Syntheses, crystal structures and properties of a series of isostructural lanthanide organic frameworks†

IF 2.6 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

CrystEngComm Pub Date : 2024-04-24 DOI:10.1039/D4CE00292J

Ming-Xue Guan, Hui-Zi Li, Shangda Li, Han-Jiang Yang, Fei Wang and Jian Zhang

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Abstract

Nine lanthanide–organic frameworks [Ln(L)_1.5(H₂O)₃] (1-Ce, 2-Dy, 3-Eu, 4-Gd, 5-Ho, 6-Nd, 7-Pr, 8-Sm, and 9-Tb; H₂L = 4,4′-(1,2-dihydroxyethane-1,2-diyl)dibenzoic acid) have been synthesized under solvothermal conditions. Single-crystal X-ray diffraction analyses show that compounds 1–9 are isomorphic, in which each Ln atom is linked by L ligands to form a 3D framework with an unprecedented 4,4,6-connected topology. All these compounds have excellent solvent stability and can remain stable in boiling water for up to a week. Moreover, these compounds exhibit metal-dependent luminescence and magnetic properties. 3-Eu and 9-Tb exhibit relatively good fluorescence properties, 4-Gd shows ferromagnetic coupling, and the other compounds present antiferromagnetic coupling.

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一系列等结构镧系元素有机框架的合成、晶体结构和特性

在溶热条件下合成了九种镧系有组织框架[Ln(L)1.5(H₂O)3]（1-Ce、2-Dy、3-Eu、4-Gd、5-Ho、6-Nd、7-Pr、8-Sm 和 9-Tb；H2L = 4, 4'-(1, 2-二羟基乙烷-1, 2-二基)二苯甲酸）。单晶 X 射线衍射分析表明，1-9 号化合物具有同构性，其中每个 Ln 原子都由 L 配体连接，形成了一个具有前所未有的 4, 4, 6 连接拓扑结构的三维框架。所有这些化合物都具有出色的溶剂稳定性，可在沸水中保持稳定长达两周。此外，这些化合物还具有与金属相关的发光和磁性。3-Eu 和 9-Tb 具有相对较好的荧光特性，4-Gd 具有铁磁耦合，而其他化合物则具有反铁磁耦合。

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