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All results from a given calculation for NH2CCNH2 (Diaminoacetylene)

using model chemistry: CCSD/cc-pVTZ

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/cc-pVTZ
 hartrees
Energy at 0K-187.691955
Energy at 298.15K-187.696082
HF Energy-186.951008
Nuclear repulsion energy101.836495
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/cc-pVTZ
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 3665 3450 22.42      
2 A 3577 3367 2.21      
3 A 2406 2264 0.08      
4 A 1677 1579 11.23      
5 A 1235 1162 0.42      
6 A 823 774 10.67      
7 A 663 624 96.64      
8 A 420 395 2.86      
9 A 342 322 28.25      
10 A 215 203 17.66      
11 B 3665 3450 21.77      
12 B 3579 3368 14.19      
13 B 1676 1578 27.12      
14 B 1353 1274 90.68      
15 B 1235 1162 0.44      
16 B 718 676 312.80      
17 B 420 395 16.92      
18 B 216 203 20.26      

Unscaled Zero Point Vibrational Energy (zpe) 13942.5 cm-1
Scaled (by 0.9412) Zero Point Vibrational Energy (zpe) 13122.7 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/cc-pVTZ
ABC
5.09575 0.11913 0.11911

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD/cc-pVTZ

Point Group is C2

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.002 0.603 0.057
C2 -0.002 -0.603 0.057
N3 -0.002 1.956 -0.089
N4 0.002 -1.956 -0.089
H5 -0.321 2.458 0.722
H6 0.860 2.336 -0.441
H7 0.321 -2.458 0.722
H8 -0.860 -2.336 -0.441

Atom - Atom Distances (Å)
  C1 C2 N3 N4 H5 H6 H7 H8
C11.20541.36122.56281.99701.99733.14813.1031
C21.20542.56281.36123.14813.10311.99701.9973
N31.36122.56283.91201.00551.00574.49934.3913
N42.56281.36123.91204.49934.39131.00551.0057
H51.99703.14811.00554.49931.66204.95744.9625
H61.99733.10311.00574.39131.66204.96254.9790
H73.14811.99704.49931.00554.95744.96251.6620
H83.10311.99734.39131.00574.96254.97901.6620

picture of Diaminoacetylene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N4 173.828 C1 N3 H5 114.245
C1 N3 H6 114.263 C2 C1 N3 173.828
C2 N4 H7 114.245 C2 N4 H8 114.263
H5 N3 H6 111.450 H7 N4 H8 111.450
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability