N-heterocyclic carbene stabilized three coordinate Cu(I) complexes

Abstract

In this project, effectiveness of substituents existing on the ligands on the photophysical property of heteroleptic copper(I) complexes bearing both N heterocyclic carbenes (NHCs) and phenanthroline based ligands have been studied. Two N-heterocyclic carbene copper chloride (NHC-CuCl) ligands, IMes-CuCl, and Ipr-CuCl [IMes-CuCl = 1,3-bis(2,4,6-trimethylphenyl) imidazolium copper chloride, IPr-CuCl = 1,3-bis(2,6- diisopropyl)imidazole-2-ylidene copper chloride, complexes has been prepared. We delineate the synthesis of tri-coordinated copper complexes bearing bidentate phenanthroline based ligands in good yield from (IPr)Cu(Cl). In the thesis, synthesis of three coordinated NHC-copper(I) complexes; [(IPr)Cu(dafo)]PF6 (1), [(IMes)Cu(dafo)]PF6 (2), [(IPr)Cu(phendione)]PF6 (3) and [(IMes)Cu(phendione)]PF6 (4) (IPr = 1,3- bis(2,6-diisopropylphenyl)imidazole-2-ylidene, IMes = (1E,2E)-dimesityle ethane-1,2-diimine, dafo = 4,5-diazafluoren-9-one, phendione = 1,10- phenanthroline-5,6-dione, PF6 = Hexafluorophosphate have been explained. All the complexes have been characterized by NMR and Mass spectroscopic techniques. In addition, the photophysical properties were also studied.