return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for CH3NO (nitrosomethane)

using model chemistry: MP2=FULL/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=FULL/3-21G*
 hartrees
Energy at 0K-168.209959
Energy at 298.15K-168.213500
HF Energy-167.851415
Nuclear repulsion energy67.137223
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=FULL/3-21G*
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' 3202 3035 8.01      
2 A' 3093 2932 1.88      
3 A' 1566 1484 12.87      
4 A' 1439 1364 10.27      
5 A' 1177 1115 6.62      
6 A' 1098 1041 16.47      
7 A' 785 745 14.55      
8 A' 536 508 1.99      
9 A" 3183 3018 7.35      
10 A" 1569 1488 9.55      
11 A" 1012 959 1.11      
12 A" 111 105 2.05      

Unscaled Zero Point Vibrational Energy (zpe) 9385.4 cm-1
Scaled (by 0.948) Zero Point Vibrational Energy (zpe) 8897.3 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=FULL/3-21G*
ABC
1.75558 0.35920 0.31608

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -1.011 -0.535 0.000
N2 0.000 0.627 0.000
O3 1.226 0.143 0.000
H4 -0.475 -1.486 0.000
H5 -1.633 -0.419 0.891
H6 -1.633 -0.419 -0.891

Atom - Atom Distances (Å)
  C1 N2 O3 H4 H5 H6
C11.54062.33731.09141.09301.0930
N21.54061.31792.16612.13452.1345
O32.33731.31792.35523.04703.0470
H41.09142.16612.35521.80941.8094
H51.09302.13453.04701.80941.7820
H61.09302.13453.04701.80941.7820

picture of nitrosomethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 N2 O3 109.458 N2 C1 H4 109.582
N2 C1 H5 107.060 N2 C1 H6 107.060
H4 C1 H5 111.852 H4 C1 H6 111.852
H5 C1 H6 109.211
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability