Abstract
By using the carboxyphosphonic acid as the ligand, eight new three-dimensional (3D) lanthanide carboxyphosphonates, namely Ln[L(H2O)2]·2H2O (Ln = Ce (1), Pr (2), Nd (3), Sm (4), Eu (5), Gd (6), Y (7), Tb (8); H3L = H2O3PCH2–NC5H9–COOH) have been synthesized under hydrothermal conditions and structurally characterized by X-ray single-crystal diffraction, X-ray powder diffraction, infrared spectroscopy, elemental analysis and thermogravimetric analysis. The eight isomorphous compounds feature a 3D framework structure. In these compounds, the inorganic chains based on LnO8 and CPO3 polyhedra are interconnected through carboxyphosphonate ligands to form a 3D framework structure with a channel system. The result of connections in this manner is the formation of 40- and 24-atom rings that run in the a- and b-axis directions. The luminescence properties of compounds 5 and 8 have also been studied.
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