高分子化8-羟基喹啉及其金属配合物的合成与光谱分析

Syntheses and Spectral Analyses of A Polymer with 8-hydroxyquinoline Side Group and Its Metal Chelate Complexes

通过缩合反应将氯甲基化8-羟基喹啉接枝到丙烯酰胺-丙稀酸共聚物主链上,形成带8-羟基喹啉侧基的高聚物,采用红外光谱、紫外-可见光吸收光谱分析了高聚物的结构。由于主链上存在大量水溶性基团,所得产物具有较好的水溶性。制备了高分子化的8-羟基喹啉的几种金属配合物,采用荧光光谱对8-羟基喹啉高聚物及其金属配合物进行测试,结果显示这些金属配合物具有较好的光致发光性能。

A water-soluble polymer with 8-hydroxyquinoline-side group, poly-acrylamid （5-methylene-8-hydroxyquinol） acrylic acid （AMAA-HQCH2）, was synthesized. Spectral Analyses were carried with a Fourier transform infrared spectrometer, an UV-vis spectrophotometer and a fluorescence spectrophotometer. The FT-IR spectra suggested that the 8-hydroxyquinoline group links to the amido of the copolymer acrylamid-acrylic acid through methylene. The polymer can form water soluble chelate complexes with metal ions such as Mg（ Ⅱ ）, Ca（ Ⅱ） and Cd（ Ⅱ） without precipitation. The polymer can also form chelate complex with Cu（ Ⅱ） soluble in DMF/water mixed solution with volume ratio of 1 ： 1. On the UV-vis absorption spectra of polymer AMAA-HQCH2, a weak absorption at 268 nm and an intense absorption at 305 nm, attributed to the n-π^＊ and π-π^＊ transition of 8-hydroxyquinoline group, could be observed. The absorption at 268 nm became weaker after polymer chelates with the metal ions. The PL spectra of AMAA-HQCH2 and its chelate complexes showed that polymer AMAA-HQCH2 can emit weak fluorescence and that the chelate complexes can emit obvious fluorescence in range 410-620 nm.