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All results from a given calculation for C4H8O2 (Ethyl acetate)

using model chemistry: CBS-Q

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at CBS-Q
 hartrees
Energy at 0K-307.204767
Energy at 298.15K-307.196441
HF Energy-305.874207
Nuclear repulsion energy245.619343
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 CBS-Q
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A' 3328 3328 13.54 67.82 0.68 0.81
2 A' 3273 3273 44.73 65.81 0.68 0.81
3 A' 3241 3241 14.40 100.31 0.16 0.27
4 A' 3214 3214 4.46 108.13 0.01 0.03
5 A' 3199 3199 22.66 96.42 0.02 0.04
6 A' 2011 2011 356.10 3.72 0.68 0.81
7 A' 1663 1663 3.53 2.08 0.75 0.86
8 A' 1634 1634 2.08 20.32 0.74 0.85
9 A' 1605 1605 14.94 13.55 0.75 0.86
10 A' 1579 1579 5.39 3.38 0.46 0.63
11 A' 1550 1550 110.24 2.76 0.75 0.85
12 A' 1526 1526 8.20 1.26 0.50 0.66
13 A' 1420 1420 516.81 0.77 0.75 0.86
14 A' 1244 1244 43.16 7.36 0.16 0.27
15 A' 1185 1185 83.01 3.50 0.65 0.78
16 A' 1101 1101 3.67 2.90 0.28 0.44
17 A' 1026 1026 4.59 2.07 0.42 0.59
18 A' 949 949 12.17 8.90 0.36 0.53
19 A' 691 691 12.57 7.82 0.32 0.48
20 A' 457 457 1.19 0.28 0.68 0.81
21 A' 397 397 11.43 2.23 0.30 0.46
22 A' 206 206 5.87 0.23 0.67 0.80
23 A" 3299 3299 63.61 5.60 0.75 0.86
24 A" 3283 3283 10.46 61.66 0.75 0.86
25 A" 3270 3270 3.43 105.57 0.75 0.86
26 A" 1621 1621 4.04 17.29 0.75 0.86
27 A" 1612 1612 5.69 15.79 0.75 0.86
28 A" 1423 1423 1.59 10.69 0.75 0.86
29 A" 1292 1292 6.03 0.95 0.75 0.86
30 A" 1175 1175 10.96 0.82 0.75 0.86
31 A" 873 873 0.01 0.20 0.75 0.86
32 A" 668 668 13.97 1.63 0.75 0.86
33 A" 283 283 1.19 0.02 0.75 0.86
34 A" 159 159 5.54 0.00 0.75 0.86
35 A" 100 100 0.09 0.10 0.75 0.86
36 A" 79 79 0.70 0.13 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 27816.5 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 27816.5 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 CBS-Q
ABC
0.27840 0.07009 0.05782

See section I.F.4 to change rotational constant units
Geometric Data calculated at CBS-Q

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -2.295 -0.013 0.000
C2 -0.884 -0.542 0.000
O3 0.000 0.445 0.000
O4 -0.586 -1.688 0.000
C5 1.379 0.092 0.000
C6 2.178 1.379 0.000
H7 -2.993 -0.840 0.000
H8 -2.453 0.609 0.877
H9 -2.453 0.609 -0.877
H10 1.589 -0.512 0.877
H11 1.589 -0.512 -0.877
H12 3.243 1.154 0.000
H13 1.952 1.974 -0.881
H14 1.952 1.974 0.881

Atom - Atom Distances (Å)
  C1 C2 O3 O4 C5 C6 H7 H8 H9 H10 H11 H12 H13 H14
C11.50652.34012.39283.67524.68501.08251.08661.08664.01254.01255.65924.77134.7713
C21.50651.32501.18442.35023.61562.12982.13432.13432.62402.62404.46193.89293.8929
O32.34011.32502.21221.42322.37053.25732.61052.61052.05102.05103.31932.63202.6320
O42.39281.18442.21222.65174.12992.55173.08733.08732.62392.62394.76884.54274.5427
C53.67522.35021.42322.65171.51574.47023.96503.96501.08471.08472.14532.15602.1560
C64.68503.61562.37054.12991.51575.62784.77654.77652.16612.16611.08781.08681.0868
H71.08252.12983.25732.55174.47025.62781.77771.77774.67664.67666.54695.75815.7581
H81.08662.13432.61053.08733.96504.77651.77771.75364.19454.54625.78874.93614.6124
H91.08662.13432.61053.08733.96504.77651.77771.75364.54624.19455.78874.61244.9361
H104.01252.62402.05102.62391.08472.16614.67664.19454.54621.75302.50553.06602.5120
H114.01252.62402.05102.62391.08472.16614.67664.54624.19451.75302.50552.51203.0660
H125.65924.46193.31934.76882.14531.08786.54695.78875.78872.50552.50551.76451.7645
H134.77133.89292.63204.54272.15601.08685.75814.93614.61243.06602.51201.76451.7625
H144.77133.89292.63204.54272.15601.08685.75814.61244.93612.51203.06601.76451.7625

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 111.313 C1 C2 O4 125.124
C2 C1 H7 109.608 C2 C1 H8 109.722
C2 C1 H9 109.722 C2 O3 C5 117.519
O3 C2 O4 123.563 O3 C5 C6 107.486
O3 C5 H10 108.993 O3 C5 H11 108.993
C5 C6 H12 109.880 C5 C6 H13 110.797
C5 C6 H14 110.797 C6 C5 H10 111.745
C6 C5 H11 111.745 H7 C1 H8 110.084
H7 C1 H9 110.084 H8 C1 H9 107.593
H10 C5 H11 107.823 H12 C6 H13 108.465
H12 C6 H14 108.465 H13 C6 H14 108.365
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability