New luminescent and redox-active homometallic dinuclear iridium(III), ruthenium(II) and osmium(II) complexes prepared by metal-catalyzed coupling reactions

Four new homometallic dinuclear IrIII, RuII and OsII complexes are prepared and their luminescence properties and redox behavior are reported; the bis-phenathroline bridging ligand is found to isolate the two components of each dinuclear system because of its unusual nonplanar structure.