Luminescent cyclometalated-pentafluorophenyl PtII, PtIV and heteropolynuclear complexes

Resumen

Platinum complexes bearing cyclometalating ligands possess impressive photophysical properties that make these compounds desirable for optoelectronic and photonic applications. This review is focused on the structural aspects and photoluminescence properties of cycloplatinated pentafluorophenyl (C6F5) compounds. The C6F5 group is a strong field ligand that confers a high stability to the complexes and improves their photoluminescence properties, contributing, on occasions, to the self-assembly by formation of secondary o-F⋯M interactions. In the review, the complexes are classified according to the oxidation state of platinum in mononuclear PtII-C6F5 and PtIV-C6F5 complexes, and their synthesis and properties are discussed. Some anionic and neutral PtII-C6F5 synthons are able to react with closed or subclosed shell ions to form a rich variety of highly emissive heteropolymetallic complexes. The properties of the latter are mainly determined by the heterometal, the cyclometalating group and the auxiliary ligands and, also, by diverse additional interactions (Pt⋯M, M⋯F, π⋯π), which are responsible for their intriguing multi stimulus-responsive activity (thermochromism, vapochromism, vapoluminescence or mechanochromism). © 2018 Elsevier B.V.