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All results from a given calculation for HCOOC2H5 (Ethyl formate)

using model chemistry: CISD/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS trans 1A'
Energy calculated at CISD/3-21G
 hartrees
Energy at 0K-265.806504
Energy at 298.15K-265.813705
HF Energy-265.336965
Nuclear repulsion energy175.596213
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 CISD/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' 3206 3018 19.55      
2 A' 3176 2990 57.47      
3 A' 3156 2971 12.21      
4 A' 3139 2954 11.97      
5 A' 1802 1697 211.42      
6 A' 1636 1540 8.72      
7 A' 1619 1524 4.86      
8 A' 1523 1433 9.50      
9 A' 1476 1389 10.78      
10 A' 1475 1389 5.92      
11 A' 1235 1162 431.07      
12 A' 1188 1119 13.15      
13 A' 1047 985 6.49      
14 A' 876 825 11.08      
15 A' 811 763 5.42      
16 A' 378 356 8.68      
17 A' 223 210 7.97      
18 A" 3221 3032 32.70      
19 A" 3192 3005 6.54      
20 A" 1606 1512 5.46      
21 A" 1367 1287 0.01      
22 A" 1247 1174 6.94      
23 A" 1099 1035 0.46      
24 A" 873 822 0.78      
25 A" 331 312 31.38      
26 A" 239 225 4.08      
27 A" 52 49 0.22      

Unscaled Zero Point Vibrational Energy (zpe) 20596.9 cm-1
Scaled (by 0.9413) Zero Point Vibrational Energy (zpe) 19387.8 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 CISD/3-21G
ABC
0.58290 0.09442 0.08380

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -2.201 -0.246 0.000
C2 -0.714 -0.596 0.000
O3 0.000 0.700 0.000
C4 1.363 0.634 0.000
O5 2.009 -0.399 0.000
H6 -2.803 -1.156 0.000
H7 -2.442 0.342 0.885
H8 -2.442 0.342 -0.885
H9 -0.423 -1.164 -0.884
H10 -0.423 -1.164 0.884
H11 1.773 1.642 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 C4 O5 H6 H7 H8 H9 H10 H11
C11.52782.39553.67144.21261.09131.08971.08972.18712.18714.3994
C21.52781.47972.41432.73002.16252.15642.15641.08951.08953.3457
O32.39551.47971.36502.28953.36152.62202.62202.10542.10542.0076
C43.67142.41431.36501.21774.53443.91793.91792.68422.68421.0879
O54.21262.73002.28951.21774.87084.59804.59802.69842.69842.0541
H61.09132.16253.36154.53444.87081.77721.77722.53812.53815.3633
H71.08972.15642.62203.91794.59801.77721.77073.07752.51834.4987
H81.08972.15642.62203.91794.59801.77721.77072.51833.07754.4987
H92.18711.08952.10542.68422.69842.53813.07752.51831.76713.6709
H102.18711.08952.10542.68422.69842.53812.51833.07751.76713.6709
H114.39943.34572.00761.08792.05415.36334.49874.49873.67093.6709

picture of Ethyl formate state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 O3 105.586 C1 C2 H9 112.278
C1 C2 H10 112.278 C2 C1 H6 110.200
C2 C1 H7 109.816 C2 C1 H8 109.816
C2 O3 C4 116.087 O3 C2 H9 109.116
O3 C2 H10 109.116 O3 C4 O5 124.771
O3 C4 H11 109.347 O5 C4 H11 125.882
H6 C1 H7 109.151 H6 C1 H8 109.151
H7 C1 H8 108.678 H9 C2 H10 108.374
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability