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All results from a given calculation for CH3NCO (methylisocyante)

using model chemistry: MP2/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes Cs 1A'
Energy calculated at MP2/3-21G*
 hartrees
Energy at 0K-206.044417
Energy at 298.15K 
HF Energy-205.619320
Nuclear repulsion energy102.012330
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 MP2/3-21G*
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' 3187 3032 13.59 76.01 0.64 0.78
2 A' 3088 2938 34.26 120.15 0.01 0.03
3 A' 2355 2240 553.88 1.25 0.24 0.39
4 A' 1600 1522 7.42 22.87 0.75 0.86
5 A' 1531 1456 32.57 19.59 0.57 0.73
6 A' 1418 1349 23.96 29.08 0.28 0.44
7 A' 1189 1131 15.21 4.33 0.64 0.78
8 A' 819 779 29.23 15.82 0.24 0.38
9 A' 579 550 17.73 0.91 0.24 0.38
10 A' 189 180 17.41 1.54 0.75 0.86
11 A" 3153 2999 19.01 60.21 0.75 0.86
12 A" 1608 1530 6.64 27.77 0.75 0.86
13 A" 1178 1120 0.00 3.61 0.75 0.86
14 A" 515 490 16.53 0.39 0.75 0.86
15 A" 81 77 3.90 1.63 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 11243.6 cm-1
Scaled (by 0.9513) Zero Point Vibrational Energy (zpe) 10696.1 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 MP2/3-21G*
ABC
2.78979 0.13798 0.13485

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/3-21G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.335 1.188 0.000
N2 0.000 0.575 0.000
C3 -0.537 -0.516 0.000
O4 -1.224 -1.513 0.000
H5 1.213 2.271 0.000
H6 1.896 0.890 0.892
H7 1.896 0.890 -0.892

Atom - Atom Distances (Å)
  C1 N2 C3 O4 H5 H6 H7
C11.46952.53173.72101.09061.09451.0945
N21.46951.21572.42012.08592.11872.1187
C32.53171.21571.21083.29142.94832.9483
O43.72102.42011.21084.50144.03804.0380
H51.09062.08593.29144.50141.78011.7801
H61.09452.11872.94834.03801.78011.7843
H71.09452.11872.94834.03801.78011.7843

picture of methylisocyante state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 C3 140.889 N2 C1 H5 108.218
N2 C1 H6 110.593 N2 C1 H7 110.593
N2 C3 O4 171.669 H5 C1 H6 109.104
H5 C1 H7 109.104 H6 C1 H7 109.195
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability