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All results from a given calculation for CH3CN (Acetonitrile)

using model chemistry: QCISD/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 QCISD/3-21G
 hartrees
Energy at 0K-131.501892
Energy at 298.15K-131.504585
HF Energy-131.188105
Nuclear repulsion energy57.746826
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 QCISD/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 3045 2951 3.45      
2 A1 2297 2226 0.13      
3 A1 1495 1449 8.33      
4 A1 892 864 3.18      
5 E 3110 3014 3.58      
5 E 3110 3014 3.58      
6 E 1562 1513 11.34      
6 E 1562 1513 11.34      
7 E 1132 1097 2.11      
7 E 1132 1097 2.11      
8 E 423 410 0.00      
8 E 423 410 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 10089.9 cm-1
Scaled (by 0.9692) Zero Point Vibrational Energy (zpe) 9779.2 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 QCISD/3-21G
ABC
5.24348 0.29932 0.29932

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.195
C2 0.000 0.000 0.283
N3 0.000 0.000 1.456
H4 0.000 1.031 -1.573
H5 0.893 -0.516 -1.573
H6 -0.893 -0.516 -1.573

Atom - Atom Distances (Å)
  C1 C2 N3 H4 H5 H6
C11.47762.65051.09841.09841.0984
C21.47761.17292.12322.12322.1232
N32.65051.17293.19963.19963.1996
H41.09842.12323.19961.78611.7861
H51.09842.12323.19961.78611.7861
H61.09842.12323.19961.78611.7861

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 110.150
C2 C1 H5 110.150 C2 C1 H6 110.150
H4 C1 H5 108.784 H4 C1 H6 108.784
H5 C1 H6 108.784
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability