Novel self-assembled metallo-homopolymers and metallo-alt-copolymer containing terpyridyl zinc(II) moieties

Abstract

A series of novel terpyridyl Zn(II)-based metallo-polymers, including metallo-homopolymers and metallo-alt-copolymer, containing carbazole pendants attached to the C-9 position of fluorene by long alkyl spacers were constructed by self-assembled reaction. The integrated ratios of H-1 NMR reveal a facile result to distinguish the differences between metallo-homopolymers and copolymers. To further investigate these polymers, UV-vis and PL spectral titration experiments were also carried out by varying the molar ratios of zinc(II) ions to monomers. The photophysical properties of these polymers exhibited blue PL emissions (around 420 nm) with quantum yields of 11-23% (in DMF) and the PL results revealed that the formation of excimers were suppressed by the incorporation of carbazole pendant groups. In addition, the EL results showed green EL emissions ( around 550 nm) with turn-on voltages of 6.0-6.5 V, maximum efficiencies of 0.85-1.1 cd A(-1) (at 100 mA cm(-2)), and maximum luminances of 1704-2819 cd/m(2) (around 15 V), correspondingly.