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All results from a given calculation for CH3CN (Acetonitrile)

using model chemistry: QCISD/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at QCISD/3-21G*
 hartrees
Energy at 0K-131.501892
Energy at 298.15K-131.504580
HF Energy-131.188095
Nuclear repulsion energy57.740051
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/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 A1 3046 2927 3.44      
2 A1 2297 2207 0.14      
3 A1 1494 1436 8.32      
4 A1 891 856 3.20      
5 E 3111 2990 3.56      
5 E 3111 2990 3.56      
6 E 1561 1501 11.33      
6 E 1561 1501 11.33      
7 E 1132 1088 2.10      
7 E 1132 1088 2.10      
8 E 423 406 0.00      
8 E 423 406 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 10090.3 cm-1
Scaled (by 0.9611) Zero Point Vibrational Energy (zpe) 9697.7 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 QCISD/3-21G*
ABC
5.24348 0.29921 0.29921

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.195
C2 0.000 0.000 0.283
N3 0.000 0.000 1.456
H4 0.000 1.031 -1.573
H5 0.893 -0.516 -1.573
H6 -0.893 -0.516 -1.573

Atom - Atom Distances (Å)
  C1 C2 N3 H4 H5 H6
C11.47822.65111.09831.09831.0983
C21.47821.17292.12342.12342.1234
N32.65111.17293.19983.19983.1998
H41.09832.12343.19981.78611.7861
H51.09832.12343.19981.78611.7861
H61.09832.12343.19981.78611.7861

picture of Acetonitrile state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N3 180.000 C2 C1 H4 110.131
C2 C1 H5 110.131 C2 C1 H6 110.131
H4 C1 H5 108.803 H4 C1 H6 108.803
H5 C1 H6 108.803
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability