1662 38.69      
14 B 1355 1298 74.29      
15 B 1258 1205 0.01      
16 B 763 730 400.64      
17 B 392 376 16.62      
18 B 199 191 19.46      

Unscaled Zero Point Vibrational Energy (zpe) 14006.9 cm-1
Scaled (by 0.9574) Zero Point Vibrational Energy (zpe) 13410.2 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/6-311G*
ABC
5.06269 0.11821 0.11817

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/6-311G*

Point Group is C2

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.004 0.606 0.052
C2 -0.004 -0.606 0.052
N3 -0.004 1.965 -0.085
N4 0.004 -1.965 -0.085
H5 -0.325 2.463 0.731
H6 0.857 2.351 -0.444
H7 0.325 -2.463 0.731
H8 -0.857 -2.351 -0.444

Atom - Atom Distances (Å)
  C1 C2 N3 N4 H5 H6 H7 H8
C11.21241.36532.57442.00432.00433.15993.1191
C21.21242.57441.36533.15993.11912.00432.0043
N31.36532.57443.92911.00911.00934.51424.4133
N42.57441.36533.92914.51424.41331.00911.0093
H52.00433.15991.00914.51421.67054.96884.9834
H62.00433.11911.00934.41331.67054.98345.0040
H73.15992.00434.51421.00914.96884.98341.6705
H83.11912.00434.41331.00934.98345.00401.6705

picture of Diaminoacetylene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N4 174.192 C1 N3 H5 114.321
C1 N3 H6 114.305 C2 C1 N3 174.192
C2 N4 H7 114.321 C2 N4 H8 114.305
H5 N3 H6 111.710 H7 N4 H8 111.710
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability