3,5-二硝基水杨酸铕/聚合物的合成及光致发光性能

合成了3,5-二硝基水杨酸铕配合物(EuDNS)及其聚合物材料，通过元素分析和红外光谱等测试技术推测了配合物的结构，考察了配合物的用量和聚合物基质对聚合物材料荧光性能的影响。 结果表明，配合物EuDNS可能存在的螯合杂环结构使其有较宽的紫外吸收，且与其荧光激发波长能较好的吻合，能发射很强的稀土Eu3+离子特征红光；当EuDNS质量分数为0.25%时，EuDNS/PMMA（甲基丙烯酸甲酯）聚合物材料仍有很强的荧光强度；3种不同聚合物基质中，最强发射峰强度顺序为:P(MMA-co-St)＞PMMA＞P(MMA-co-AA)，丙烯酸（AA）共聚单体会强烈猝灭材料发光；EuDNS对MMA/St自由基共聚有阻聚和缓聚作用，随苯乙烯（St）的比例提高，阻聚作用增大，且材料透明性降低；与EuDNS配合物相比，EuDNS/PMMA聚合物材料形成后表观荧光寿命延长了467.5 μs。

Synthesis and Photo-Luminescence Properties of 3,5-Dinitro Salicylic Acid Europium/Polymer Materials

3,5-Dinitro salicylic acid Eu(Ⅲ) complex(EuDNS) and its polymer composites were synthesized. The complex and polymers were characterized by elemental analysis, IR, UV-Vis methods. Effects of the complex content and polymer materials on the fluorescence property were studied. The complex may form a chelate heterocyclic structure and result in a wide UV-Vis absorption band that is well matched to excited wavelength, so that the complex can emit strong characteristic red luminescence of Eu(Ⅲ) ion. Even if the mass fraction of complex is 0.25%, EuDNS/PMMA(PMMA:polymethyl-methacrylate) polymer has still very strong fluorescence property. The order of the emission from strong to weak for the copolymers is:P(MMA-co-St)＞PMMA＞P(MMA-co-AA)(AA:acrylic acid). The acrylic acid comonomer can quench luminescence. The results show the inhibition and retardation effects of the complex on free radical copolymerization of styrene/methyl methacrylate initiated with azobisisbutyronitrile at 60 ℃, and the inhibition effect increases with the increasing styrene(St) comonomer content, whereas P(MMA-co-St) transparence decreases. The EuDNS/PMMA polymer has a longer apparent fluorescent lifetime than the corresponding complex.