Magnus's green salt

Magnus's green salt

Names
IUPAC name Tetraammineplatinum(II) tetrachloroplatinate(II)
Identifiers
CAS Number	13820-46-7
3D model ( JSmol )	Interactive image
ChemSpider	141440
ECHA InfoCard	100.034.078
EC Number	237-501-0
PubChem CID	16213091
InChI InChI=1S/4ClH.4H2N.2Pt/h4*1H;4*1H2;;/q;;;;4*-1;2*+2/p-4 Key: VDZZIFNGBFCNGW-UHFFFAOYSA-J
SMILES [NH3+][Pt-2]([NH3+])([NH3+])[NH3+].Cl[Pt-2](Cl)(Cl)Cl
Properties
Chemical formula	[Pt(NH3)4][PtCl4]
Molar mass	600.09 g/mol
Appearance	green solid
Density	3.7 g/cm3
Melting point	320 °C (608 °F; 593 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

Magnus's green salt is the inorganic compound with the formula [Pt(NH₃)₄][PtCl₄]. This salt is named after Heinrich Gustav Magnus, who, in the early 1830s, first reported the compound. The compound is a linear chain compound, consisting of a chain of platinum atoms. It is dark green, which is unusual for platinum compounds.

Structure

This species has attracted interest in materials chemistry and solid-state physics because of its one-dimensional structure. It contains a chain of alternating [PtCl₄]²⁻ anions and [Pt(NH₃)₄]²⁺ cations, in which the platinum atoms are separated by 3.25 Å.^[1] It is a semiconductor.

Preparation

The compound may be prepared by combining aqueous solutions of [Pt(NH₃)₄]²⁺ and [PtCl₄]²⁻, which gives a deep green solid precipitate.

Soluble analogues of Magnus's green salt can be prepared by replacing the ammonia with ethylhexylamine.[5]^[6]

The corresponding palladium compound ([Pd(NH₃)₄][PdCl₄]) is known as "Vauquelin’s salt".

History

Magnus's green salt was one of the first examples of a metal ammine complex.

References