| 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. |
