Synthesis and Luminescence of New Cu(I) Complexes Containing a Binap Ligand and a Diimine Ligand

Abstract

Abstract A series of novel Cu(I) complexes with an s-binap ligand and a diimine ligand, [Cu(s-binap)(bpy)]PF6, [Cu(s-binap)(phen)]PF6, and [Cu(s-binap)(dmp)]PF6, were synthesized, where bpy = 2,2′-bipyridine, phen = 1,10-phenanthroline, dmp = 2,9-dimethyl-1,10-phenanthroline, and s-binap = (S)-2,2′-bis(diphenylphosphino)-1,1′-binaphthyl. All three complexes show intense photoluminescence in the solid state, whereas [Cu(s-binap)(dmp)]PF6 is a comparatively good emitter in CH2Cl2 solutions. These luminescence bands have been assigned to the emission from 3MLCT states. The complexes [Cu(s-binap)(bpy)]PF6 and [Cu(s-binap)(dmp)]PF6 were characterized by X-ray structure analyses. Although the distorted tetrahedral structures around the central metals of the two complexes are similar, the photophysical properties of the dmp complex differ from those of the other complexes in solution. The structures and the photophysical properties of the three complexes have been discussed.