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: QCISD/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/cc-pVDZ
 hartrees
Energy at 0K-132.346007
Energy at 298.15K-132.348348
HF Energy-131.902764
Nuclear repulsion energy59.390396
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/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 3085 2959 21.00      
2 A1 2219 2128 125.09      
3 A1 1459 1400 10.28      
4 A1 973 934 16.40      
5 E 3180 3051 7.41      
5 E 3180 3051 7.41      
6 E 1493 1432 8.46      
6 E 1493 1432 8.46      
7 E 1148 1101 0.33      
7 E 1148 1101 0.33      
8 E 256 246 0.38      
8 E 256 246 0.38      

Unscaled Zero Point Vibrational Energy (zpe) 9944.4 cm-1
Scaled (by 0.9594) Zero Point Vibrational Energy (zpe) 9540.7 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 QCISD/cc-pVDZ
ABC
5.17327 0.32882 0.32882

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.120
N2 0.000 0.000 0.313
C3 0.000 0.000 1.500
H4 0.000 1.038 -1.489
H5 0.899 -0.519 -1.489
H6 -0.899 -0.519 -1.489

Atom - Atom Distances (Å)
  C1 N2 C3 H4 H5 H6
C11.43272.61971.10191.10191.1019
N21.43271.18702.07962.07962.0796
C32.61971.18703.16413.16413.1641
H41.10192.07963.16411.79811.7981
H51.10192.07963.16411.79811.7981
H61.10192.07963.16411.79811.7981

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 109.579
N2 C1 H5 109.579 N2 C1 H6 109.579
H4 C1 H5 109.363 H4 C1 H6 109.363
H5 C1 H6 109.363
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability