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 CHOCOOH (oxo acetic acid)

using model chemistry: MP2/CEP-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 MP2/CEP-31G
 hartrees
Energy at 0K-59.544647
Energy at 298.15K-59.547541
HF Energy-59.045749
Nuclear repulsion energy83.909780
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 MP2/CEP-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' 3597 3476 80.26      
2 A' 3111 3006 44.82      
3 A' 1627 1572 83.61      
4 A' 1523 1472 32.45      
5 A' 1323 1279 4.11      
6 A' 1255 1213 356.81      
7 A' 1156 1117 3.47      
8 A' 817 789 83.90      
9 A' 633 611 11.96      
10 A' 475 459 6.31      
11 A' 265 256 32.42      
12 A" 928 897 6.63      
13 A" 607 587 130.53      
14 A" 507 490 74.22      
15 A" 162 157 33.00      

Unscaled Zero Point Vibrational Energy (zpe) 8993.4 cm-1
Scaled (by 0.9663) Zero Point Vibrational Energy (zpe) 8690.3 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 MP2/CEP-31G
ABC
0.33512 0.14090 0.09920

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-31G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.806 -0.755 0.000
C2 0.000 0.589 0.000
O3 -0.200 -1.882 0.000
O4 -0.562 1.722 0.000
O5 1.398 0.431 0.000
H6 -1.911 -0.654 0.000
H7 1.659 -0.528 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 O4 O5 H6 H7
C11.56731.27952.48882.50301.10942.4757
C21.56732.47911.26451.40702.27982.0004
O31.27952.47913.62182.81152.10562.2999
O42.48881.26453.62182.34692.73233.1618
O52.50301.40702.81152.34693.48240.9943
H61.10942.27982.10562.73233.48243.5724
H72.47572.00042.29993.16180.99433.5724

picture of oxo acetic acid state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 O4 122.660 C1 C2 O5 114.504
C2 C1 O3 120.783 C2 C1 H6 115.744
C2 O5 H7 111.677 O3 C1 H6 123.473
O4 C2 O5 122.836
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability