One-dimensional phosphinite platinum chains based on hydrogen bonding interactions and phosphinite tetranuclear platinum(ii)–thallium(i) complexes

Abstract

The mononuclear pentafluorophenyl platinum complex containing the chelated diphenylphosphinous acid/diphenylphosphinite system [Pt(C₆F₅){(PPh₂O)₂H}(PPh₂OH)] 1 has been prepared and characterised. 1 and the related alkynyl complex [Pt(CCBu^t){(PPh₂O)₂H}(PPh₂OH)] 2 form infinite one-dimensional chains in the solid state based on intermolecular O–H⋯O hydrogen bonding interactions. Deprotonation reactions of [PtL{(PPh₂O)₂H}(PPh₂OH)] (L = C₆F₅1, CCBu^t2, CCPh 3) with [Tl(acac)] yields tetranuclear Pt₂Tl₂ complexes [PtL{(PPh₂O)₂H}(PPh₂O)Tl]₂ (L = C₆F₅4, CCBu^t5, CCPh 6). The structure of the tert-butylalkynyl derivative 5, established by X-ray diffraction, shows two anionic discrete units [Pt(CCBu^t){(PPh₂O)₂H}(PPh₂O)]⁻ joined by two Tl(I) centres via Tl–O and Pt–Tl bonds. Despite the existence of Pt–Tl interactions, they do not show luminescence.