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All results from a given calculation for HCCNH2 (Ethynamine)

using model chemistry: CISD/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at CISD/3-21G*
 hartrees
Energy at 0K-131.394784
Energy at 298.15K-131.396699
HF Energy-131.122952
Nuclear repulsion energy59.387493
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 CISD/3-21G*
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' 3639 3400 42.82      
2 A' 3532 3301 71.85      
3 A' 2306 2154 90.93      
4 A' 1752 1637 53.56      
5 A' 1118 1045 23.51      
6 A' 579 541 116.08      
7 A' 536 501 0.96      
8 A' 133 125 451.28      
9 A" 3745 3500 45.01      
10 A" 1217 1137 7.66      
11 A" 829 775 34.99      
12 A" 458 428 14.64      

Unscaled Zero Point Vibrational Energy (zpe) 9921.5 cm-1
Scaled (by 0.9344) Zero Point Vibrational Energy (zpe) 9270.7 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 CISD/3-21G*
ABC
11.21813 0.31064 0.30227

See section I.F.4 to change rotational constant units
Geometric Data calculated at CISD/3-21G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.000 1.374 0.000
C2 0.000 0.164 0.000
N3 -0.000 -1.181 0.000
H4 -0.000 2.435 0.000
H5 0.001 -1.698 0.863
H6 0.001 -1.698 -0.863

Atom - Atom Distances (Å)
  C1 C2 N3 H4 H5 H6
C11.20972.55481.06073.19113.1911
C21.20971.34512.27042.05282.0528
N32.55481.34513.61551.00651.0065
H41.06072.27043.61554.22204.2220
H53.19112.05281.00654.22201.7269
H63.19112.05281.00654.22201.7269

picture of Ethynamine state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N3 179.991 C2 C1 H4 179.999
C2 N3 H5 120.924 C2 N3 H6 120.924
H5 N3 H6 118.153
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability