Synthesis And Characterization Of Photoluminescence Polymers Containing Amido Iridium Complex

A series of photoluminescent iridium complexes and their homopolymers and copolymers have been synthesized. It is the first time that amide derivant to be applied in luminescent materials. Iridium monomers (ppy)₂Ir(N-phMA) 1, (ppy)₂Ir(N-MephMA) 2, (ppy)₂Ir(N-NaphphMA) 3, (cpy)₂Ir(N-phMA) 4, (pq)₂Ir(N-phMA) 5 and (bo)₂Ir(N-phMA) 6 had been successfully synthesized by reacting corresponding iridium dicholoro complexes with amide using CH3ONa catalysis at room temperature. Then, radical polymerization using those monomers gained corresponding homopolymers: (ppy)₂Ir(N-phMA) homopolymer 7 and (pq)₂Ir(N-phMA) homopolymer 8; and copolymers: ((ppy)₂Ir(N-phMA))-(N-Vinyl carbazole)-copolymers 9-14, ((pq)₂Ir(N-phMA))-(N-Vinyl carbazole)-copolymer 15, ((pq)₂- Ir(N-phMA))-(styrene)-copolymer 16, (N-phenyl methacrylamide)-(N-Vinyl carbazole)- copolymer 17, (N-phenyl methacrylamide)-(styrene)-copolymer 18; polymers: 19-24, 25-30 which were obtained by reacting copolymer 17 and 18 with (ppy)₂Ir(μ-Cl)₂Ir(ppy)₂ respectively. The structures of monomers were confirmed by IR, 1HNMR, element analysis and x-ray diffraction while the polymers, molecular weight determined by GPC, were characterized by 1HNMR. The thermal stability properties of these complexes were studied by DSC. The luminescence character of these complexes was studied by ECL, UV and fluorescence emission spectra. The emission spectra revealed that complex (ppy)₂Ir(N-phMA) and its macromolecule polymers were observed their max emission wavelength around 520 nm, but the intensity of polymers are much stronger than the small molecule complex (ppy)₂Ir(N-phMA). Complex (pq)₂Ir-(N-phMA) and its macromolecule polymers were observed their emission wavelength around 580 nm, and the intensity of polymers are also much stronger than the small molecule. The results indicate that these complexes have strong luminescence properties and can be applied as potential materials in PLEDs.