Magnus* green salt, Pt

Tetraamminepalladium(II) tetrachloropalladate(II), the palladium analog of Magnus green salt, [Pt(NH3)4][PtCl4], may be prepared by treatment of aqueous ammonium tetra-chloropalladate(II) with aqueous ammonia, by addition of aqueous ammonia to a palladium(II) chloride solution, by treatment of aqueous tetraamminepalladium(II) chloride with palladium(II) chloride solution, and by precipitation on mixing a freshly prepared solution of a tetra-amminepalladium(II) salt with cold aqueous potassium tet-... 

Metal chain substances containing alternating cations and anions e.g., Magnus green salt, [Pt(NH3)4][PtCU], or [Pt(CNCH3)4][Pt(CN)4], are prepared by slow mixing of the component square-planar complex ions and are not discussed here. 

Figure 2. The crystal structure of Magnus Green Salt [Pt(NHsh ] [PtCin (MGS). Left chain structure. Right atomic arrangement of MGS projected on (001) ----------------- z = 0 ------ z=y2.

Fig. 41. Crystal structure of Magnus Green Salt [Pt ClJ [Pt (NHs>4] (a) top view ...

The assembly of metal and ligands that we call a complex may have a net ionic charge, in which case it is a complex ion (e.g., [PtCU] ). Together with the counterions, we have a complex salt (e.g., K2[PtCU]). In some cases both the cation and the anion may be complex, as in the picturesquely named Magnus green salt [Pt(NH3)4][PtCl4]. Square brackets are used to enclose the individual complex molecules or ions where necessary to avoid ambiguity. 

Pei J, Li X-Y (2000) Preparation, characterization, and application of electrodes modified with electropolymerized one-dimensional Magnus green salts Pt(NH3)4 PtC14 and Pt (NH3)4 PtC16. J Solid State Electrochem 4 131-140... 

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