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All results from a given calculation for CH3OCHO (methyl formate)

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-226.939109
Energy at 298.15K-226.943873
HF Energy-226.508772
Nuclear repulsion energy119.339939
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' 3229 3082 11.92      
2 A' 3124 2982 51.46      
3 A' 3108 2967 22.28      
4 A' 1678 1602 138.84      
5 A' 1601 1528 7.52      
6 A' 1517 1448 10.61      
7 A' 1439 1373 1.81      
8 A' 1208 1153 63.38      
9 A' 1160 1107 239.44      
10 A' 897 856 10.03      
11 A' 755 721 10.74      
12 A' 289 276 15.34      
13 A" 3181 3036 22.21      
14 A" 1589 1517 6.73      
15 A" 1192 1138 0.75      
16 A" 1054 1006 0.11      
17 A" 331 316 32.53      
18 A" 92 88 0.02      

Unscaled Zero Point Vibrational Energy (zpe) 13721.0 cm-1
Scaled (by 0.9545) Zero Point Vibrational Energy (zpe) 13096.7 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
0.62367 0.22131 0.16855

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 1.400 0.392 0.000
O2 0.000 0.910 0.000
C3 -0.965 -0.084 0.000
O4 -0.731 -1.298 0.000
H5 2.018 1.288 0.000
H6 1.583 -0.215 0.889
H7 1.583 -0.215 -0.889
H8 -1.948 0.392 0.000

Atom - Atom Distances (Å)
  C1 O2 C3 O4 H5 H6 H7 H8
C11.49222.41182.71931.08781.09221.09223.3479
O21.49221.38462.32502.05292.13562.13562.0159
C32.41181.38461.23633.28252.70162.70161.0922
O42.71932.32501.23633.77322.70502.70502.0821
H51.08782.05293.28253.77321.79891.79894.0659
H61.09222.13562.70162.70501.79891.77853.6915
H71.09222.13562.70162.70501.79891.77853.6915
H83.34792.01591.09222.08214.06593.69153.6915

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 113.885 O2 C1 H5 104.348
O2 C1 H6 110.492 O2 C1 H7 110.492
O2 C3 O4 124.927 O2 C3 H8 108.383
O4 C3 H8 126.690 H5 C1 H6 111.223
H5 C1 H7 111.223 H6 C1 H7 109.013
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at MP2/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C       -0.071
2 O       -0.393
3 C       0.653
4 O       -0.444
5 H       -0.039
6 H       0.082
7 H       0.106
8 H       0.106


Electric dipole moments


Electric Quadrupole moment
Quadrupole components in D Å


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.798 -1.206 0.000
y -1.206 4.068 0.000
z 0.000 0.000 2.301


<r2> (average value of r2) Å2
<r2> 86.175
(<r2>)1/2 9.283