Ammonium hexachlororhodate(III)

Ammonium hexachlororhodate(III)
Names
	IUPAC name Ammonium hexachlororhodate(III)
	Other names Ammonium chlororhodate(III); Triammonium hexachlororhodate;
Identifiers
CAS Number	15336-18-2;
3D model (JSmol)	Interactive image;
ChemSpider	17339499;
ECHA InfoCard	100.035.770
EC Number	239-364-2;
PubChem CID	16211509;
CompTox Dashboard (EPA)	DTXSID80934738;
	InChI InChI=1S/6ClH.3H3N.Rh/h61H;31H3;/q;;;;;;;;;+3/p-3 Key: OJNYBYILSUWBHM-UHFFFAOYSA-K;
	SMILES [Rh+3]([Cl-])([Cl-])([Cl-])([Cl-])([Cl-])[Cl-].[NH4+];
Properties
Chemical formula	Cl6H12N3Rh
Molar mass	369.72 g·mol−1
Appearance	red crystals
Density	2.2 g/cm3
Solubility in water	slightly soluble
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H315, H318, H319
Precautionary statements	P264, P264+P265, P280, P302+P352, P305+P351+P338, P305+P354+P338, P317, P321, P332+P317, P337+P317, P362+P364
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Ammonium hexachlororhodate(III) is an inorganic compound with the chemical formula (NH₄)₃RhCl₆(H₂O). It is a red, diamagnetic solid that is slightly soluble in water. It is one of several salts of hexachlororhodate.

Structure

A monohydrate has been characterized by X-ray crystallography.^[2] It forms orthorhombic crystals (space group: Pnma, a = 1.2213, b = 0.7012, c = 1.4151 nm, α = β = γ = 90°).^[3]

Preparation and reactions

Ammonium hexachlororhodate(III) can be prepared by treating rhodium trichloride with excess ammonium chloride solution:^[4]

RhCl₃ + 3NH₄Cl → (NH₄)₃RhCl₆

The compound undergoes partial hydrolysis in dilute aqueous solutions:

(NH₄)₃[RhCl₆] + H₂O → (NH₄)₂[RhCl₅(H₂O)] + NH₄Cl

Related compounds

References

↑ PubChem. "Triammonium hexachlororhodate". pubchem.ncbi.nlm.nih.gov. Retrieved 2026-03-23.
↑ Bukanova, A.E.; Sergienko, V.S.; Sidorova, T.P.; Belan, V.N.; Shubochkin, L.K.; Porai Koshits, M.A. (1988). "Preparation and crystal structure of (NH₄)₃(RhCl₆)(H₂O), a Product of the Reaction of Rhodium Chloride with L-Aspargine". Russian Journal of Inorganic Chemistry. 33: 379-382.
↑ Villars, Pierre; Cenzual, Karin; Gladyshevskii, Roman (2017). Handbook of inorganic substances 2017. Inorganic Substances. Berlin Boston: De Gruyter. ISBN 978-3-11-044408-7.
↑ Prakash Satya (2013). "Platinum Metals-II:Rhodium". Advanced Chemistry of Rare Elements, 5th Ed. India: S Chand and Company Limited. p. 587.

[1] PubChem. "Triammonium hexachlororhodate". pubchem.ncbi.nlm.nih.gov. Retrieved 2026-03-23.

[2] Bukanova, A.E.; Sergienko, V.S.; Sidorova, T.P.; Belan, V.N.; Shubochkin, L.K.; Porai Koshits, M.A. (1988). "Preparation and crystal structure of (NH₄)₃(RhCl₆)(H₂O), a Product of the Reaction of Rhodium Chloride with L-Aspargine". Russian Journal of Inorganic Chemistry. 33: 379-382.

[3] Villars, Pierre; Cenzual, Karin; Gladyshevskii, Roman (2017). Handbook of inorganic substances 2017. Inorganic Substances. Berlin Boston: De Gruyter. ISBN 978-3-11-044408-7.

[4] Prakash Satya (2013). "Platinum Metals-II:Rhodium". Advanced Chemistry of Rare Elements, 5th Ed. India: S Chand and Company Limited. p. 587.

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