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All results from a given calculation for CH3CN (Acetonitrile)

using model chemistry: MP2/CEP-31G

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-31G
 hartrees
Energy at 0K-22.596333
Energy at 298.15K-22.598815
HF Energy-22.316695
Nuclear repulsion energy30.065918
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-31G
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 3063 2960 15.43      
2 A1 2035 1967 3.90      
3 A1 1467 1418 3.41      
4 A1 892 861 3.63      
5 E 3173 3066 16.46      
5 E 3173 3066 16.46      
6 E 1513 1462 14.63      
6 E 1513 1462 14.63      
7 E 1101 1064 0.59      
7 E 1101 1064 0.59      
8 E 329 318 0.08      
8 E 329 318 0.08      

Unscaled Zero Point Vibrational Energy (zpe) 9844.5 cm-1
Scaled (by 0.9663) Zero Point Vibrational Energy (zpe) 9512.7 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 MP2/CEP-31G
ABC
5.13505 0.28166 0.28166

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-31G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.164
C2 0.000 0.000 0.349
N3 0.000 0.000 1.575
H4 0.000 1.042 -1.539
H5 0.902 -0.521 -1.539
H6 -0.902 -0.521 -1.539

Atom - Atom Distances (Å)
  C1 C2 N3 H4 H5 H6
C11.51282.73921.10751.10751.1075
C21.51281.22642.15632.15632.1563
N32.73921.22643.28403.28403.2840
H41.10752.15633.28401.80481.8048
H51.10752.15633.28401.80481.8048
H61.10752.15633.28401.80481.8048

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 109.797
C2 C1 H5 109.797 C2 C1 H6 109.797
H4 C1 H5 109.143 H4 C1 H6 109.143
H5 C1 H6 109.143
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability