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: QCISD/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 QCISD/6-31G
 hartrees
Energy at 0K-306.386048
Energy at 298.15K 
HF Energy-305.724446
Nuclear repulsion energy238.399684
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 QCISD/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' 3144 3030 9.41      
2 A' 3096 2983 27.90      
3 A' 3044 2933 11.67      
4 A' 3038 2927 3.73      
5 A' 3022 2912 18.20      
6 A' 1698 1636 157.37      
7 A' 1567 1510 4.58      
8 A' 1550 1493 4.72      
9 A' 1532 1476 19.78      
10 A' 1474 1421 6.81      
11 A' 1461 1408 23.13      
12 A' 1430 1377 1.73      
13 A' 1280 1233 374.88      
14 A' 1155 1113 4.49      
15 A' 1074 1035 124.74      
16 A' 1038 1000 4.15      
17 A' 931 897 25.87      
18 A' 826 796 12.38      
19 A' 630 607 9.31      
20 A' 421 406 0.73      
21 A' 359 346 9.89      
22 A' 186 179 5.97      
23 A" 3115 3001 44.00      
24 A" 3110 2997 6.81      
25 A" 3086 2974 6.44      
26 A" 1538 1482 5.45      
27 A" 1528 1473 9.19      
28 A" 1307 1260 0.00      
29 A" 1201 1157 5.71      
30 A" 1104 1063 6.52      
31 A" 840 810 0.34      
32 A" 578 557 9.79      
33 A" 257 247 1.94      
34 A" 147 142 7.75      
35 A" 85 82 0.54      
36 A" 54 52 0.37      

Unscaled Zero Point Vibrational Energy (zpe) 25952.4 cm-1
Scaled (by 0.9636) Zero Point Vibrational Energy (zpe) 25007.8 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 QCISD/6-31G
ABC
0.26874 0.06684 0.05522

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -2.351 0.000 0.000
C2 -0.936 -0.543 0.000
O3 0.000 0.488 0.000
O4 -0.611 -1.747 0.000
C5 1.439 0.086 0.000
C6 2.244 1.387 0.000
H7 -3.057 -0.840 0.000
H8 -2.512 0.627 0.891
H9 -2.512 0.627 -0.891
H10 1.628 -0.531 0.892
H11 1.628 -0.531 -0.892
H12 3.324 1.161 0.000
H13 2.009 1.986 -0.893
H14 2.009 1.986 0.893

Atom - Atom Distances (Å)
  C1 C2 O3 O4 C5 C6 H7 H8 H9 H10 H11 H12 H13 H14
C11.51612.40162.46583.79114.80041.09751.10101.10104.11304.11305.79284.87384.8738
C21.51611.39251.24702.45643.71992.14212.15572.15572.71502.71504.58793.98303.9830
O32.40161.39252.31721.49402.41753.33352.66912.66912.11802.11803.39132.66022.6602
O42.46581.24702.31722.74984.23992.60853.16893.16892.70022.70024.89314.64724.6472
C53.79112.45641.49402.74981.53054.59044.08624.08621.10091.10092.17032.17562.1756
C64.80043.71992.41754.23991.53055.75044.89854.89852.20312.20311.10311.10081.1008
H71.09752.14213.33352.60854.59045.75041.80091.80094.77984.77986.68775.86955.8695
H81.10102.15572.66913.16894.08624.89851.80091.78134.29954.65455.92795.04694.7210
H91.10102.15572.66913.16894.08624.89851.80091.78134.65454.29955.92794.72105.0469
H104.11302.71502.11802.70021.10092.20314.77984.29954.65451.78422.55603.10902.5450
H114.11302.71502.11802.70021.10092.20314.77984.65454.29951.78422.55602.54503.1090
H125.79284.58793.39134.89312.17031.10316.68775.92795.92792.55602.55601.79081.7908
H134.87383.98302.66024.64722.17561.10085.86955.04694.72103.10902.54501.79081.7870
H144.87383.98302.66024.64722.17561.10085.86954.72105.04692.54503.10901.79081.7870

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 111.242 C1 C2 O4 126.072
C2 C1 H7 109.036 C2 C1 H8 109.898
C2 C1 H9 109.898 C2 O3 C5 116.601
O3 C2 O4 122.686 O3 C5 C6 106.126
O3 C5 H10 108.467 O3 C5 H11 108.467
C5 C6 H12 109.931 C5 C6 H13 110.478
C5 C6 H14 110.478 C6 C5 H10 112.678
C6 C5 H11 112.678 H7 C1 H8 110.002
H7 C1 H9 110.002 H8 C1 H9 107.994
H10 C5 H11 108.262 H12 C6 H13 108.695
H12 C6 H14 108.695 H13 C6 H14 108.513
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability