# Hexamethylenediamine tetra(methylenephosphonic acid), potassium salt

**CAS:** 38820-59-6  
**PubChem CID:** [197181](https://pubchem.ncbi.nlm.nih.gov/compound/197181)  
**Molecular formula:** C10H24KN2O12P4-3  
**Molar mass:** 527.30 g/mol  
**IUPAC:** potassium [6-[bis[[hydroxy(oxido)phosphoryl]methyl]amino]hexyl-[[hydroxy(oxido)phosphoryl]methyl]amino]methyl-hydroxyphosphinate  
**SMILES:** `C(CCCN(CP(=O)(O)[O-])CP(=O)(O)[O-])CCN(CP(=O)(O)[O-])CP(=O)(O)[O-].[K+]`  
**InChIKey:** `FZMFRKUYWHTRFD-UHFFFAOYSA-J`  
**InChI:** `InChI=1S/C10H28N2O12P4.K/c13-25(14,15)7-11(8-26(16,17)18)5-3-1-2-4-6-12(9-27(19,20)21)10-28(22,23)24;/h1-10H2,(H2,13,14,15)(H2,16,17,18)(H2,19,20,21)(H2,22,23,24);/q;+1/p-4`  

## Physicochemical properties

| Parameter | Value |
|---|---|
| PSA | 248 Ų |
| Hydrogen bond donors | 4 |
| Hydrogen bond acceptors | 14 |
| Rotatable bonds | 15 |
| Heavy atoms | 29 |

## 3D structure

The molecule contains 53 atoms connected by 51 chemical bonds. Interactive 3D model available at: https://molgod.org/molecule/38820-59-6/

## Synonyms

- Hexamethylenediamine tetra(methylenephosphonic acid), potassium salt
- RefChem:1086559
- 38820-59-6
- Phosphonic acid, (1,6-hexanediylbis(nitrilobis(methylene)))tetrakis-, potassium salt
- HDTMP hexapotassium salt
- Dequest 2054
- Phosphonic acid, [1,6-hexanediylbis[nitrilobis(methylene)]]tetrakis-,potassium salt
- EINECS 254-135-7
- Dequest 2054 deflocculant and sequestrant
- (1,6-Hexanediylbis(nitrilobis(methylene)))tetrakisphosphonic acid potassium salt

## Data sources

- [PubChem CID 197181](https://pubchem.ncbi.nlm.nih.gov/compound/197181)
- [Wikidata](https://www.wikidata.org/wiki/Q126600983)
- [NIST WebBook](https://webbook.nist.gov/cgi/cbook.cgi?ID=38820-59-6)
- [ChEMBL](https://www.ebi.ac.uk/chembl/g/#search_results/all/query=38820-59-6)

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*Last updated: 2026-10-17 · Generator: MOL-GOD v3.12.33*