Two Types of Lanthanide Coordination Polymers Based on a Homophthalate Ligand Exhibiting Luminescence and a Significant Magnetocaloric Effect
Two Types of Lanthanide Coordination Polymers Based on a Homophthalate Ligand Exhibiting Luminescence and a Significant Magnetocaloric Effect
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DOI：
10.1021/acs.cgd.7b00501
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发表时间：
2017-05
影响因子：
3.8
通讯作者：
Zhongyi Li;Yan Chen;Xinglong Dong;B. Zhai;Xiangfei Zhang;Chi Zhang;Fuli Zhang;Suzhi Li;
中科院分区：
文献类型：
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作者：
Zhongyi Li;Yan Chen;Xinglong Dong;B. Zhai;Xiangfei Zhang;Chi Zhang;Fuli Zhang;Suzhi Li;
采用溶剂热法合成了两种基于高邻苯二甲酸（H2 HPA）的镧系配位聚合物：一维{[Ln（HPA）（NO3）（H2O）2]·H2O}n（Ln = Eu（1）; Gd（2）; Tb（3）; Dy（4））和二维{[Ln 2（HPA）3（H2O）2]·H2O}n（Ln = Eu（5）; Gd（6）; Tb（7）; Dy（8））.化合物1-4显示由HPA 2-连接基和[Ln 2]簇单元组成的一维（1D）线性链结构。化合物4-8是晶体学上同结构的，含有由相邻的Ln 3+离子和H2 HPA配体的羧基构建的一维镧系羧酸盐构建单元[Ln 4（CO 2）10]n，其可以通过HPA 2-的连接进一步得到二维层状结构。磁性研究表明，具有各向同性Gd 3+离子的配合物2和6表现出显著的低温磁热效应，在2 K和7 T下的最大−ΔSm值分别为35.58和35.41 J kg-1 K-1.此外，1/5和3/7的固态光物理性质分别显示出较强的Eu ~（3+）和Tb ~（3+）光致发光特性。
Two types of lanthanide coordination polymers based on homophthalic acid (H2HPA), one-dimensional {[Ln(HPA)(NO3)(H2O)2]·H2O}n (Ln = Eu (1); Gd (2); Tb (3); Dy (4)) and two-dimensional {[Ln2(HPA)3(H2O)2]·H2O}n (Ln = Eu (5); Gd (6); Tb (7); Dy (8)), were solvothermally synthesized. Compounds 1–4 show a one-dimensional (1D) linear chain structure consisting of a HPA2– linker and [Ln2] cluster unit. Compounds 4–8 are crystallographically isostructural and contain 1D lanthanide-carboxylate building units [Ln4(CO2)10]n built from the adjacent Ln3+ ions and carboxyl groups of the H2HPA ligands, which can further give two-dimensional layer structures via the link of HPA2–. The magnetic studies reveal that complexes 2 and 6 with isotropic Gd3+ ion exhibit significant cryogenic magnetocaloric effects with a maximum −ΔSm value of 35.58 and 35.41 J kg–1 K–1 at 2 K and 7 T, respectively. In addition, the solid-state photophysical properties of 1/5 and 3/7 respectively display strong characteristic Eu3+ and Tb3+ photol...