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All results from a given calculation for H3PO4 (Phosphoric Acid)

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 C3 1A
Energy calculated at CISD/3-21G
 hartrees
Energy at 0K-639.034499
Energy at 298.15K 
HF Energy-638.554740
Nuclear repulsion energy271.219648
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 3756 3536 5.68      
2 A 1290 1214 166.53      
3 A 1047 985 131.76      
4 A 839 790 51.14      
5 A 476 448 97.33      
6 A 141 133 354.66      
7 E 3751 3531 144.58      
7 E 3751 3531 144.58      
8 E 1135 1068 101.14      
8 E 1135 1068 101.14      
9 E 936 881 285.28      
9 E 936 881 285.28      
10 E 442 416 107.55      
10 E 442 416 107.55      
11 E 350 329 1.15      
11 E 350 329 1.15      
12 E 129i 122i 85.89      
12 E 129i 122i 85.89      

Unscaled Zero Point Vibrational Energy (zpe) 10259.1 cm-1
Scaled (by 0.9413) Zero Point Vibrational Energy (zpe) 9656.9 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 CISD/3-21G
ABC
0.14372 0.13790 0.13790

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

Point Group is C3

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
P1 0.000 0.000 0.148
O2 0.000 0.000 1.685
O3 0.000 1.465 -0.591
O4 1.269 -0.732 -0.591
O5 -1.269 -0.732 -0.591
H6 0.797 2.025 -0.504
H7 1.355 -1.703 -0.504
H8 -2.152 -0.322 -0.504

Atom - Atom Distances (Å)
  P1 O2 O3 O4 O5 H6 H7 H8
P11.53701.64081.64081.64082.27192.27192.2719
O21.53702.70682.70682.70683.08663.08663.0866
O31.64082.70682.53732.53730.97823.44672.7991
O41.64082.70682.53732.53732.79910.97823.4466
O51.64082.70682.53732.53733.44672.79910.9782
H62.27193.08660.97822.79913.44673.76963.7696
H72.27193.08663.44670.97822.79913.76963.7696
H82.27193.08662.79913.44660.97823.76963.7696

picture of Phosphoric Acid state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
P1 O3 H6 118.105 P1 O4 H7 118.105
P1 O5 H8 118.105 O2 P1 O3 116.774
O2 P1 O4 116.774 O2 P1 O5 116.774
O3 P1 O4 101.280 O3 P1 O5 101.280
O4 P1 O5 101.280
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability