Dinuclear ligand-to-ligand charge transfer complexes?

Dalton Transactions Pub Date: 2023-01-18 DOI: 10.1039/D2DT03385B

Abstract

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 ～twofold longer than the mononuclear parent complex. The properties of these complexes are discussed and compared to similar complexes in the literature.

Graphical abstract: Dinuclear ligand-to-ligand charge transfer complexes
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