| 氯代芳香羧酸与联吡啶配体构筑的四种稀土配合物的晶体结构、热分析和荧光性质 |
| Four Rare Earth Complexes with Chlorinated Carboxylic Acids and Bipyridine Ligands: Crystal Structures, Thermal Analysis and Luminescence Properties |
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| 摘要: 利用2种氯代芳香羧酸（3，4-二氯苯甲酸和3，5-二氯苯甲酸，分别简写为3，4-HDClBA和3，5-HDClBA）与5，5'-二甲基-2，2'-联吡啶（5，5'-DM-2，2'-bipy）配体在溶剂热或常温反应的条件下成功地合成了4种稀土配合物[Ln2（5，5'-DM-2，2'-bipy）2（3，4-DClBA）6（H2O）（C2H5OH）]（Ln=Sm（1），Eu（2））和[Ln（5，5'-DM-2，2'-bipy）（3，5-DClBA）3]2（Ln=Sm（3），Eu（4））。配合物1和2是同构的，每个中心离子是八配位的扭曲四方反棱柱的几何构型，分子与分子之间通过C-H…Cl氢键和π-π堆积作用形成二维的超分子结构。配合物3的几何构型为九配位的单帽四方反棱柱体，分子与分子之间通过不同的π-π堆积作用形成二维的超分子结构。利用热重红外联用技术研究了配合物1~4的热稳定性和热分解机理。对配合物2和4进行了荧光以及荧光寿命研究，结果表明2个配合物都能发射Eu3+离子的特征荧光。 |
| 关键词: 稀土配合物 合成 晶体结构 热分析 荧光性质 |
| 基金项目: 国家自然科学基金（No.21803016）资助项目。 |
| Abstract: Four new complexes were successfully synthesized by solvothermal method or conventional solution method, namely [Ln2(5,5'-DM-2,2'-bipy)2(3,4-DClBA)6(H2O)(C2H5OH)] (Ln=Sm (1), Eu (2)) and [Ln(5,5'-DM-2,2'-bipy) (3,5-DClBA)3]2 (Ln=Sm (3), Eu (4); 3,4-HDClBA=3,4-dichlorobenzoic acid, 3,5-HDClBA=3,5-dichlorobenzoic acid, 5,5'-DM-2,2'-bipy=5,5'-dimethyl-2,2'-bipyridine). Complexes 1 and 2 are isostructure and each metal center is eight-coordinated forming a distorted square antiprismatic. Complexes 1 and 2 are connected to form 2D supermolecular structure by C-H…Cl hydrogen bonding and π-π interactions. The geometry of complex 3 is a nine coordinated distorted monocapped square antiprismatic, and the two-dimensional supramolecular structure is formed by different π-π stacking interactions between molecules. Thermogravimetric-infrared combined technology revealed the thermal stability and thermal decomposition mechanism of complexes 1~4. The fluorescence and lifetime of complexes 2 and 4 were studied. The results showed that both complexes could emit the characteristic fluorescence of Eu3+ ions. |
| Keywords: rare earth complexes synthesis crystal structures thermal analysis luminescent properties |
| 投稿时间：2020-04-29 修订日期：2020-09-21 |
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| 周孟雪,任宁,张建军.氯代芳香羧酸与联吡啶配体构筑的四种稀土配合物的晶体结构、热分析和荧光性质[J].无机化学学报,2020,36(12):2349-2358. |
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