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: MP4=FULL/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 MP4=FULL/3-21G
 hartrees
Energy at 0K-304.847529
Energy at 298.15K 
HF Energy-304.163317
Nuclear repulsion energy238.527035
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 MP4=FULL/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' 3154 3087        
2 A' 3115 3049        
3 A' 3057 2992        
4 A' 3052 2987        
5 A' 3045 2980        
6 A' 1675 1639        
7 A' 1591 1557        
8 A' 1578 1544        
9 A' 1547 1514        
10 A' 1476 1445        
11 A' 1450 1419        
12 A' 1419 1389        
13 A' 1225 1199        
14 A' 1146 1122        
15 A' 1050 1028        
16 A' 1007 986        
17 A' 900 881        
18 A' 809 792        
19 A' 610 597        
20 A' 400 392        
21 A' 349 342        
22 A' 182 178        
23 A" 3129 3063        
24 A" 3123 3057        
25 A" 3090 3024        
26 A" 1567 1534        
27 A" 1558 1525        
28 A" 1316 1288        
29 A" 1200 1175        
30 A" 1103 1080        
31 A" 846 828        
32 A" 578 566        
33 A" 261 256        
34 A" 151 148        
35 A" 72 71        
36 A" 28 27        

Unscaled Zero Point Vibrational Energy (zpe) 25930.2 cm-1
Scaled (by 0.9788) Zero Point Vibrational Energy (zpe) 25380.5 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 MP4=FULL/3-21G
ABC
0.26356 0.06777 0.05562

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP4=FULL/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -2.348 0.065 0.000
C2 -0.942 -0.534 0.000
O3 0.000 0.506 0.000
O4 -0.622 -1.735 0.000
C5 1.425 0.041 0.000
C6 2.265 1.329 0.000
H7 -3.082 -0.747 0.000
H8 -2.477 0.695 0.890
H9 -2.477 0.695 -0.890
H10 1.607 -0.576 0.890
H11 1.607 -0.576 -0.890
H12 3.336 1.086 0.000
H13 2.030 1.924 -0.892
H14 2.030 1.924 0.892

Atom - Atom Distances (Å)
  C1 C2 O3 O4 C5 C6 H7 H8 H9 H10 H11 H12 H13 H14
C11.52842.38922.49443.77374.78281.09461.09761.09764.10444.10445.77524.83934.8393
C21.52841.40281.24372.43613.70832.15082.15782.15782.70012.70014.57433.95803.9580
O32.38921.40282.32611.49942.40963.32712.63822.63822.13202.13203.38622.63182.6318
O42.49441.24372.32612.71074.21012.65133.18403.18402.66532.66534.86074.60644.6064
C53.77372.43611.49942.71071.53744.57594.05524.05521.09801.09802.17772.16922.1692
C64.78283.70832.40964.21011.53745.73564.86534.86532.20342.20341.09891.09711.0971
H71.09462.15083.32712.65134.57595.73561.79931.79934.77584.77586.67485.83635.8363
H81.09762.15782.63823.18404.05524.86531.79931.77924.27684.63225.89334.99914.6710
H91.09762.15782.63823.18404.05524.86531.79931.77924.63224.27685.89334.67104.9991
H104.10442.70012.13202.66531.09802.20344.77584.27684.63221.77962.55813.09892.5356
H114.10442.70012.13202.66531.09802.20344.77584.63224.27681.77962.55812.53563.0989
H125.77524.57433.38624.86072.17771.09896.67485.89335.89332.55812.55811.78991.7899
H134.83933.95802.63184.60642.16921.09715.83634.99914.67103.09892.53561.78991.7832
H144.83933.95802.63184.60642.16921.09715.83634.67104.99912.53563.09891.78991.7832

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 109.119 C1 C2 O4 127.965
C2 C1 H7 109.044 C2 C1 H8 109.414
C2 C1 H9 109.414 C2 O3 C5 114.113
O3 C2 O4 122.917 O3 C5 C6 105.013
O3 C5 H10 109.358 O3 C5 H11 109.358
C5 C6 H12 110.274 C5 C6 H13 109.723
C5 C6 H14 109.723 C6 C5 H10 112.383
C6 C5 H11 112.383 H7 C1 H8 110.329
H7 C1 H9 110.329 H8 C1 H9 108.292
H10 C5 H11 108.264 H12 C6 H13 109.185
H12 C6 H14 109.185 H13 C6 H14 108.723
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability