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

using model chemistry: HF/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 HF/3-21G
 hartrees
Energy at 0K-226.514275
Energy at 298.15K-226.519209
Nuclear repulsion energy121.801379
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 HF/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' 3346 3030 15.61      
2 A' 3310 2998 51.25      
3 A' 3238 2933 19.38      
4 A' 1914 1734 271.90      
5 A' 1680 1521 9.10      
6 A' 1622 1469 5.02      
7 A' 1538 1393 6.49      
8 A' 1330 1205 311.38      
9 A' 1287 1166 124.85      
10 A' 983 891 18.95      
11 A' 827 749 17.40      
12 A' 299 271 21.58      
13 A" 3306 2994 25.77      
14 A" 1669 1512 8.11      
15 A" 1278 1157 1.46      
16 A" 1183 1071 3.18      
17 A" 331 300 53.45      
18 A" 125 113 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 14634.1 cm-1
Scaled (by 0.9056) Zero Point Vibrational Energy (zpe) 13252.6 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 HF/3-21G
ABC
0.68097 0.22285 0.17329

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.391 0.426 0.000
O2 0.000 0.855 0.000
C3 -0.951 -0.095 0.000
O4 -0.735 -1.275 0.000
H5 1.967 1.335 0.000
H6 1.601 -0.162 0.880
H7 1.601 -0.162 -0.880
H8 -1.925 0.363 0.000

Atom - Atom Distances (Å)
  C1 O2 C3 O4 H5 H6 H7 H8
C11.45542.39922.72351.07561.07941.07943.3164
O21.45541.34362.25322.02492.09072.09071.9867
C32.39921.34361.20013.24942.70002.70001.0757
O42.72352.25321.20013.75712.73322.73322.0240
H51.07562.02493.24943.75711.77491.77494.0116
H61.07942.09072.70002.73321.77491.76003.6714
H71.07942.09072.70002.73321.77491.76003.6714
H83.31641.98671.07572.02404.01163.67143.6714

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 117.948 O2 C1 H5 105.282
O2 C1 H6 110.254 O2 C1 H7 110.254
O2 C3 O4 124.599 O2 C3 H8 109.913
O4 C3 H8 125.488 H5 C1 H6 110.892
H5 C1 H7 110.892 H6 C1 H7 109.222
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.286 0.129    
2 O -0.688 -0.574    
3 C 0.648 0.909    
4 O -0.586 -0.618    
5 H 0.230 0.062    
6 H 0.223 0.070    
7 H 0.223 0.070    
8 H 0.236 -0.047    


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.945 1.523 0.000 1.792
CHELPG 0.995 1.488 0.000 1.790
AIM        
ESP 0.989 1.488 0.000 1.787


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -17.894 -1.321 0.000
y -1.321 -29.616 0.000
z 0.000 0.000 -22.803
Traceless
 xyz
x 8.316 -1.321 0.000
y -1.321 -9.268 0.000
z 0.000 0.000 0.952
Polar
3z2-r21.904
x2-y211.722
xy-1.321
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.855 0.247 0.000
y 0.247 3.724 0.000
z 0.000 0.000 2.233


<r2> (average value of r2) Å2
<r2> 72.207
(<r2>)1/2 8.497