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 C4H8O2 (Ethyl acetate)

using model chemistry: HF/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 HF/6-31G
 hartrees
Energy at 0K-305.731937
Energy at 298.15K 
HF Energy-305.731937
Nuclear repulsion energy243.063160
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/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' 3337 3013 8.84 68.31 0.69 0.81
2 A' 3277 2959 38.43 62.39 0.72 0.84
3 A' 3248 2933 8.72 112.15 0.15 0.26
4 A' 3222 2909 2.78 118.84 0.01 0.02
5 A' 3204 2893 22.55 110.68 0.03 0.06
6 A' 1894 1710 286.09 4.01 0.70 0.82
7 A' 1683 1519 5.73 4.94 0.74 0.85
8 A' 1657 1496 5.35 24.36 0.74 0.85
9 A' 1624 1466 20.53 17.57 0.75 0.86
10 A' 1588 1433 6.55 2.72 0.73 0.84
11 A' 1580 1427 49.78 2.89 0.73 0.85
12 A' 1557 1406 0.33 4.06 0.50 0.67
13 A' 1420 1282 547.68 0.69 0.75 0.85
14 A' 1250 1129 16.22 9.09 0.18 0.30
15 A' 1186 1071 119.18 2.63 0.71 0.83
16 A' 1120 1011 13.27 5.23 0.43 0.60
17 A' 1023 923 13.07 2.16 0.57 0.73
18 A' 916 827 15.91 14.60 0.30 0.46
19 A' 685 619 14.66 9.33 0.34 0.50
20 A' 453 409 1.31 0.52 0.65 0.79
21 A' 386 348 13.37 3.05 0.34 0.51
22 A' 194 175 8.27 0.38 0.70 0.82
23 A" 3311 2990 52.79 4.19 0.75 0.86
24 A" 3293 2973 5.84 63.39 0.75 0.86
25 A" 3282 2964 2.28 108.37 0.75 0.86
26 A" 1643 1483 6.68 22.44 0.75 0.86
27 A" 1631 1473 10.92 20.04 0.75 0.86
28 A" 1424 1286 0.45 13.92 0.75 0.86
29 A" 1303 1176 9.07 2.13 0.75 0.86
30 A" 1201 1085 14.76 1.38 0.75 0.86
31 A" 905 817 0.21 0.14 0.75 0.86
32 A" 652 589 18.28 2.07 0.75 0.86
33 A" 269 243 2.43 0.01 0.75 0.86
34 A" 157 142 9.75 0.00 0.75 0.86
35 A" 102 92 0.33 0.12 0.75 0.86
36 A" 62 56 0.94 0.28 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 27868.9 cm-1
Scaled (by 0.9029) Zero Point Vibrational Energy (zpe) 25162.8 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/6-31G
ABC
0.27986 0.06892 0.05703

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -2.303 -0.071 0.000
C2 -0.898 -0.574 0.000
O3 0.000 0.430 0.000
O4 -0.567 -1.742 0.000
C5 1.426 0.139 0.000
C6 2.141 1.471 0.000
H7 -2.989 -0.902 0.000
H8 -2.471 0.546 0.873
H9 -2.471 0.546 -0.873
H10 1.654 -0.450 0.875
H11 1.654 -0.450 -0.875
H12 3.214 1.317 0.000
H13 1.876 2.047 -0.877
H14 1.876 2.047 0.877

Atom - Atom Distances (Å)
  C1 C2 O3 O4 C5 C6 H7 H8 H9 H10 H11 H12 H13 H14
C11.49272.35692.40973.73484.70361.07791.08211.08214.07084.07085.68884.76614.7661
C21.49271.34691.21362.43073.66272.11682.11952.11952.70092.70094.52583.91553.9155
O32.35691.34692.24441.45512.38043.27242.62322.62322.06822.06823.33402.62712.6271
O42.40971.21362.24442.74034.20152.56353.10203.10202.71442.71444.86324.59214.5921
C53.73482.43071.45512.74031.51154.53604.01404.01401.07991.07992.14122.14702.1470
C64.70363.66272.38044.20151.51155.65214.78384.78382.16662.16661.08401.08201.0820
H71.07792.11683.27242.56354.53605.65211.76881.76884.74674.74676.58795.75605.7560
H81.08212.11952.62323.10204.01404.78381.76881.74604.24394.58995.80284.92024.5984
H91.08212.11952.62323.10204.01404.78381.76881.74604.58994.24395.80284.59844.9202
H104.07082.70092.06822.71441.07992.16664.74674.24394.58991.75082.51443.05852.5066
H114.07082.70092.06822.71441.07992.16664.74674.58994.24391.75082.51442.50663.0585
H125.68884.52583.33404.86322.14121.08406.58795.80285.80282.51442.51441.75821.7582
H134.76613.91552.62714.59212.14701.08205.75604.92024.59843.05852.50661.75821.7542
H144.76613.91552.62714.59212.14701.08205.75604.59844.92022.50663.05851.75821.7542

picture of Ethyl acetate state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 O3 112.094 C1 C2 O4 125.535
C2 C1 H7 109.810 C2 C1 H8 109.776
C2 C1 H9 109.776 C2 O3 C5 120.286
O3 C2 O4 122.370 O3 C5 C6 106.710
O3 C5 H10 108.444 O3 C5 H11 108.444
C5 C6 H12 110.075 C5 C6 H13 110.664
C5 C6 H14 110.664 C6 C5 H10 112.389
C6 C5 H11 112.389 H7 C1 H8 109.945
H7 C1 H9 109.945 H8 C1 H9 107.557
H10 C5 H11 108.322 H12 C6 H13 108.525
H12 C6 H14 108.525 H13 C6 H14 108.321
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.510      
2 C 0.754      
3 O -0.727      
4 O -0.571      
5 C 0.029      
6 C -0.460      
7 H 0.203      
8 H 0.202      
9 H 0.202      
10 H 0.185      
11 H 0.185      
12 H 0.158      
13 H 0.175      
14 H 0.175      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.261 2.292 0.000 2.307
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -29.139 -0.736 0.000
y -0.736 -45.276 0.000
z 0.000 0.000 -35.799
Traceless
 xyz
x 11.398 -0.736 0.000
y -0.736 -12.806 0.000
z 0.000 0.000 1.408
Polar
3z2-r22.817
x2-y216.136
xy-0.736
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 7.388 0.344 0.000
y 0.344 7.000 0.000
z 0.000 0.000 5.229


<r2> (average value of r2) Å2
<r2> 203.235
(<r2>)1/2 14.256