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All results from a given calculation for CH3CN (Acetonitrile)

using model chemistry: MP2/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at MP2/3-21G*
 hartrees
Energy at 0K-131.488536
Energy at 298.15K-131.491222
HF Energy-131.185775
Nuclear repulsion energy57.590313
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 MP2/3-21G*
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 3100 2949 2.37      
2 A1 2159 2054 3.50      
3 A1 1513 1439 8.11      
4 A1 896 853 1.90      
5 E 3172 3018 2.27      
5 E 3172 3018 2.27      
6 E 1585 1508 11.78      
6 E 1585 1508 11.78      
7 E 1147 1091 2.57      
7 E 1147 1091 2.57      
8 E 419 398 0.03      
8 E 419 398 0.03      

Unscaled Zero Point Vibrational Energy (zpe) 10156.1 cm-1
Scaled (by 0.9513) Zero Point Vibrational Energy (zpe) 9661.5 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 MP2/3-21G*
ABC
5.28636 0.29783 0.29783

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/3-21G*

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.196
C2 0.000 0.000 0.276
N3 0.000 0.000 1.463
H4 0.000 1.027 -1.574
H5 0.889 -0.513 -1.574
H6 -0.889 -0.513 -1.574

Atom - Atom Distances (Å)
  C1 C2 N3 H4 H5 H6
C11.47232.65891.09451.09451.0945
C21.47231.18662.11652.11652.1165
N32.65891.18663.20623.20623.2062
H41.09452.11653.20621.77881.7788
H51.09452.11653.20621.77881.7788
H61.09452.11653.20621.77881.7788

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 110.226
C2 C1 H5 110.226 C2 C1 H6 110.226
H4 C1 H5 108.706 H4 C1 H6 108.706
H5 C1 H6 108.706
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability