return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for CH3CN (Acetonitrile)

using model chemistry: MP2/cc-pVQZ

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/cc-pVQZ
 hartrees
Energy at 0K-132.530557
Energy at 298.15K-132.533121
HF Energy-131.980227
Nuclear repulsion energy58.376191
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/cc-pVQZ
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 3102 2942 1.91 172.15 0.00 0.00
2 A1 2223 2108 0.08 42.66 0.20 0.33
3 A1 1418 1345 1.51 3.60 0.44 0.62
4 A1 937 889 0.96 5.30 0.08 0.15
5 E 3197 3032 0.10 51.65 0.75 0.86
5 E 3197 3032 0.10 51.65 0.75 0.86
6 E 1495 1418 10.33 5.54 0.75 0.86
6 E 1495 1418 10.33 5.54 0.75 0.86
7 E 1065 1010 1.57 0.04 0.75 0.86
7 E 1065 1010 1.57 0.04 0.75 0.86
8 E 362 344 0.47 1.67 0.75 0.86
8 E 362 344 0.47 1.67 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 9960.1 cm-1
Scaled (by 0.9484) Zero Point Vibrational Energy (zpe) 9446.2 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/cc-pVQZ
ABC
5.35576 0.30641 0.30641

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/cc-pVQZ

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.180
C2 0.000 0.000 0.275
N3 0.000 0.000 1.441
H4 0.000 1.020 -1.551
H5 0.884 -0.510 -1.551
H6 -0.884 -0.510 -1.551

Atom - Atom Distances (Å)
  C1 C2 N3 H4 H5 H6
C11.45502.62111.08551.08551.0855
C21.45501.16612.09132.09132.0913
N32.62111.16613.16083.16083.1608
H41.08552.09133.16081.76721.7672
H51.08552.09133.16081.76721.7672
H61.08552.09133.16081.76721.7672

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 109.959
C2 C1 H5 109.959 C2 C1 H6 109.959
H4 C1 H5 108.979 H4 C1 H6 108.979
H5 C1 H6 108.979
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability