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All results from a given calculation for CH3NCO (methylisocyante)

using model chemistry: QCISD/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 QCISD/6-31G*
 hartrees
Energy at 0K-207.396463
Energy at 298.15K 
HF Energy-206.787525
Nuclear repulsion energy103.425503
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*
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' 3178 3026 16.07      
2 A' 3077 2931 41.37      
3 A' 2375 2261 938.76      
4 A' 1548 1474 3.08      
5 A' 1510 1438 19.36      
6 A' 1495 1424 28.25      
7 A' 1182 1125 21.11      
8 A' 904 861 30.57      
9 A' 635 605 31.27      
10 A' 173 165 19.42      
11 A" 3151 3001 21.10      
12 A" 1554 1480 5.28      
13 A" 1156 1101 0.23      
14 A" 578 551 28.67      
15 A" 61 58 2.66      

Unscaled Zero Point Vibrational Energy (zpe) 11288.7 cm-1
Scaled (by 0.9523) Zero Point Vibrational Energy (zpe) 10750.2 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 QCISD/6-31G*
ABC
2.51834 0.14455 0.14037

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.367 1.078 0.000
N2 0.000 0.602 0.000
C3 -0.565 -0.468 0.000
O4 -1.246 -1.439 0.000
H5 1.351 2.170 0.000
H6 1.900 0.732 0.893
H7 1.900 0.732 -0.893

Atom - Atom Distances (Å)
  C1 N2 C3 O4 H5 H6 H7
C11.44782.47433.62781.09281.09591.0959
N21.44781.20992.39092.07022.10342.1034
C32.47431.20991.18573.26072.88312.8831
O43.62782.39091.18574.44633.92513.9251
H51.09282.07023.26074.44631.77961.7796
H61.09592.10342.88313.92511.77961.7869
H71.09592.10342.88313.92511.77961.7869

picture of methylisocyante state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 C3 137.000 N2 C1 H5 108.339
N2 C1 H6 110.808 N2 C1 H7 110.808
N2 C3 O4 172.751 H5 C1 H6 108.802
H5 C1 H7 108.802 H6 C1 H7 109.229
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability