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All results from a given calculation for CH3NCO (methylisocyante)

using model chemistry: CISD/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes Cs 1A'
Energy calculated at CISD/6-31G*
 hartrees
Energy at 0K-207.314658
Energy at 298.15K 
HF Energy-206.790144
Nuclear repulsion energy104.182785
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 CISD/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 A' 3268 3026 15.99      
2 A' 3166 2931 40.12      
3 A' 2471 2288 1215.74      
4 A' 1596 1478 1.31      
5 A' 1570 1453 9.90      
6 A' 1546 1432 42.63      
7 A' 1216 1126 22.81      
8 A' 925 857 37.13      
9 A' 666 617 41.04      
10 A' 160 148 21.31      
11 A" 3241 3001 20.75      
12 A" 1595 1477 5.52      
13 A" 1191 1102 0.37      
14 A" 622 576 38.07      
15 A" 50 47 3.12      

Unscaled Zero Point Vibrational Energy (zpe) 11642.0 cm-1
Scaled (by 0.9258) Zero Point Vibrational Energy (zpe) 10778.1 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 CISD/6-31G*
ABC
2.70893 0.14521 0.14150

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.333 1.120 0.000
N2 0.000 0.576 0.000
C3 -0.556 -0.483 0.000
O4 -1.210 -1.457 0.000
H5 1.264 2.203 0.000
H6 1.878 0.803 0.887
H7 1.878 0.803 -0.887

Atom - Atom Distances (Å)
  C1 N2 C3 O4 H5 H6 H7
C11.43932.47703.62051.08551.08851.0885
N21.43931.19622.36632.06022.08932.0893
C32.47701.19621.17363.24452.89202.8920
O43.62052.36631.17364.41813.92853.9285
H51.08552.06023.24454.41811.76761.7676
H61.08852.08932.89203.92851.76761.7749
H71.08852.08932.89203.92851.76761.7749

picture of methylisocyante state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 C3 139.877 N2 C1 H5 108.561
N2 C1 H6 110.714 N2 C1 H7 110.714
N2 C3 O4 173.766 H5 C1 H6 108.788
H5 C1 H7 108.788 H6 C1 H7 109.227
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability