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

**CAS:** 51503-61-8  
**PubChem CID:** [20070165](https://pubchem.ncbi.nlm.nih.gov/compound/20070165)  
**Molecular formula:** H₁₁N₂O₄P  
**Molar mass:** 116.06 g/mol  
**IUPAC:** diazanium;hydrogen phosphite  
**SMILES:** `[NH4+].[NH4+].OP([O-])[O-]`  
**InChIKey:** `BKDZEHRQSMRTPR-UHFFFAOYSA-P`  
**InChI:** `InChI=1S/2H3N.HO3P/c;;1-4(2)3/h2*1H3;1H/q;;-2/p+2`  

## Physicochemical properties

| Parameter | Value |
|---|---|
| PSA | 68.4 Ų |
| Hydrogen bond donors | 3 |
| Hydrogen bond acceptors | 3 |
| Rotatable bonds | 0 |
| Heavy atoms | 6 |

## 3D structure

The molecule contains 15 atoms connected by 12 chemical bonds. Interactive 3D model 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

## Available in the shop

[Diammonium hydrogen phosphite (CAS 51503-61-8) — Beijing Tong Guang](https://molgod.org/sds-cards/diammonium-hydrogen-phosphite-cas-51503-61-8-beijing-tong-guang/)

## 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 · Generator: MOL-GOD v3.12.33*