Synthesis, X-ray structure and luminescent properties of a new 1D terbium(III) coordination polymer based on 2,4-dichlorophenoxyacetate and 4,4'-bipyridine

摘要

A new ID terbium coordination polymer, {[Tb(2,4-dcpa)3(H_2O)_2]-(4,4'-bpy)_(1.5)(H_2O)_2}_n (1) [2,4,-dcpa=2,4-dichlorophenoxyacetate, 4,4'-bpy=4,4'-bipyridine], was prepared by hydrothermal synthesis and characterized by IR spectroscopy, elemental analysis, thermogravimetric analysis (TGA) and single-crystal X-ray diffraction. Complex 1 exhibits an infinite chain structure with a {Tb_2(2,4-dcpa)_6(H_2O)_4} dimeric repeat unit. Each Tb~(3+) ion is nine-coordinated to two water molecules, one monodentate car-boxylate group and four bridging carboxylate groups in which the carboxylate groups are bonded to the terbium ion in one modes: the chelating-bridging tridentate. Three-dimensional fluorescence spectra of 1 were detected at room temperature under the excitation and the emission wavelengths in the range of 420-750 nm with the interval of 5 nm. The lifetime of 1 in solid-state at room temperature up to 1.132 ms. On the other hand, poor luminescence efficiency has been noted for the Tb~(3+)-2,4-dcpa complex.