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Abstract
Three ternary dysprosium complexes [Dy(2-ClBA)3 · phen]2 (1), [Dy(2-ClBA)3 · 2,2′-bipy]2 (2), and [Dy(2-BrBA)3 · phen]2 (3) (where 2-ClBAH = 2-ClC6H4COOH, 2-BrBAH = 2-BrC6H4COOH, phen = 1,10-phenanthroline, and 2,2′-bipy = 2,2′-bipyridine) have been synthesized and characterized by X-ray single crystal diffraction. Complex 1 consists of two independent binuclear molecules, [Dy(2-ClBA)3 · phen]2 (a) and [Dy(2-ClBA)3 · phen]2 (b), in which the coordination environment is similar. Each Dy3+ is nine coordinate with two nitrogens from phen and seven oxygens from five 2-ClBA groups. 2-ClBA groups coordinate to Dy3+ in three ways, bidentate chelating, bidentate-bridging and terdentate-bridging. Complexes 2 and 3 consist of one binuclear molecule. The crystal structure of 2 is similar to that of binuclear molecule (a) or (b) of complex 1. In 3, each Dy3+ ion is eight-coordinate by two nitrogens from phen and six oxygens from five 2-BrBA groups. 2-BrBA groups coordinate to the Dy3+ ion in two ways, bidentate chelating and bidentate-bridging. The complexes were studied by UV, DTA-TG, and fluorescence spectrometry.
Acknowledgements
We are grateful to the Natural Science Foundation of Beijing (No. 2073022), the Young Mainstay Teachers Foundation of Beijing Municipal Universities and the Beijing Key Lab of Nano-photonics and Nano-structure.