# Diammonium hydrogen phosphite (CAS 51503-61-8)

CAS: 51503-61-8
PubChem CID: 20070165
InChIKey: BKDZEHRQSMRTPR-UHFFFAOYSA-P
Molecular formula: H₁₁N₂O₄P
Molar mass: 116.06 g/mol
IUPAC: diazanium;hydrogen phosphite
SMILES: [NH4+].[NH4+].OP([O-])[O-]
InChI: InChI=1S/2H3N.HO3P/c;;1-4(2)3/h2*1H3;1H/q;;-2/p+2
PSA: 68.4 A^2
Hydrogen bond donors: 3
Hydrogen bond acceptors: 3
Rotatable bonds: 0
Heavy atoms: 6
3D structure: 15 atoms, 12 bonds

## About the compound

Diammonium hydrogen phosphite (CAS 51503-61-8) is a chemical compound registered under CAS number 51503-61-8. Molecular formula: H₁₁N₂O₄P. Molar mass: 116.06 g/mol. The full systematic IUPAC name is: diazanium;hydrogen phosphite. The molecule contains 15 atoms connected by 12 chemical bonds. 
Chemical data comes from the PubChem (NIH), ChEMBL (EBI) and NIST WebBook databases. GHS statement translations comply with the CLP Regulation (EC 1272/2008). Interactive 3D model and 2D skeleton available at: https://molgod.org/molekula/51503-61-8/


## Synonyms

  - Ammonium hydrogenphosphite
  - 51503-61-8
  - diazanium;hydrogen phosphite
  - diammonium;hydrogen phosphite
  - H9N2O3P
  - MFCD00049393
  - AKOS015856779
  - F20662

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## Data sources

  - PubChem CID 20070165: https://pubchem.ncbi.nlm.nih.gov/compound/20070165
  - NIST WebBook: https://webbook.nist.gov/cgi/cbook.cgi?ID=51503-61-8
  - ChEMBL: https://www.ebi.ac.uk/chembl/g/#search_results/all/query=51503-61-8

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Last updated: 2026-09-02
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