高分子化8-羟基喹啉锂的合成和发光特性的研究

以LiOH与5(2甲基丙烯酰乙氧基甲基)8羟基喹啉反应合成8羟基喹啉锂(Liq)配合物单体,并与甲基丙烯酸甲酯共聚合成含有高分化的8羟基喹啉锂.1HNMR、TGA、元素分析确定了单体的组成为Li(C9H5NO)CH2OCH2CH2OOCC(CH3)CH2·H2O.与聚甲基丙烯酸甲酯比较,共聚物热稳定性高.Liq含量<15wt%时共聚物能够溶于普通溶剂.紫外吸收、激发光谱、光致(PL)发光谱说明单体和共聚物的发光来自于Liq基团.单体和共聚物发蓝光.同时对共聚物的二甲基甲酰胺、二甲亚砜和四氯乙烷溶液制备的薄膜的光致发光光谱进行了比较,证明溶剂影响Liq基团上共轭电子的离域程度,对发光光谱有调节作用.

SYNTHESIS OF 8-HYDROXYQUINOLINE LITHIUM-CONTAINING COPOLYMERS AND THEIR PHOTOLUMINESCENCE BEHAVIOR

8-Hydroxyquinoline lithium (Liq)-containing copolymers were synthesized by free radical copolymerization of methyl methacrylate (MMA) and a Liq-pendant monomer prepared by LiOH and 5-(2-methacryloylethyloxymethyl)-8-quinolinol.The structure of the monomer,Li(C_9H_5NO)CH_2OCH_2CH_2OOCC(CH_3)-CH_2·H_2O,was characterized and confirmed by ()~1H-NMR,TGA and elemental analysis.Compared to PMMA,the copolymer was more thermally stable.The copolymers with Liq-content<15 wt% can be dissolved well in common solvents. Ultraviolet-visible absorption,PL spectra proved that the luminescent centers mostly came from the Liq units.The monomer and the copolymer were blue-emitting materials.It was found that the solvents,such as DMF,DMSO,which affected the conjugated electrons in quinolinolate groups can be used to modify the color of the luminescence of the copolymer cast films.