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 HCOOC2H5 (Ethyl formate)

using model chemistry: QCISD/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 QCISD/3-21G*
 hartrees
Energy at 0K-265.886090
Energy at 298.15K-265.893165
HF Energy-265.333271
Nuclear repulsion energy174.167464
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/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' 3111 2990 20.00      
2 A' 3069 2950 60.60      
3 A' 3058 2939 11.52      
4 A' 3044 2926 11.94      
5 A' 1704 1638 161.24      
6 A' 1592 1530 9.42      
7 A' 1578 1517 4.73      
8 A' 1478 1421 7.32      
9 A' 1426 1370 10.48      
10 A' 1423 1368 10.29      
11 A' 1169 1123 295.77      
12 A' 1145 1101 79.72      
13 A' 1010 971 5.08      
14 A' 836 803 9.17      
15 A' 778 748 4.24      
16 A' 366 351 8.04      
17 A' 218 210 6.90      
18 A" 3125 3003 32.06      
19 A" 3093 2973 8.65      
20 A" 1566 1505 4.83      
21 A" 1324 1272 0.00      
22 A" 1208 1161 5.80      
23 A" 1040 999 0.02      
24 A" 849 816 0.75      
25 A" 323 311 27.23      
26 A" 234 225 3.46      
27 A" 46 44 0.16      

Unscaled Zero Point Vibrational Energy (zpe) 19906.7 cm-1
Scaled (by 0.9611) Zero Point Vibrational Energy (zpe) 19132.4 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/3-21G*
ABC
0.56486 0.09358 0.08280

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -2.214 -0.232 0.000
C2 -0.719 -0.591 0.000
O3 0.000 0.720 0.000
C4 1.380 0.625 0.000
O5 2.012 -0.432 0.000
H6 -2.823 -1.146 0.000
H7 -2.453 0.361 0.892
H8 -2.453 0.361 -0.892
H9 -0.428 -1.162 -0.890
H10 -0.428 -1.162 0.890
H11 1.806 1.635 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 C4 O5 H6 H7 H8 H9 H10 H11
C11.53682.40963.69434.23031.09871.09711.09712.20202.20204.4316
C21.53681.49512.42582.73582.17552.16922.16921.09741.09743.3658
O32.40961.49511.38342.31863.38392.63422.63422.12572.12572.0243
C43.69432.42581.38341.23154.56063.94383.94382.69312.69311.0962
O54.23032.73582.31861.23154.88714.62134.62132.69732.69732.0774
H61.09872.17553.38394.56064.88711.79001.79002.55542.55545.3997
H71.09712.16922.63423.94384.62131.79001.78333.09792.53434.5334
H81.09712.16922.63423.94384.62131.79001.78332.53433.09794.5334
H92.20201.09742.12572.69312.69732.55543.09792.53431.78023.6883
H102.20201.09742.12572.69312.69732.55542.53433.09791.78023.6883
H114.43163.36582.02431.09622.07745.39974.53344.53343.68833.6883

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 105.251 C1 C2 H9 112.352
C1 C2 H10 112.352 C2 C1 H6 110.163
C2 C1 H7 109.757 C2 C1 H8 109.757
C2 O3 C4 114.802 O3 C2 H9 109.193
O3 C2 H10 109.193 O3 C4 O5 124.825
O3 C4 H11 108.900 O5 C4 H11 126.274
H6 C1 H7 109.207 H6 C1 H8 109.207
H7 C1 H8 108.723 H9 C2 H10 108.402
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability