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Structures, luminescent and magnetic properties of a series of (3,6)-connected lanthanide-organic frameworks
Yin-Ling Hou1, Rui-Rui Cheng, Gang Xiong
1Department of Chemistry, Key Laboratory of Advanced Energy Material Chemistry, MOE, TKL of Metal and Molecule Based Material Chemistry, and Synergetic Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin 300071, China. zhaobin@nankai.edu.cn.
Abstract:
Through hydrothermal reactions with corresponding lanthanide nitrates and 4-(4-carboxyphenylsulfonyloxy)-3-metnoxybenzoic acid (H2vspc), seven novel three-dimensional (3D) lanthanide-organic frameworks ([Ln(vspc)(Hvspc)(H2O)]n [Ln = Pr (1), Eu (2), Gd (3), Tb (4), Dy (5), Ho (6) and Er (7)]) have been synthesized and structurally characterized. All of them are isostructural and crystallize in the monoclinic crystal system, P21/c space group. Their structures feature a (3,6)-connected topological network, in which Ln(3+) were connected by carboxylate groups to give a 1D lanthanide chain, and the adjacent chains are further spanned by vspc(2-) and Hvspc(-) anions to form a 3D framework. The luminescent properties and lifetimes of 2 (Eu(III)), 4 (Tb(III)), and 5 (Dy(III)) have been studied, and the corresponding luminescent lifetimes are 0.53, 0.99 and 0.014 ms, respectively. The magnetic investigations reveal that compound displays weak antiferromagnet interaction, 4 and 5 exhibit ferromagnetic coupling, and compound 5 exhibits slow magnetic relaxation behavior.
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