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: B3PW91/6-31G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at B3PW91/6-31G
 hartrees
Energy at 0K-228.892341
Energy at 298.15K-228.897080
Nuclear repulsion energy120.163567
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 B3PW91/6-31G
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' 3229 3093 9.03      
2 A' 3149 3016 41.67      
3 A' 3089 2958 18.41      
4 A' 1728 1655 238.02      
5 A' 1533 1468 10.72      
6 A' 1486 1423 7.79      
7 A' 1401 1342 6.82      
8 A' 1217 1165 138.46      
9 A' 1174 1124 146.87      
10 A' 900 862 14.60      
11 A' 755 723 10.56      
12 A' 280 268 16.90      
13 A" 3183 3048 17.99      
14 A" 1524 1459 13.22      
15 A" 1169 1120 0.56      
16 A" 1026 983 0.13      
17 A" 345 330 38.99      
18 A" 85 81 0.04      

Unscaled Zero Point Vibrational Energy (zpe) 13635.7 cm-1
Scaled (by 0.9577) Zero Point Vibrational Energy (zpe) 13058.9 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 B3PW91/6-31G
ABC
0.65646 0.21858 0.16925

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-31G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.397 0.431 0.000
O2 0.000 0.878 0.000
C3 -0.955 -0.094 0.000
O4 -0.737 -1.303 0.000
H5 1.984 1.346 0.000
H6 1.601 -0.167 0.891
H7 1.601 -0.167 -0.891
H8 -1.943 0.372 0.000

Atom - Atom Distances (Å)
  C1 O2 C3 O4 H5 H6 H7 H8
C11.46702.40992.74951.08731.09201.09203.3404
O21.46701.36242.30152.03822.10892.10892.0074
C32.40991.36241.22793.27252.70752.70751.0923
O42.74952.30151.22793.79722.74772.74772.0635
H51.08732.03823.27253.79721.79731.79734.0453
H61.09202.10892.70752.74771.79731.78243.6933
H71.09202.10892.70752.74771.79731.78243.6933
H83.34042.00741.09232.06354.04533.69333.6933

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 116.756 O2 C1 H5 104.892
O2 C1 H6 110.130 O2 C1 H7 110.130
O2 C3 O4 125.290 O2 C3 H8 109.231
O4 C3 H8 125.479 H5 C1 H6 111.113
H5 C1 H7 111.113 H6 C1 H7 109.393
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.252      
2 O -0.476      
3 C 0.359      
4 O -0.411      
5 H 0.197      
6 H 0.198      
7 H 0.198      
8 H 0.187      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  1.161 1.527 0.000 1.918
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -18.320 -1.165 0.000
y -1.165 -29.218 0.000
z 0.000 0.000 -22.882
Traceless
 xyz
x 7.730 -1.165 0.000
y -1.165 -8.617 0.000
z 0.000 0.000 0.887
Polar
3z2-r21.774
x2-y210.898
xy-1.165
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 0.000 0.000 0.000
y 0.000 0.000 0.000
z 0.000 0.000 0.000


<r2> (average value of r2) Å2
<r2> 73.522
(<r2>)1/2 8.574