含吡啶羧酸钐配合物的合成及荧光性能的研究

以SmCl3·6H2 O、2,2忆鄄联吡啶鄄3,3忆鄄二羧酸(H2 bpdc)、对苯二甲酸(H2 bdc)、H2O 为原料,采用水热法合成了一种新的双核吡啶羧酸类配位聚合物Sm2 (bpdc)(bdc)2 (H2O)2 ]n ,该配合物晶体呈透明片状。讨论了反应物单体配比、溶剂量、不同温度以及体系pH 对配合物合成的影响,确定最佳合成条件为:反应物配比SmCl3·6H2 O、H2bpdc 和H2 bdc 物质的量之比为2颐2颐1,溶剂为5 mL 去离子水,pH =5,160 益恒温72 h,降温速度2 益/ h。X鄄射线单晶衍射、TGA 及荧光性能测试结果表明:该晶体属于单斜晶系,C2/ c 空间群;热稳定性较好,骨架在418 益以下可以稳定存在;具有良好的荧光特性,Sm3 + 离子发生高效辐射跃迁。

Synthesis and fluorescence properties of a samarium complex with a pyridine-carboxylic acid

A novel dinuclear pyridine carboxylic acid coordination polymer, ［Sm2(bpdc)(bdc)2(H2O)2］n (H2bpdc = 2,2′-bipyridyl-3,3′-dicarboxylate, H2bdc=1,4 benzenedicarboxylate) has been hydrothermally synthesized. The resulting crystals were colorless transparent sheets. We discuss the influence of the reactant ratio, solvent, temperature and pH on the synthesis. The optimized reaction conditions were found to be a reaction temperature of 160℃, a reaction time of 72h, a cooling rate of 2℃/h, pH=5, with 5mL of deionized water as solvent, and a molar ratio of SmCl3·6H2O:2,2′-bipyridyl-3,3′ dicarboxylate:1,4-benzenedicarboxylicate of 2:2:1. IR, PXRD, luminescence analysis, TG and single-crystal X-ray diffraction showed that the compound crystallizes in the monoclinic system, space group C2/c, is thermally stable up to 418℃, and shows intense fluorescence properties with highly effective radiative transitions.