Synthesis and Properties of two CuI Complexes Involving Tetrathiafulvalene-Fused Phenanthroline Ligand

Abstract

Two Cu^I complexes based on the π-conjugated tetrathiafulvalene-annulated phenanthroline ligands (TTF-Phen, L₁ and L₂), [Cu^I(Xantphos)(L₁)]BF₄ (1, Xantphos = 9,9-dimethyl-4,5-bis(diphenylphosphino)xanthene) and [Cu^I(Binap)(L₂)]BF₄ (2, Binap = 2,2’-bis(diphenylphosphino)-1,1’-binaphthyl), have been synthesized. They have been fully characterized, and their photophysical and electrochemical properties are reported together with those of L₁ and L₂ for comparison. Both Cu^I complexes show metal-to-ligand charge transfer (MLCT) absorption bands, whereas the ³MLCT luminescence is strongly quenched.