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首页> 外文期刊>RSC Advances >Crystal structures and luminescent properties of new lanthanide(III) complexes derived from 2-phenyl-4-pyrimidinecarboxylate
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Crystal structures and luminescent properties of new lanthanide(III) complexes derived from 2-phenyl-4-pyrimidinecarboxylate

机译：由2-苯基-4-嘧啶羧酸盐衍生的新型镧系元素（III）配合物的晶体结构和发光性能

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摘要

In this work, five novel lanthanide(III) coordination polymers derived from 2-phenylpyrimidine-4-carboxylic acid (Hppmc), namely, [Ln(ppmc)(3)(H2O)(2)]center dot 2H(2)O [Ln = Eu (1), Tb (2)] and [Ln(ppmc)(3)(H2O)(2)] [Ln = Eu (3), Gd (4), Tb (5)] were successfully synthesized by a facile solution method and characterized by single-crystal X-ray diffraction, power X-ray diffraction (PXRD), infrared (IR) spectroscopy, elemental analysis, and thermogravimetric analysis (TGA). It was found that subtly different reaction conditions result in disparate structural characteristics. For example, by combining Hppmc with lanthanide(III) ions at room temperature, compounds 1 and 2 featuring a carboxylate-bridging chain structure, in which the carboxylates adopt both chelating and bridging modes, are isolated. However, the reaction at 35 degrees C generates three isostructural compounds 3-5 with a distinct chain structure, in which the lanthanide ions are connected by carboxylates via syn-syn and syn-anti modes. Photoluminescent studies of the Eu3+ and Tb3+ complexes reveal that the Hppmc ligand is a better sensitizer for Tb3+ ion than for Eu3+ ion. The investigation of the relationship between the crystal structures and the photoluminescence properties indicate that the coordination environments of lanthanide ions and the arrangement of the ligands are the dominating factors that affect the luminescence behaviors of the solid samples.
机译：在这项工作中，从2-苯基嘧啶-4-羧酸（Hppmc），即[Ln（ppmc）（3）（H2O）（2）]中心点2H（2）O衍生出五种新型镧系元素（III）配位聚合物[Ln = Eu（1），Tb（2）]和[Ln（ppmc）（3）（H2O）（2）] [Ln = Eu（3），Gd（4），Tb（5）]已成功合成通过一种简便的溶液方法，并以单晶X射线衍射，功率X射线衍射（PXRD），红外（IR）光谱，元素分析和热重分析（TGA）为特征。发现不同的反应条件导致不同的结构特征。例如，通过在室温下将Hppmc与镧系元素（III）离子结合，可分离出具有羧酸盐架桥链结构的化合物1和2，其中羧酸盐采用螯合和桥联模式。然而，在35℃下的反应产生具有不同链结构的三种同构化合物3-5，其中镧系元素离子通过顺式-顺式和顺式-反式方式通过羧酸酯连接。 Eu3 +和Tb3 +配合物的光致发光研究表明，与Eu3 +离子相比，Hppmc配体对Tb3 +离子具有更好的敏化作用。对晶体结构与光致发光特性之间关系的研究表明，镧系离子的配位环境和配体的排列是影响固体样品发光行为的主要因素。

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