Synthesis, photophysical and electrochemical study of diisocyano-bridged homodinuclear rhenium(I) diimine complexes

A new series of diisocyanide-bridged homodinuclear Re(I) complexes [(phen)(Lx)(CO)2Re(CNRNC)Re(CO)2(Lx)(phen)]2+ and their mononuclear analogues [Re(PPh3)(CNRNC)(CO)2(phen)]+ [Lx = CO and PPh3; CNRNC = 1,4-phenylenediisocyanide (CNC6H4NC) and 4,4′-biphenyldiisocyanide (CNC6H4C6H4NC)] have been synthesized. The X-ray crystal structures of two of the dinuclear complexes were determined. The photophysics and electrochemistry of these complexes have been investigated. The dicarbonyl phosphino Re(I) phenanthroline complexes display intense MLCT [dπ(Re)→π∗(phen)] phosphorescence in CH2Cl2 solution with luminescence quantum yield (ϕem) in the range of 0.127–0.171. In contrast, the tricarbonyl dinuclear Re(I) complexes exhibit LC [π→π∗(phen)] phosphorescence with ϕem from 0.0498 to 0.0625.

A new series of luminescent diisocyanide-bridged homodinuclear Re(I) complexes and their mononuclear analogues have been synthesized. The X-ray crystal structures of two of the dinuclear complexes were determined. The photophysical and electrochemical properties of these complexes have been investigated.Figure optionsDownload as PowerPoint slide