双齿席夫碱配基功能化的聚苯乙烯与Eu(Ⅲ)离子配合物的制备及其发光特性

Preparation and luminescent characteristics of complexes formed by bidentate Schiff base ligand-functionalized polystyrene and Eu(Ⅲ)ion

通过几步大分子反应过程,将双齿席夫碱(SB)配基键合在聚苯乙烯(PS)侧链,制得了双齿席夫碱配基功能化的聚苯乙烯PS-SB。使大分子配体PS-SB与Eu(Ⅲ)离子螯合配位,制备了二元高分子-稀土发光配合物PS-(SB)3-Eu(Ⅲ),也以邻菲罗啉(Phen)为小分子第二配体,制备了三元高分子-稀土发光配合物PS-(SB)3-Eu(Ⅲ)-(Phen)1。研究结果表明,键合的双齿席夫碱(SB)配基兼具有螯合配位与传能敏化双重功能,所制备的高分子-稀土配合物均能发射出很强的Eu(Ⅲ)离子的特征荧光。大分子配体PSSB本身具有强的荧光发射,但与Eu(Ⅲ)离子配位后,其自身的荧光发射大为减弱,通过配合物分子内能量转移,可强烈地敏化Eu(Ⅲ)离子发光。

Bidentate Schiff base(SB)ligand was bonded on the side of polystyrene(PS)via several steps of polymer reactions,and the bidentate Schiff base ligand-functionalized PS,PS-SB,was obtained.The macromolecular ligand,PS-SB,was allowed to coordinate to Eu(Ⅲ)ion,resulting in the binary polymer-rare earth complex PS-(SB)3-Eu(Ⅲ).At the same time,with phenanthroline as second ligand,the ternary polymer-rare earth complex PS-(SB)3-Eu(Ⅲ)-(Phen)1was also prepared.The experimental results show that the bond bidentate Schiff base ligand SB possesses the dual functions of coordination chelating and energy transfer-sensitization towards rare earth ion,and the prepared complexes can emit strong characteristic fluorescence of Eu(Ⅲ)ion.The macromolecular ligand PS-SB itself has strong fluorescence emission.However,after coordinating with Eu(Ⅲ)ion,the fluorescence emission of its own weakens remarkably,and strengthly sensitized the fluorescence emission of Eu(Ⅲ)ion via the intramolecular energy transfer.