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All results from a given calculation for CH3NCO (methylisocyante)

using model chemistry: QCISD/6-31G(2df,p)

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/6-31G(2df,p)
 hartrees
Energy at 0K-207.539753
Energy at 298.15K 
HF Energy-206.813748
Nuclear repulsion energy104.092305
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/6-31G(2df,p)
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' 3188 3020 11.65      
2 A' 3091 2929 36.69      
3 A' 2392 2266 984.35      
4 A' 1537 1456 2.31      
5 A' 1508 1428 10.20      
6 A' 1489 1411 39.32      
7 A' 1177 1115 20.77      
8 A' 904 857 27.89      
9 A' 668 633 30.52      
10 A' 168 159 18.95      
11 A" 3166 3000 15.11      
12 A" 1539 1458 5.09      
13 A" 1154 1094 0.19      
14 A" 620 587 25.41      
15 A" 46 44 1.94      

Unscaled Zero Point Vibrational Energy (zpe) 11324.1 cm-1
Scaled (by 0.9474) Zero Point Vibrational Energy (zpe) 10728.4 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/6-31G(2df,p)
ABC
2.51693 0.14660 0.14226

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/6-31G(2df,p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.368 1.060 0.000
N2 0.000 0.599 0.000
C3 -0.570 -0.460 0.000
O4 -1.243 -1.420 0.000
H5 1.368 2.149 0.000
H6 1.897 0.711 0.889
H7 1.897 0.711 -0.889

Atom - Atom Distances (Å)
  C1 N2 C3 O4 H5 H6 H7
C11.44332.46243.60101.08951.09211.0921
N21.44331.20232.37122.06762.09802.0980
C32.46241.20231.17303.25002.87172.8717
O43.60102.37121.17304.42273.89793.8979
H51.08952.06763.25004.42271.77171.7717
H61.09212.09802.87173.89791.77171.7789
H71.09212.09802.87173.89791.77171.7789

picture of methylisocyante state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 C3 136.922 N2 C1 H5 108.642
N2 C1 H6 110.927 N2 C1 H7 110.927
N2 C3 O4 173.265 H5 C1 H6 108.608
H5 C1 H7 108.608 H6 C1 H7 109.068
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability