Abstract
A three lanthanide-based coordination compounds of [Sm4(NIPH)5(ox)(H2O)5](H2O)4 (1), [Eu4(NIPH)5(oba)(H2O)5](H2O) (2) and [Eu2(NIPH)3(H2O)14](H2NIPH)(H2O)6 (3) (H2NIPH = 5-nitroisophthalic acid, ox = oxalic acid, H2oba = 4,4′-oxydibenzoic acid) were synthesized by hydrothermal reaction and characterized by single-crystal X-ray diffraction. These compounds contain an -Ln-O-C-O-Ln- zigzag chain, which connect to each other through the oxygen atoms of the H2NIPH ligands to form a wave-like layer. These layers are bridged by oxalate or H2NIPH ligands to generate three-dimensional coordination framework. Within these compounds, porous structure with one-dimensional channels which were filled with isolated organic ligands or lattice water molecules are also observed. Fascinatingly, these lattice water molecules display unprecedented water morphology and play important roles in the stabilizing the whole network. In addition, these compounds show strong photoluminescence at room temperature, respectively, and may be good candidates for potential luminescence materials.
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