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: CCSD(T)/daug-cc-pVTZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes Cs 1A'
Energy calculated at CCSD(T)/daug-cc-pVTZ
 hartrees
Energy at 0K-207.678548
Energy at 298.15K 
HF Energy-206.869718
Nuclear repulsion energy103.767397
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 CCSD(T)/daug-cc-pVTZ
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' 3146 3146        
2 A' 3048 3048        
3 A' 2315 2315        
4 A' 1514 1514        
5 A' 1473 1473        
6 A' 1450 1450        
7 A' 1159 1159        
8 A' 882 882        
9 A' 647 647        
10 A' 178 178        
11 A" 3119 3119        
12 A" 1520 1520        
13 A" 1135 1135        
14 A" 588 588        
15 A" 75 75        

Unscaled Zero Point Vibrational Energy (zpe) 11124.2 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 11124.2 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 CCSD(T)/daug-cc-pVTZ
ABC
2.40411 0.14661 0.14190

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)/daug-cc-pVTZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.391 1.029 0.000
N2 0.000 0.615 0.000
C3 -0.577 -0.447 0.000
O4 -1.264 -1.405 0.000
H5 1.426 2.117 0.000
H6 1.902 0.660 0.890
H7 1.902 0.660 -0.890

Atom - Atom Distances (Å)
  C1 N2 C3 O4 H5 H6 H7
C11.45132.46023.60191.08801.09121.0912
N21.45131.20872.38262.07092.10082.1008
C32.46021.20871.17863.25352.85742.8574
O43.60192.38261.17864.43133.88343.8834
H51.08802.07093.25354.43131.77261.7726
H61.09122.10082.85743.88341.77261.7807
H71.09122.10082.85743.88341.77261.7807

picture of methylisocyante state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 C3 135.104 N2 C1 H5 108.428
N2 C1 H6 110.635 N2 C1 H7 110.635
N2 C3 O4 172.860 H5 C1 H6 108.868
H5 C1 H7 108.868 H6 C1 H7 109.363
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability