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

using model chemistry: PM3

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description

Conformer 1 (CS)

Jump to S1C2
Energy calculated at PM3
 hartrees
Energy at 0K 
Energy at 298.15K-0.150406
HF Energy-0.150407
Nuclear repulsion energy60.238191
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 PM3
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' 3838 3739 27.66 77.45 0.31 0.47
2 A' 2974 2897 5.43 88.84 0.37 0.54
3 A' 1944 1893 396.23 19.98 0.19 0.32
4 A' 1362 1326 158.08 2.53 0.20 0.33
5 A' 1272 1239 42.89 20.82 0.75 0.86
6 A' 985 959 12.02 5.86 0.75 0.85
7 A' 487 474 47.88 5.30 0.62 0.77
8 A" 946 922 1.84 2.49 0.75 0.86
9 A" 570 556 155.36 4.64 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 7189.2 cm-1
Scaled (by 0.974) Zero Point Vibrational Energy (zpe) 7002.3 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 PM3
ABC
2.23492 0.43086 0.36122

See section I.F.4 to change rotational constant units
Geometric Data calculated at PM3

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.476 0.000
O2 -1.001 -0.421 0.000
O3 1.131 0.041 0.000
H4 -0.363 1.509 0.000
H5 -0.672 -1.316 0.000

Atom - Atom Distances (Å)
  C1 O2 O3 H4 H5
C11.34431.21141.09501.9137
O21.34432.18142.03260.9534
O31.21142.18142.09452.2564
H41.09502.03262.09452.8415
H51.91370.95342.25642.8415

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 111.661 O2 C1 O3 117.106
O2 C1 H4 112.474 O3 C1 H4 130.420
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability

Conformer 2 (CS)

Jump to S1C1
Energy calculated at PM3
 hartrees
Energy at 0K 
Energy at 298.15K-0.143577
HF Energy-0.143577
Nuclear repulsion energy60.196340
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 PM3
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' 3901 3800 18.86 89.80 0.33 0.50
2 A' 2912 2836 0.51 95.42 0.37 0.55
3 A' 1962 1911 292.05 26.41 0.24 0.39
4 A' 1347 1312 243.12 7.46 0.49 0.66
5 A' 1248 1215 44.07 17.21 0.68 0.81
6 A' 1069 1042 1.04 18.86 0.71 0.83
7 A' 548 534 11.43 1.45 0.75 0.86
8 A" 937 912 0.00 4.54 0.75 0.86
9 A" 405 394 75.67 5.36 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 7164.6 cm-1
Scaled (by 0.974) Zero Point Vibrational Energy (zpe) 6978.3 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 PM3
ABC
2.32157 0.43246 0.36455

See section I.F.4 to change rotational constant units
Geometric Data calculated at PM3

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.463 0.000
O2 -0.875 -0.567 0.000
O3 1.138 0.062 0.000
H4 -0.336 1.510 0.000
H5 -1.767 -0.246 0.000

Atom - Atom Distances (Å)
  C1 O2 O3 H4 H5
C11.35121.20691.09991.9040
O21.35122.10952.14550.9480
O31.20692.10952.06682.9219
H41.09992.14552.06682.2649
H51.90400.94802.92192.2649

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 110.579 O2 C1 O3 110.977
O2 C1 H4 121.823 O3 C1 H4 127.200
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability