Luminescent 1D chain of platinum(ii) terpyridyl units with p-dithiobenzoquinone organometallic linker: self-aggregation imparted from Pt⋯Pt/π–π interactions

Abstract

Unlike p-dithiobenzoquinone (1), which is extremely reactive and has never been isolated, the metal-stabilised p-dithiobenzoquinone [Cp*Ir(η⁴-C₆H₄S₂)] (2c) was prepared and used as an efficient organometallic linker to construct novel supramolecular assemblies. Treatment of 2c with the electrophilic Pt(II)(terpy) building blocks produced the supramolecular assembly {[Pt(terpy){Cp*Ir-p-(η⁴-C₆H₄S₂)}Pt(terpy)][OTf]₄}_n (3), which was fully characterised and its molecular structure was determined by X-ray crystallography. The structure of 3 revealed the presence of π–π and Pt⋯Pt interactions among individual molecules describing a 1D chain. Complex 3 showed unusual UV/Vis absorption and luminescence behaviour at low temperature, imparted from self-aggregation mediated by π–π and Pt⋯Pt interactions.