一种铱磷光配合物的合成表征及性能研究

Synthesis,Characterization and Light-physical Property of a Phosphorescent Iridium Complex

利用2-苯基吡啶(ppy)、三水合氯化铱(IrCl_3·3H_2O)和2-吡啶甲酸(pic)配位,得到铱配位物Ir(ppy)_2pic,合成产率>9 0%,该方法适合于Ir(ppy)2pic的批量制备。通过元素分析、核磁共振(~1H-NMR、^(13)C-NMR)和质谱(MS)对产物分子结构进行了表征,此外结合紫外吸收光谱(UV-Vis)和荧光光谱(PL)对其光物理性能进行了研究。结果表明:该配合物在紫外谱图上的250~300 nm处出现了强的配体单重态π-π*自旋跃迁吸收峰,在400~500 nm处出现了铱(Ш)到配体的单重态和三重态(~1MLCT和~3MLCT)电子跃迁吸收峰,在荧光光谱的514 nm处有较强的金属配合物三重态的磷光发射峰,显示为一种高效的绿色磷光材料。

A phosphorescent complex Ir（ppy） 2pic was synthesized by using the 2 -phenylpyridine as the cyclometalted ligand, 2 -picolinic acid as the ancillary ligand ,with the yield over 90% . The procedure of synthesis was suitable for mass production of Ir（ppy）2 pic. The complex was characterized by mass spec- trometry, NMR （^1H and ^13C）. The UV -Vis absorption and photoluminescence of the Iridium phosphores- cent complex Ir（ppy）2pic were investigated. The absorption spectrum of the complex shows intense high en- ergy transitions π-π＊ from 250 nm to 300 nm. as well as singlet and triplet electronic transition absorption peak from metal to ligand charge -transfer （^1MLCT and ^3MLCT） from 400 nm to 500 nm, and the complex also gives rise to a strong green photoluminescence with a peak at 514 nm. This Iridium（Ш） complex Ir （ppy）2 pic is a promising green phosphorescent material for its excellent performance.