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All results from a given calculation for CH3NCO (methylisocyante)

using model chemistry: QCISD(T)/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 QCISD(T)/cc-pVTZ
 hartrees
Energy at 0K-207.662271
Energy at 298.15K 
HF Energy-206.866461
Nuclear repulsion energy103.812414
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(T)/cc-pVTZ
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A' 3150 2988        
2 A' 3049 2893        
3 A' 2330 2210        
4 A' 1512 1434        
5 A' 1471 1396        
6 A' 1450 1375        
7 A' 1157 1098        
8 A' 891 845        
9 A' 648 615        
10 A' 196 186        
11 A" 3120 2960        
12 A" 1518 1440        
13 A" 1133 1075        
14 A" 583 553        
15 A" 12 12        

Unscaled Zero Point Vibrational Energy (zpe) 11109.4 cm-1
Scaled (by 0.9486) Zero Point Vibrational Energy (zpe) 10538.4 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(T)/cc-pVTZ
ABC
2.39772 0.14685 0.14210

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.390 1.025 0.000
N2 0.000 0.617 0.000
C3 -0.577 -0.446 0.000
O4 -1.265 -1.402 0.000
H5 1.431 2.112 0.000
H6 1.903 0.656 0.889
H7 1.903 0.656 -0.889

Atom - Atom Distances (Å)
  C1 N2 C3 O4 H5 H6 H7
C11.44922.45643.59801.08711.09071.0907
N21.44921.20932.38292.06952.10122.1012
C32.45641.20931.17843.25172.85592.8559
O43.59802.38291.17844.42943.88193.8819
H51.08712.06953.25174.42941.76941.7694
H61.09072.10122.85593.88191.76941.7781
H71.09072.10122.85593.88191.76941.7781

picture of methylisocyante state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 C3 134.844 N2 C1 H5 108.522
N2 C1 H6 110.854 N2 C1 H7 110.854
N2 C3 O4 172.723 H5 C1 H6 108.677
H5 C1 H7 108.677 H6 C1 H7 109.200
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability