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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-22.630928
Energy at 298.15K-22.633408
HF Energy-22.325796
Nuclear repulsion energy30.335485
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 3002 2930 12.99      
2 A1 2031 1982 2.54      
3 A1 1466 1431 4.16      
4 A1 880 859 3.08      
5 E 3112 3038 9.37      
5 E 3112 3038 9.37      
6 E 1509 1472 13.35      
6 E 1509 1472 13.35      
7 E 1090 1064 0.29      
7 E 1090 1064 0.29      
8 E 323 316 0.04      
8 E 323 316 0.04      

Unscaled Zero Point Vibrational Energy (zpe) 9723.3 cm-1
Scaled (by 0.976) Zero Point Vibrational Energy (zpe) 9490.0 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
5.21756 0.28696 0.28696

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 -1.152
C2 0.000 0.000 0.347
N3 0.000 0.000 1.561
H4 0.000 1.034 -1.527
H5 0.895 -0.517 -1.527
H6 -0.895 -0.517 -1.527

Atom - Atom Distances (Å)
  C1 C2 N3 H4 H5 H6
C11.49892.71271.09971.09971.0997
C21.49891.21382.14022.14022.1402
N32.71271.21383.25623.25623.2562
H41.09972.14023.25621.79051.7905
H51.09972.14023.25621.79051.7905
H61.09972.14023.25621.79051.7905

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 109.942
C2 C1 H5 109.942 C2 C1 H6 109.942
H4 C1 H5 108.996 H4 C1 H6 108.996
H5 C1 H6 108.996
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability