Dinuclear ligand-to-ligand charge transfer complexes

The synthesis and characterization of dinuclear ligand-to-ligand charge transfer complexes are described. Each complex is comprised of square-planar platinum(ii) coordinated to a 3-tert-butyl-orthocatecholate donor and a 4,4 '-di-tert-butyl-2,2 '-bipyridine acceptor. Both complexes exhibit donor -> acceptor ligand-to-ligand charge transfer (LL'CT) bands in the visible spectrum. The platinum complexes are covalently attached at the catecholate 5-position to either a meta- or para-phenylene bridge fragment. Both cyclic voltammetry and electronic absorption spectroscopy exhibit features characteristic of intramolecular interaction between the platinum centres. The LL'CT excited state lifetimes are similar to twofold longer than the mononuclear parent complex. The properties of these complexes are discussed and compared to similar complexes in the literature.

Automated summary

The synthesis and characterization of dinuclear ligand-to-ligand charge transfer complexes with platinum(ii) coordinated to tert-butyl-orthocatecholate donor and di-tert-butyl-2,2'-bipyridine acceptor were described. The complexes exhibited ligand-to-ligand charge transfer bands in the visible spectrum and showed intramolecular interaction between the platinum centres. The excited state lifetimes of these complexes were twofold longer than the mononuclear parent complex. The properties of these complexes were discussed and compared to similar complexes in the literature.