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 CH3NC (methyl isocyanide)

using model chemistry: B3PW91/6-31G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at B3PW91/6-31G**
 hartrees
Energy at 0K-132.664409
Energy at 298.15K-132.666815
Nuclear repulsion energy59.973276
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 B3PW91/6-31G**
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 3063 2936 17.90      
2 A1 2258 2164 115.31      
3 A1 1459 1398 3.38      
4 A1 985 944 11.43      
5 E 3149 3018 7.12      
5 E 3149 3018 7.12      
6 E 1495 1433 9.96      
6 E 1495 1433 9.96      
7 E 1146 1098 0.01      
7 E 1146 1098 0.01      
8 E 284 272 0.97      
8 E 284 272 0.97      

Unscaled Zero Point Vibrational Energy (zpe) 9955.3 cm-1
Scaled (by 0.9584) Zero Point Vibrational Energy (zpe) 9541.2 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 B3PW91/6-31G**
ABC
5.28403 0.33556 0.33556

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-31G**

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.106
N2 0.000 0.000 0.309
C3 0.000 0.000 1.486
H4 0.000 1.027 -1.480
H5 0.890 -0.514 -1.480
H6 -0.890 -0.514 -1.480

Atom - Atom Distances (Å)
  C1 N2 C3 H4 H5 H6
C11.41412.59131.09351.09351.0935
N21.41411.17722.06292.06292.0629
C32.59131.17723.13903.13903.1390
H41.09352.06293.13901.77921.7792
H51.09352.06293.13901.77921.7792
H61.09352.06293.13901.77921.7792

picture of methyl isocyanide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 C3 180.000 N2 C1 H4 110.046
N2 C1 H5 110.046 N2 C1 H6 110.046
H4 C1 H5 108.890 H4 C1 H6 108.890
H5 C1 H6 108.890
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.261      
2 N -0.228      
3 C -0.048      
4 H 0.179      
5 H 0.179      
6 H 0.179      


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 -3.667 3.667
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -17.362 0.000 0.000
y 0.000 -17.362 0.000
z 0.000 0.000 -20.684
Traceless
 xyz
x 1.661 0.000 0.000
y 0.000 1.661 0.000
z 0.000 0.000 -3.323
Polar
3z2-r2-6.645
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 2.821 0.000 0.000
y 0.000 2.821 0.000
z 0.000 0.000 5.320


<r2> (average value of r2) Å2
<r2> 42.520
(<r2>)1/2 6.521