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 CH3NCO (methylisocyante)

using model chemistry: QCISD/Def2TZVPP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes Cs 1A'
Energy calculated at QCISD/Def2TZVPP
 hartrees
Energy at 0K-207.634345
Energy at 298.15K 
HF Energy-206.876757
Nuclear repulsion energy104.222779
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/Def2TZVPP
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A' 3166 3166 13.04      
2 A' 3071 3071 41.62      
3 A' 2352 2352 1108.72      
4 A' 1529 1529 2.49      
5 A' 1496 1496 13.51      
6 A' 1478 1478 37.04      
7 A' 1174 1174 22.78      
8 A' 902 902 28.96      
9 A' 664 664 31.15      
10 A' 173 173 19.68      
11 A" 3141 3141 17.43      
12 A" 1532 1532 6.06      
13 A" 1150 1150 0.39      
14 A" 611 611 23.68      
15 A" 42 42 1.75      

Unscaled Zero Point Vibrational Energy (zpe) 11240.3 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 11240.3 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 QCISD/Def2TZVPP
ABC
2.44872 0.14760 0.14296

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/Def2TZVPP

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.381 1.034 0.000
N2 0.000 0.607 0.000
C3 -0.577 -0.447 0.000
O4 -1.253 -1.404 0.000
H5 1.408 2.119 0.000
H6 1.897 0.672 0.887
H7 1.897 0.672 -0.887

Atom - Atom Distances (Å)
  C1 N2 C3 O4 H5 H6 H7
C11.44502.45453.58891.08581.08891.0889
N21.44501.20152.36962.06632.09542.0954
C32.45451.20151.17203.24422.85642.8564
O43.58892.36961.17204.41553.87553.8755
H51.08582.06633.24424.41551.76721.7672
H61.08892.09542.85643.87551.76721.7749
H71.08892.09542.85643.87551.76721.7749

picture of methylisocyante state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 C3 135.880 N2 C1 H5 108.626
N2 C1 H6 110.786 N2 C1 H7 110.786
N2 C3 O4 173.463 H5 C1 H6 108.706
H5 C1 H7 108.706 H6 C1 H7 109.179
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability