Hydrogen-bond mediation of supramolecular aggregation in neutral bis-(C6F5)Pt complexes with aromatic H-bond donating ligands. A synthetic and structural study

Abstract

Six pentafluorophenylplatinum(II) complexes containing proton acceptor atoms (F) and pyridine-like aromatic ligands able to act as proton donors have been synthesized and characterized, with emphasis on the factors that mediate their supramolecular aggregation in the solid state—hydrogen bonds and π–π interactions. The crystal structure analyses of the mononuclear complexes cis-[Pt(C₆F₅)₂(napy)] (1), cis-[Pt(C₆F₅)₂(CH₂napy)] (3), cis-[Pt(C₆F₅)₂(2-ammpy)] (5), and cis-[Pt(C₆F₅)₂(2-bipym)] (6) reveal the influence of D–H⋯Pt and D–H⋯F (D = C, N) hydrogen bonding on the organization of molecules into stacks, which can be further interconnected to generate channels. The prevalence of hydrogen bonding over π–π interactions between aromatic rings in establishing the nature of the observed supramolecular aggregation is demonstrated.