Phosphinic Acid

An inorganic compound, H3O2P, 65.996 g/mol. Boiling point Decomposes upon heating >133 °C, melting point 26.5 °C, as published.

verified recordInorganic compound6 measured properties

Identifiers

Molecular formula: H₃O₂P
Molecular weight: 65.996 g/mol
Exact mass: 65.987066 g/mol
IUPAC name: phosphinic acid
SMILES: O=[PH2]O
InChI: InChI=1S/H3O2P/c1-3-2/h3H2,(H,1,2)
InChIKey: ACVYVLVWPXVTIT-UHFFFAOYSA-N

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Measured properties

Published measurements, each with its source. Two readings of one property are both shown, in the units each used.

Boiling Point: Decomposes upon heating >133 °Cmeasured · Hazardous Substances Data Bank (HSDB); 130 °C @760 [mm Hg]measured · PAC Chemical Database, U.S. Department of Energy
Melting Point: 26.5 °Cmeasured · Hazardous Substances Data Bank (HSDB); 26.5 °Cmeasured · PAC Chemical Database, U.S. Department of Energy
Density: Marketed in aqueous solutions of varying concentrations, 50% (density 1.274), 30-32% (density 1.13), 10% (density 1.04)measured · Hazardous Substances Data Bank (HSDB); 1.439 @25 °Cmeasured · PAC Chemical Database, U.S. Department of Energy
Solubility: Miscible with watermeasured · Hazardous Substances Data Bank (HSDB); Miscible with alcoholmeasured · Hazardous Substances Data Bank (HSDB)
Vapor Pressure: 0.00323 mmg Hg at 25 °C (effusion method: vapor pressure balance)measured · Hazardous Substances Data Bank (HSDB)
Viscosity: 58.4 mN/m (60% aqueous solution)measured · ECHA; Search for Chemicals. Phosphinic Acid (6303-21-5) Registered Substances Dossier. European Chemical Agency. Available from, as of May 11, 2017: https://echa.europa.eu/

Calculated properties

Derived from the structure, not from a sample; kept apart from the measurements above.

Molecular weight: 65.996 g/molcalculated · reference compound database; Average mass of one molecule, from reference compound database.
Exact mass: 65.98706633 Dacalculated · reference compound database; Mass of the most common isotopic form.
XLogP3: -1.1calculated · reference compound database; Estimated oil/water partition, computed by reference compound database.
Polar surface area: 37.3 Å²calculated · reference compound database; Polar surface area as computed by reference compound database.
Complexity: 10calculated · reference compound database; A rough measure of how intricate the structure is.
H-bond donors: 1calculated · reference compound database
H-bond acceptors: 2calculated · reference compound database
logP: -0.35calculated · chemistry engine; Estimated preference for oil over water. Higher means more oil-like.
Topological polar surface area: 37.3 Å²calculated · chemistry engine; Surface area from polar atoms; relates to how easily a molecule crosses membranes.
H-bond donors: 1calculated · chemistry engine; Atoms that can donate a hydrogen bond.
H-bond acceptors: 1calculated · chemistry engine; Atoms that can accept a hydrogen bond.
Rotatable bonds: 0calculated · chemistry engine; Single bonds the molecule can freely twist around.
Molar refractivity: 12.6153 cm³/molcalculated · chemistry engine; Relates to the molecule's polarisability.
Fraction sp³ carbons: 0calculated · chemistry engine; Share of carbon atoms with tetrahedral bonding.
QED drug-likeness: 0.3922calculated · chemistry engine; Quantitative estimate of drug-likeness (0–1).

What it is made of

Elements

O Oxygen2 atoms · 48.5% by mass
P Phosphorus1 atom · 46.9% by mass
H Hydrogen3 atoms · 4.6% by mass

Percentages are of the molecular weight above, worked out the same way the molar mass calculator does it.

Structure

Heavy atoms, hydrogen excluded: 3
Total atoms, hydrogen included: 6
Rings: 0
Aromatic rings: 0
Stereocentres: 1
Formal charge: 0

The molecule in three dimensions

Rotate and inspect the atoms. Loaded only when you ask, so the page stays light.

The drawing above is a diagram of what is bonded to what. A molecule is not flat, and the model here is one low-energy shape generated from the connectivity — useful for seeing which groups can reach each other, and not a measured structure. A real sample is a population of conformations, interconverting.

Reactions it appears in

No documented reaction with a written procedure and a source involves Phosphinic Acid yet.

Other names for it

The systematic name on this record is phosphinic acid.

The sources also call it Acid, Phosphinic, RefChem:929168, DTXCID401012094, 8B1RL9B4ZJ, CHEBI:29031, DTXSID90873902, Hydroxyphosphine oxide, Hypophosphorous acid, Hypophosphorus acid, NSC-41904, Phosphine oxide, hydroxy-.

Structurally related

Nothing structurally close to Phosphinic Acid has a page here yet.

Where these values came from

reference compound database4124402
compound record
chemistry engine
structure perception

compound record.

What this page does not claim

Identifiers are copied from the source record, measured values are reported as published, and calculated values are marked as calculated. Nothing here is a hazard, purity or handling assessment — how the library is checked.