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: B3PW91/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at B3PW91/3-21G
 hartrees
Energy at 0K-131.973230
Energy at 298.15K-131.975996
HF Energy-131.973230
Nuclear repulsion energy58.314593
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 B3PW91/3-21G
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 3067 2948 1.11      
2 A1 2363 2271 3.34      
3 A1 1474 1417 17.70      
4 A1 939 902 1.54      
5 E 3139 3018 0.73      
5 E 3139 3018 0.73      
6 E 1537 1477 16.20      
6 E 1537 1477 16.20      
7 E 1118 1074 6.35      
7 E 1118 1074 6.35      
8 E 461 444 0.23      
8 E 461 444 0.23      

Unscaled Zero Point Vibrational Energy (zpe) 10176.1 cm-1
Scaled (by 0.9612) Zero Point Vibrational Energy (zpe) 9781.3 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 B3PW91/3-21G
ABC
5.28045 0.30657 0.30657

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/3-21G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.177
C2 0.000 0.000 0.276
N3 0.000 0.000 1.440
H4 0.000 1.028 -1.558
H5 0.890 -0.514 -1.558
H6 -0.890 -0.514 -1.558

Atom - Atom Distances (Å)
  C1 C2 N3 H4 H5 H6
C11.45272.61701.09611.09611.0961
C21.45271.16432.10232.10232.1023
N32.61701.16433.16963.16963.1696
H41.09612.10233.16961.77981.7798
H51.09612.10233.16961.77981.7798
H61.09612.10233.16961.77981.7798

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 110.362
C2 C1 H5 110.362 C2 C1 H6 110.362
H4 C1 H5 108.565 H4 C1 H6 108.565
H5 C1 H6 108.565
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.678      
2 C 0.338      
3 N -0.490      
4 H 0.277      
5 H 0.277      
6 H 0.277      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 -3.681 3.681
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -17.316 0.000 0.000
y 0.000 -17.316 0.000
z 0.000 0.000 -20.328
Traceless
 xyz
x 1.506 0.000 0.000
y 0.000 1.506 0.000
z 0.000 0.000 -3.012
Polar
3z2-r2-6.024
x2-y20.000
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.309 0.000 0.000
y 0.000 2.309 0.000
z 0.000 0.000 4.656


<r2> (average value of r2) Å2
<r2> 45.179
(<r2>)1/2 6.722