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All results from a given calculation for CH3NCO (methylisocyante)

using model chemistry: QCISD/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 QCISD/3-21G
 hartrees
Energy at 0K-206.053397
Energy at 298.15K 
HF Energy-205.621366
Nuclear repulsion energy102.212595
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/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' 3118 3022 16.41      
2 A' 3029 2936 33.99      
3 A' 2339 2267 707.67      
4 A' 1574 1526 6.15      
5 A' 1513 1466 35.65      
6 A' 1429 1385 10.23      
7 A' 1176 1139 16.12      
8 A' 818 793 35.45      
9 A' 570 553 27.57      
10 A' 159 154 18.33      
11 A" 3085 2990 21.34      
12 A" 1584 1536 6.50      
13 A" 1163 1127 0.11      
14 A" 517 502 26.76      
15 A" 63 61 4.68      

Unscaled Zero Point Vibrational Energy (zpe) 11068.1 cm-1
Scaled (by 0.9692) Zero Point Vibrational Energy (zpe) 10727.2 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/3-21G
ABC
3.02361 0.13710 0.13453

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.282 1.257 0.000
N2 0.000 0.545 0.000
C3 -0.519 -0.541 0.000
O4 -1.173 -1.556 0.000
H5 1.080 2.334 0.000
H6 1.864 1.001 0.896
H7 1.864 1.001 -0.896

Atom - Atom Distances (Å)
  C1 N2 C3 O4 H5 H6 H7
C11.46622.54453.73391.09511.09891.0989
N21.46621.20332.40672.08952.11792.1179
C32.54451.20331.20823.28922.97642.9764
O43.73392.40671.20824.49564.07044.0704
H51.09512.08953.28924.49561.78681.7868
H61.09892.11792.97644.07041.78681.7915
H71.09892.11792.97644.07041.78681.7915

picture of methylisocyante state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 C3 144.616 N2 C1 H5 108.469
N2 C1 H6 110.499 N2 C1 H7 110.499
N2 C3 O4 172.774 H5 C1 H6 109.066
H5 C1 H7 109.066 H6 C1 H7 109.209
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability