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: PBEPBE/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 PBEPBE/6-31G*
 hartrees
Energy at 0K-132.541946
Energy at 298.15K-132.544312
Nuclear repulsion energy59.533598
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 PBEPBE/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 2993 2951 17.41      
2 A1 2169 2138 91.51      
3 A1 1427 1407 2.61      
4 A1 957 944 7.51      
5 E 3071 3027 7.24      
5 E 3071 3027 7.24      
6 E 1467 1446 9.91      
6 E 1467 1446 9.91      
7 E 1119 1103 0.09      
7 E 1119 1103 0.09      
8 E 276 272 0.70      
8 E 276 272 0.70      

Unscaled Zero Point Vibrational Energy (zpe) 9706.5 cm-1
Scaled (by 0.9857) Zero Point Vibrational Energy (zpe) 9567.7 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 PBEPBE/6-31G*
ABC
5.19967 0.33105 0.33105

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.112
N2 0.000 0.000 0.308
C3 0.000 0.000 1.497
H4 0.000 1.036 -1.491
H5 0.897 -0.518 -1.491
H6 -0.897 -0.518 -1.491

Atom - Atom Distances (Å)
  C1 N2 C3 H4 H5 H6
C11.41952.60901.10271.10271.1027
N21.41951.18952.07532.07532.0753
C32.60901.18953.16243.16243.1624
H41.10272.07533.16241.79361.7936
H51.10272.07533.16241.79361.7936
H61.10272.07533.16241.79361.7936

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 110.103
N2 C1 H5 110.103 N2 C1 H6 110.103
H4 C1 H5 108.832 H4 C1 H6 108.832
H5 C1 H6 108.832
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.391      
2 N -0.161      
3 C -0.075      
4 H 0.209      
5 H 0.209      
6 H 0.209      


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 -3.676 3.676
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -17.424 0.000 0.000
y 0.000 -17.424 0.000
z 0.000 0.000 -20.847
Traceless
 xyz
x 1.712 0.000 0.000
y 0.000 1.712 0.000
z 0.000 0.000 -3.424
Polar
3z2-r2-6.848
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 2.831 0.000 0.000
y 0.000 2.831 0.000
z 0.000 0.000 5.525


<r2> (average value of r2) Å2
<r2> 43.009
(<r2>)1/2 6.558