Palladium and platinum organochalcogenolates and their transformation intometal chalcogenides

Platinum group metal chalcogenides find extensive applications in catalysis and in the electronic industry. To develop an efficient low temperature cl ean preparation of these materials, molecular routes have been explored. Th us the chemistry of mononuclear organochalcogenolates of the type [M(ER')(2 )(PR3)(2)], binuclear benzylselenolates, [M2Cl2(mu-SeBz)(2)(PR3)(2)], allyl palladium complexes [Pd-2(mu-ER)(2)(eta(3)-C4H7)(2)] and palladium/platinum sulphido/selenido-bridged complexes, [M-2(mu-E)(2)L-4] (M = Pd or Pt; E = S, Se or Te; L = tertiary phosphine ligand) has been investigated. All the complexes have been characterized by elemental analysis, NMR (H-1, P-31, Se -77, Pt-195) spectroscopy and in some cases by X-ray diffraction. The therm al behaviour of these complexes has been studied by TGA. The pyrolysis of a llylpalladium complexes in refluxing xylene yields Pd4E as established by a nalysis and XRD patterns.