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All results from a given calculation for CH3NCO (methylisocyante)

using model chemistry: QCISD/TZVP

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/TZVP
 hartrees
Energy at 0K-207.519444
Energy at 298.15K 
HF Energy-206.859261
Nuclear repulsion energy104.075316
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/TZVP
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' 3177 3035 15.89      
2 A' 3075 2937 46.24      
3 A' 2365 2259 1116.53      
4 A' 1535 1466 0.51      
5 A' 1505 1438 25.46      
6 A' 1489 1423 31.92      
7 A' 1185 1132 24.74      
8 A' 898 858 32.57      
9 A' 655 626 33.11      
10 A' 170 162 20.47      
11 A" 3146 3005 22.81      
12 A" 1528 1460 5.41      
13 A" 1158 1106 1.11      
14 A" 607 580 29.78      
15 A" 66 63 2.34      

Unscaled Zero Point Vibrational Energy (zpe) 11278.6 cm-1
Scaled (by 0.9553) Zero Point Vibrational Energy (zpe) 10774.5 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/TZVP
ABC
2.47993 0.14682 0.14234

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/TZVP

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.376 1.049 0.000
N2 0.000 0.602 0.000
C3 -0.575 -0.452 0.000
O4 -1.248 -1.415 0.000
H5 1.387 2.137 0.000
H6 1.898 0.692 0.889
H7 1.898 0.692 -0.889

Atom - Atom Distances (Å)
  C1 N2 C3 O4 H5 H6 H7
C11.44642.46163.59911.08761.09121.0912
N21.44641.20112.37182.06842.09752.0975
C32.46161.20111.17433.24842.86612.8661
O43.59912.37181.17434.42213.88893.8889
H51.08762.06843.24844.42211.77151.7715
H61.09122.09752.86613.88891.77151.7784
H71.09122.09752.86613.88891.77151.7784

picture of methylisocyante state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 C3 136.606 N2 C1 H5 108.596
N2 C1 H6 110.723 N2 C1 H7 110.723
N2 C3 O4 173.646 H5 C1 H6 108.799
H5 C1 H7 108.799 H6 C1 H7 109.155
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability