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All results from a given calculation for CH3NC (methyl isocyanide)

using model chemistry: PBEPBE/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 PBEPBE/3-21G
 hartrees
Energy at 0K-131.811431
Energy at 298.15K-131.813821
Nuclear repulsion energy59.118512
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/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 2990 2962 11.68      
2 A1 2112 2092 71.74      
3 A1 1431 1418 0.31      
4 A1 897 888 10.18      
5 E 3064 3036 7.20      
5 E 3064 3036 7.20      
6 E 1509 1496 14.68      
6 E 1509 1496 14.68      
7 E 1122 1112 0.26      
7 E 1122 1112 0.26      
8 E 286 283 2.46      
8 E 286 283 2.46      

Unscaled Zero Point Vibrational Energy (zpe) 9695.5 cm-1
Scaled (by 0.9909) Zero Point Vibrational Energy (zpe) 9607.2 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 PBEPBE/3-21G
ABC
5.18373 0.32538 0.32538

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.125
N2 0.000 0.000 0.313
C3 0.000 0.000 1.509
H4 0.000 1.037 -1.499
H5 0.898 -0.519 -1.499
H6 -0.898 -0.519 -1.499

Atom - Atom Distances (Å)
  C1 N2 C3 H4 H5 H6
C11.43822.63351.10261.10261.1026
N21.43821.19532.08832.08832.0883
C32.63351.19533.18173.18173.1817
H41.10262.08833.18171.79631.7963
H51.10262.08833.18171.79631.7963
H61.10262.08833.18171.79631.7963

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 109.850
N2 C1 H5 109.850 N2 C1 H6 109.850
H4 C1 H5 109.090 H4 C1 H6 109.090
H5 C1 H6 109.090
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.436      
2 N -0.500      
3 C 0.161      
4 H 0.258      
5 H 0.258      
6 H 0.258      


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 -3.798 3.798
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -17.578 0.000 0.000
y 0.000 -17.578 0.000
z 0.000 0.000 -20.744
Traceless
 xyz
x 1.583 0.000 0.000
y 0.000 1.583 0.000
z 0.000 0.000 -3.166
Polar
3z2-r2-6.333
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 2.566 0.000 0.000
y 0.000 2.566 0.000
z 0.000 0.000 5.134


<r2> (average value of r2) Å2
<r2> 43.544
(<r2>)1/2 6.599