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 CH3OCHO (methyl formate)

using model chemistry: MP2/CEP-121G

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/CEP-121G
 hartrees
Energy at 0K-45.009554
Energy at 298.15K-45.014327
HF Energy-44.578953
Nuclear repulsion energy66.136063
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/CEP-121G
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' 3175 3099 15.66      
2 A' 3110 3035 38.16      
3 A' 3008 2936 28.92      
4 A' 1586 1548 226.11      
5 A' 1520 1484 7.28      
6 A' 1472 1436 20.83      
7 A' 1374 1341 4.82      
8 A' 1193 1164 48.73      
9 A' 1122 1095 294.54      
10 A' 850 830 24.08      
11 A' 709 692 12.13      
12 A' 277 270 14.95      
13 A" 3129 3054 29.30      
14 A" 1506 1470 8.36      
15 A" 1156 1129 2.67      
16 A" 975 951 1.32      
17 A" 326 318 41.97      
18 A" 137 134 0.06      

Unscaled Zero Point Vibrational Energy (zpe) 13312.1 cm-1
Scaled (by 0.976) Zero Point Vibrational Energy (zpe) 12992.6 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/CEP-121G
ABC
0.62092 0.21115 0.16253

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-121G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.426 0.429 0.000
O2 0.000 0.908 0.000
C3 -0.979 -0.094 0.000
O4 -0.743 -1.332 0.000
H5 2.011 1.353 0.000
H6 1.612 -0.172 0.900
H7 1.612 -0.172 -0.900
H8 -1.973 0.372 0.000

Atom - Atom Distances (Å)
  C1 O2 C3 O4 H5 H6 H7 H8
C11.50452.46162.79481.09341.09851.09853.3993
O21.50451.40072.36022.06002.13922.13922.0440
C32.46161.40071.26063.32202.74442.74441.0975
O42.79482.36021.26063.84702.77602.77602.1015
H51.09342.06003.32203.84701.81531.81534.1029
H61.09852.13922.74442.77601.81531.80083.7360
H71.09852.13922.74442.77601.81531.80083.7360
H83.39932.04401.09752.10154.10293.73603.7360

picture of methyl formate state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 O2 C3 115.796 O2 C1 H5 103.804
O2 C1 H6 109.546 O2 C1 H7 109.546
O2 C3 O4 124.883 O2 C3 H8 109.205
O4 C3 H8 125.912 H5 C1 H6 111.825
H5 C1 H7 111.825 H6 C1 H7 110.098
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability