Synthesis, crystal structure and properties of three ternary dysprosium 2-halogenated benzoic acid complexes

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 chela...