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: QCISD(T)/aug-cc-pVDZ

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(T)/aug-cc-pVDZ
 hartrees
Energy at 0K-132.423153
Energy at 298.15K-132.425677
HF Energy-131.939287
Nuclear repulsion energy57.548713
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(T)/aug-cc-pVDZ
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 3047 2980        
2 A1 2257 2207        
3 A1 1386 1356        
4 A1 915 894        
5 E 3138 3069        
5 E 3138 3069        
6 E 1458 1426        
6 E 1458 1426        
7 E 1043 1019        
7 E 1042 1019        
8 E 350 342        
8 E 349 342        

Unscaled Zero Point Vibrational Energy (zpe) 9790.8 cm-1
Scaled (by 0.9778) Zero Point Vibrational Energy (zpe) 9573.4 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(T)/aug-cc-pVDZ
ABC
5.17439 0.29764 0.29764

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(T)/aug-cc-pVDZ

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.200
C2 0.000 0.000 0.282
N3 0.000 0.000 1.460
H4 0.000 1.038 -1.572
H5 0.899 -0.519 -1.572
H6 -0.899 -0.519 -1.572

Atom - Atom Distances (Å)
  C1 C2 N3 H4 H5 H6
C11.48132.65971.10271.10271.1027
C21.48131.17852.12422.12422.1242
N32.65971.17853.20463.20463.2046
H41.10272.12423.20461.79791.7979
H51.10272.12423.20461.79791.7979
H61.10272.12423.20461.79791.7979

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 109.720
C2 C1 H5 109.720 C2 C1 H6 109.720
H4 C1 H5 109.222 H4 C1 H6 109.222
H5 C1 H6 109.222
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability