Step-controlled synthesis of platinum(II) acetylide frameworks from conjugated polyaromatic modules

A simple synthetic route for the efficient preparation of mono- and dinuclear platinum(II) derivatives containing σ-bonded ethynyl aryl groups is described. A dinuclear complex pointing its two Pt–Cl dipoles in opposite directions is prepared either by complexation of a back-to-back terpyridine ligand with platinum salts or by cross-coupling [(4′-ethynylterpyridine)PtCl] with dibromodidodecylphenyl derivatives. FT-IR, UV–vis absorption and cyclic voltammetry are used as spectroscopic tools to characterize these new complexes.