Synthesis,Characterization,and Optical Properties Of Cu Complexes With Novel Ligands Containing Fluorene Group

Fluorene due to its strong ability of modification and absorbance were liked by the researchers.In this article,a series of the transition metals copper complexes containing fluorene substituents are prepared,and their optical properties are studied.Firstly,1,10-phenanthroline?L0?as raw materials,prepared phenanthroline derivatives 1H-imidazo[4,5-f][1,10]-phenanthroline?L1?and 2-?9H-fluoren-2-yl?-1H-imidazo[4,5-f][1,10]phenanthroline?L2?,the imidazole ring and a fluorenyl group,making the extent of ligand conjugated increased,resulting in the UV-vis absorption spectrum of the lowest absorption peak had a red shift.In addition,through theoretical calculations to study the influence of the frontier molecular orbitals and charge distribution and transfer type with the introduction of fluorene.Then,L0,L1andL2asanitrogen-containingligands,bis?2-diphenylphosphino?phenyl)ether?POP?asaP-containingligands,and tetrakis?acetonitrile?copper?I?hexa-fluorophosph?Cu?CH₃CN?₄PF₆?prepared the Cu?I?complexes P0,P1 and P2.Theoretical analysis the influence of the frontier molecular orbitals and charge distribution and transfer type of the Cu?I?complexes with the introduction of fluorene.At the same time the introduction of the fluorene make the complexes in the visible light absorption ability have certain to improve,and complexes fluorescent life also had the very big enhancement,reached 51.23?s.Finally,we synthesized a series of azole ligand?2-pyridyl imidazole,2-?1H-1,2,4-triazol-3-yl?pyridine,4-?2H-5-tetrazole?-pyridine?,then introduced the P-containing ligands POP prepared its corresponding transition metal copper complex P3,P5 and P6,then make the fluorene introduced to the 2-pyridyl imidazole be formed on the new ligand L4,and synthesized its copper complex P4.Then,the optical properties of the complexes were tested.Because of the vibration frequency of N-H is weaker than C-H,with the increase of the N atoms in the ligand,the probability of luminescent quenching caused by vibration was reduced,and increased the quantum efficiency and excited lifetime.When the fluorene is introduced into the imidazole ring,the transition probability of the MLCT,and the absorption ability of the P2 at the visible light region were improved.At the same time increase the life span of the excited state.