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All results from a given calculation for CH3NCO (methylisocyante)

using model chemistry: CISD/3-21G*

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/3-21G*
 hartrees
Energy at 0K-206.001327
Energy at 298.15K 
HF Energy-205.624890
Nuclear repulsion energy102.948536
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/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 A' 3200 2990 16.10      
2 A' 3113 2909 32.15      
3 A' 2457 2296 927.89      
4 A' 1610 1505 6.19      
5 A' 1556 1454 37.88      
6 A' 1502 1403 8.19      
7 A' 1209 1130 13.70      
8 A' 838 783 46.40      
9 A' 585 546 37.26      
10 A' 132 123 18.46      
11 A" 3171 2963 20.54      
12 A" 1620 1513 7.19      
13 A" 1198 1119 0.17      
14 A" 552 516 37.24      
15 A" 48 45 6.47      

Unscaled Zero Point Vibrational Energy (zpe) 11394.8 cm-1
Scaled (by 0.9344) Zero Point Vibrational Energy (zpe) 10647.3 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 CISD/3-21G*
ABC
3.53167 0.13670 0.13497

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.150 1.386 0.000
N2 0.000 0.499 0.000
C3 -0.470 -0.592 0.000
O4 -1.051 -1.639 0.000
H5 0.800 2.416 0.000
H6 1.760 1.217 0.890
H7 1.760 1.217 -0.890

Atom - Atom Distances (Å)
  C1 N2 C3 O4 H5 H6 H7
C11.45222.55623.74041.08871.09211.0921
N21.45221.18772.38212.07712.09922.0992
C32.55621.18771.19743.26473.00613.0061
O43.74042.38211.19744.45714.10474.1047
H51.08872.07713.26474.45711.77571.7757
H61.09212.09923.00614.10471.77571.7803
H71.09212.09923.00614.10471.77571.7803

picture of methylisocyante state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 C3 150.909 N2 C1 H5 108.817
N2 C1 H6 110.382 N2 C1 H7 110.382
N2 C3 O4 174.285 H5 C1 H6 109.024
H5 C1 H7 109.024 H6 C1 H7 109.184
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability