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All results from a given calculation for CH3CN (Acetonitrile)

using model chemistry: CISD/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at CISD/6-31G*
 hartrees
Energy at 0K-132.311014
Energy at 298.15K-132.313632
HF Energy-131.926269
Nuclear repulsion energy58.406117
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 CISD/6-31G*
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 3162 2927 2.84      
2 A1 2462 2279 4.16      
3 A1 1497 1386 2.62      
4 A1 962 891 4.15      
5 E 3248 3007 1.78      
5 E 3248 3007 1.78      
6 E 1556 1441 10.71      
6 E 1556 1441 10.71      
7 E 1115 1033 2.10      
7 E 1115 1033 2.10      
8 E 384 355 0.88      
8 E 384 355 0.88      

Unscaled Zero Point Vibrational Energy (zpe) 10343.7 cm-1
Scaled (by 0.9258) Zero Point Vibrational Energy (zpe) 9576.2 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 CISD/6-31G*
ABC
5.32298 0.30619 0.30619

See section I.F.4 to change rotational constant units
Geometric Data calculated at CISD/6-31G*

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.183
C2 0.000 0.000 0.282
N3 0.000 0.000 1.438
H4 0.000 1.023 -1.554
H5 0.886 -0.512 -1.554
H6 -0.886 -0.512 -1.554

Atom - Atom Distances (Å)
  C1 C2 N3 H4 H5 H6
C11.46492.62061.08881.08881.0888
C21.46491.15572.10232.10232.1023
N32.62061.15573.16223.16223.1622
H41.08882.10233.16221.77271.7727
H51.08882.10233.16221.77271.7727
H61.08882.10233.16221.77271.7727

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 109.946
C2 C1 H5 109.946 C2 C1 H6 109.946
H4 C1 H5 108.992 H4 C1 H6 108.992
H5 C1 H6 108.992
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability