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: MP2/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2/6-31G*
 hartrees
Energy at 0K-306.743909
Energy at 298.15K 
HF Energy-305.872582
Nuclear repulsion energy243.174183
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 MP2/6-31G*
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' 3250 3065 4.51 58.22 0.71 0.83
2 A' 3210 3027 16.47 64.16 0.74 0.85
3 A' 3129 2951 15.44 24.46 0.26 0.41
4 A' 3128 2950 0.13 147.97 0.02 0.03
5 A' 3119 2941 11.81 98.05 0.01 0.03
6 A' 1829 1725 183.87 5.59 0.35 0.52
7 A' 1581 1491 4.54 1.04 0.75 0.86
8 A' 1562 1473 3.07 22.52 0.75 0.86
9 A' 1537 1449 13.07 14.69 0.74 0.85
10 A' 1483 1398 5.60 5.29 0.75 0.86
11 A' 1458 1374 66.20 2.42 0.75 0.86
12 A' 1432 1351 6.45 2.73 0.64 0.78
13 A' 1316 1241 410.23 0.29 0.66 0.79
14 A' 1175 1108 11.61 7.40 0.18 0.30
15 A' 1115 1052 93.01 3.37 0.67 0.80
16 A' 1046 986 7.94 1.71 0.25 0.40
17 A' 973 918 8.82 2.05 0.29 0.45
18 A' 882 831 11.72 10.31 0.29 0.45
19 A' 648 611 7.71 7.62 0.33 0.50
20 A' 435 411 0.64 0.39 0.71 0.83
21 A' 376 354 9.60 2.61 0.33 0.49
22 A' 199 188 5.04 0.27 0.63 0.77
23 A" 3222 3039 23.79 27.67 0.75 0.86
24 A" 3215 3032 3.26 52.85 0.75 0.86
25 A" 3184 3003 11.67 65.32 0.75 0.86
26 A" 1551 1463 6.04 18.97 0.75 0.86
27 A" 1538 1450 8.91 16.19 0.75 0.86
28 A" 1328 1253 0.28 11.46 0.75 0.86
29 A" 1222 1152 4.56 2.13 0.75 0.86
30 A" 1096 1034 6.09 1.03 0.75 0.86
31 A" 838 790 0.55 0.19 0.75 0.86
32 A" 606 572 5.56 1.45 0.75 0.86
33 A" 281 265 1.04 0.01 0.75 0.86
34 A" 158 149 4.72 0.01 0.75 0.86
35 A" 77 73 0.08 0.34 0.75 0.86
36 A" 65 62 0.74 0.09 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 26633.0 cm-1
Scaled (by 0.943) Zero Point Vibrational Energy (zpe) 25114.9 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 MP2/6-31G*
ABC
0.27806 0.07001 0.05774

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -2.309 0.037 0.000
C2 -0.909 -0.516 0.000
O3 0.000 0.493 0.000
O4 -0.607 -1.697 0.000
C5 1.382 0.059 0.000
C6 2.229 1.311 0.000
H7 -3.021 -0.788 0.000
H8 -2.460 0.663 0.882
H9 -2.460 0.663 -0.882
H10 1.559 -0.561 0.883
H11 1.559 -0.561 -0.883
H12 3.289 1.044 0.000
H13 2.022 1.914 -0.887
H14 2.022 1.914 0.887

Atom - Atom Distances (Å)
  C1 C2 O3 O4 C5 C6 H7 H8 H9 H10 H11 H12 H13 H14
C11.50512.35392.43013.69124.71351.08921.09251.09254.01254.01255.68824.80334.8033
C21.50511.35781.21972.36213.63112.12872.13872.13872.62192.62194.47873.90953.9095
O32.35391.35782.27251.44812.37423.28092.61942.61942.07842.07843.33492.62602.6260
O42.43011.21972.27252.65344.13442.57923.12833.12832.60062.60064.76384.55444.5544
C53.69122.36211.44812.65341.51174.48313.98823.98821.09351.09352.14652.15362.1536
C64.71353.63112.37424.13441.51175.65344.81514.81512.17572.17571.09371.09201.0920
H71.08922.12873.28092.57924.48315.65341.78841.78844.66944.66946.57025.78945.7894
H81.09252.13872.61943.12833.98824.81511.78841.76444.20164.55745.82924.97864.6538
H91.09252.13872.61943.12833.98824.81511.78841.76444.55744.20165.82924.65384.9786
H104.01252.62192.07842.60061.09352.17574.66944.20164.55741.76642.51973.07792.5181
H114.01252.62192.07842.60061.09352.17574.66944.55744.20161.76642.51972.51813.0779
H125.68824.47873.33494.76382.14651.09376.57025.82925.82922.51972.51971.77461.7746
H134.80333.90952.62604.55442.15361.09205.78944.97864.65383.07792.51811.77461.7735
H144.80333.90952.62604.55442.15361.09205.78944.65384.97862.51813.07791.77461.7735

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 110.508 C1 C2 O4 125.891
C2 C1 H7 109.229 C2 C1 H8 109.827
C2 C1 H9 109.827 C2 O3 C5 114.632
O3 C2 O4 123.601 O3 C5 C6 106.651
O3 C5 H10 108.920 O3 C5 H11 108.920
C5 C6 H12 109.913 C5 C6 H13 110.573
C5 C6 H14 110.573 C6 C5 H10 112.265
C6 C5 H11 112.265 H7 C1 H8 110.117
H7 C1 H9 110.117 H8 C1 H9 107.706
H10 C5 H11 107.739 H12 C6 H13 108.568
H12 C6 H14 108.568 H13 C6 H14 108.587
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability