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All results from a given calculation for CH3CN (Acetonitrile)

using model chemistry: MP2/CEP-121G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at MP2/CEP-121G*
 hartrees
Energy at 0K-22.818134
Energy at 298.15K-22.820653
HF Energy-22.398721
Nuclear repulsion energy30.825150
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 MP2/CEP-121G*
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 3096 2950 6.37      
2 A1 2159 2057 0.28      
3 A1 1447 1379 2.20      
4 A1 914 871 2.56      
5 E 3202 3051 2.47      
5 E 3202 3051 2.47      
6 E 1517 1446 12.12      
6 E 1517 1446 12.12      
7 E 1078 1028 0.66      
7 E 1078 1028 0.66      
8 E 344 328 0.04      
8 E 344 328 0.04      

Unscaled Zero Point Vibrational Energy (zpe) 9950.5 cm-1
Scaled (by 0.9528) Zero Point Vibrational Energy (zpe) 9480.8 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 MP2/CEP-121G*
ABC
5.26801 0.29746 0.29746

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-121G*

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.133
C2 0.000 0.000 0.345
N3 0.000 0.000 1.530
H4 0.000 1.029 -1.500
H5 0.891 -0.514 -1.500
H6 -0.891 -0.514 -1.500

Atom - Atom Distances (Å)
  C1 C2 N3 H4 H5 H6
C11.47822.66321.09221.09221.0922
C21.47821.18502.11242.11242.1124
N32.66321.18503.19983.19983.1998
H41.09222.11243.19981.78191.7819
H51.09222.11243.19981.78191.7819
H61.09222.11243.19981.78191.7819

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 109.621
C2 C1 H5 109.621 C2 C1 H6 109.621
H4 C1 H5 109.321 H4 C1 H6 109.321
H5 C1 H6 109.321
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability