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All results from a given calculation for HCOOH (Formic acid)

using model chemistry: MP2=FULL/6-311G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
1 2 no CS 1A'

Conformer 1 (CS)

Jump to S1C2
Energy calculated at MP2=FULL/6-311G**
 hartrees
Energy at 0K-189.408036
Energy at 298.15K-189.410779
HF Energy-188.817668
Nuclear repulsion energy70.168095
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=FULL/6-311G**
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' 3815 3619 65.88 61.14 0.27 0.43
2 A' 3128 2967 50.56 109.52 0.27 0.43
3 A' 1839 1744 295.35 8.64 0.26 0.42
4 A' 1439 1365 2.58 10.41 0.54 0.70
5 A' 1335 1267 10.96 0.57 0.58 0.74
6 A' 1156 1096 257.30 2.37 0.15 0.26
7 A' 638 605 47.25 4.35 0.57 0.72
8 A" 1076 1020 2.15 1.33 0.75 0.86
9 A" 702 665 148.61 1.58 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 7563.6 cm-1
Scaled (by 0.9486) Zero Point Vibrational Energy (zpe) 7174.9 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=FULL/6-311G**
ABC
2.60483 0.40100 0.34750

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-311G**

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.421 0.000
O2 -1.034 -0.441 0.000
O3 1.162 0.110 0.000
H4 -0.386 1.447 0.000
H5 -0.638 -1.323 0.000

Atom - Atom Distances (Å)
  C1 O2 O3 H4 H5
C11.34561.20241.09671.8570
O21.34562.26331.99620.9673
O31.20242.26332.04502.3005
H41.09671.99622.04502.7821
H51.85700.96732.30052.7821

picture of Formic acid state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 O2 H5 105.643 O2 C1 O3 125.223
O2 C1 H4 109.219 O3 C1 H4 125.558
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

Conformer 2 (CS)

Jump to S1C1
Energy calculated at MP2=FULL/6-311G**
 hartrees
Energy at 0K-189.399490
Energy at 298.15K 
HF Energy-188.808468
Nuclear repulsion energy69.930435
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=FULL/6-311G**
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' 3887 3687 70.33 76.02 0.28 0.44
2 A' 3024 2868 94.66 105.83 0.27 0.42
3 A' 1875 1779 241.28 9.21 0.21 0.34
4 A' 1455 1380 0.14 9.11 0.59 0.74
5 A' 1304 1237 319.38 3.97 0.65 0.79
6 A' 1136 1078 44.31 6.29 0.40 0.57
7 A' 664 630 12.63 1.34 0.63 0.77
8 A" 1054 1000 0.37 1.73 0.75 0.86
9 A" 519 492 93.38 1.53 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 7459.0 cm-1
Scaled (by 0.9486) Zero Point Vibrational Energy (zpe) 7075.6 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=FULL/6-311G**
ABC
2.91187 0.38833 0.34263

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-311G**

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.382 0.000
O2 -0.901 -0.626 0.000
O3 1.182 0.196 0.000
H4 -0.468 1.382 0.000
H5 -1.779 -0.235 0.000

Atom - Atom Distances (Å)
  C1 O2 O3 H4 H5
C11.35191.19601.10451.8831
O21.35192.23882.05470.9616
O31.19602.23882.03172.9919
H41.10452.05472.03172.0821
H51.88310.96162.99192.0821

picture of Formic acid state 1 conformation 2
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 O2 H5 107.776 O2 C1 O3 122.848
O2 C1 H4 113.154 O3 C1 H4 123.998
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability