Dichalcogenophosphinic Acids R2PE2H and their Derivatives

There are many documented synthetic routes to metal dichalcogeno-phosph(in)ates although the most common involve reaction of the alkali metal or ammonium salt of the Kgand (see Section 5.2.5 for preparation of these species) with a suitable metal precursor (including metal chlorides, oxides. 

One of the more recent innovations for the use of dichalcogenophosphates in coordination chemistry is in the synthesis of multi-metallic cluster compounds, in particular those involving d ° copper(I) or silver(I) metal centres. These clusters can be conveniently prepared from the reaction of the ammonium salt of the dichalcogenophosphate with the appropriate metal PFg salt. The most 

The coordination chemistry of the trichalcogenophosphonates is very undeveloped when compared to the analogous metal organophosphonates (RP03 ), which have been extensively studied owing to their potential and practical applications as ion exchangers, sorbents, sensors, proton conductors, nonlinear optical materials, photochemically active materials, catalysts and hosts for the intercalation of a broad spectrum of guests. 

Only a small number of metal trithiophosphonate complexes have been structurally characterised, most of which are monometallic and contain the ligand in a bidentate chelating coordination mode In these complexes 

Hitherto, only two structurally characterised triselenophosphonate complexes have been published, PtSe2P(Se)PPh(dppe) and (c-C6Hn)PSe3Li2.2tmeda, in which the triselenophosphonate ligand coordinates to the metal centre(s) using two (T) or three (V) selenium atoms respectively. 

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