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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-639.292030
Energy at 298.15K-639.298117
HF Energy-638.787040
Nuclear repulsion energy280.642648
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 3753 3507 1.05      
2 A 1433 1339 285.49      
3 A 1030 963 193.74      
4 A 922 861 34.24      
5 A 510 477 56.26      
6 A 287 269 205.41      
7 E 3749 3503 140.34      
7 E 3749 3503 140.34      
8 E 1131 1057 129.18      
8 E 1131 1057 129.18      
9 E 956 894 355.17      
9 E 956 894 355.17      
10 E 491 459 130.69      
10 E 491 459 130.69      
11 E 401 374 20.30      
11 E 401 374 20.30      
12 E 149 139 108.75      
12 E 149 139 108.75      

Unscaled Zero Point Vibrational Energy (zpe) 10844.8 cm-1
Scaled (by 0.9344) Zero Point Vibrational Energy (zpe) 10133.4 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 CISD/3-21G*
ABC
0.15053 0.14968 0.14968

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 0.120
O2 0.000 0.000 1.585
O3 0.000 1.425 -0.575
O4 1.234 -0.713 -0.575
O5 -1.234 -0.713 -0.575
H6 0.610 2.104 -0.223
H7 1.517 -1.580 -0.223
H8 -2.127 -0.524 -0.223

Atom - Atom Distances (Å)
  P1 O2 O3 O4 O5 H6 H7 H8
P11.46471.58581.58581.58582.21692.21692.2169
O21.46472.58782.58782.58782.83962.83962.8396
O31.58582.58782.46872.46870.97803.38482.9063
O41.58582.58782.46872.46872.90630.97803.3848
O51.58582.58782.46872.46873.38482.90630.9780
H62.21692.83960.97802.90633.38483.79373.7937
H72.21692.83963.38480.97802.90633.79373.7937
H82.21692.83962.90633.38480.97803.79373.7937

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 117.734 P1 O4 H7 117.734
P1 O5 H8 117.734 O2 P1 O3 116.001
O2 P1 O4 116.001 O2 P1 O5 116.001
O3 P1 O4 102.224 O3 P1 O5 102.224
O4 P1 O5 102.224
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability