Add time:09/09/2019         Source:sciencedirect.com

A new bis-bidentate ligand, 1-[(5-methyl-2,2′-bipyridin-5′-yl)-methyl-1H-pyrazol-3-yl]-pyridine (L1), was designed and synthesized. The reactions of the ligand with [Cu(CH3CN)4]ClO4, Cu(ClO4)2·6H2O, AgNO3 and Cd(NO3)2·4H2O were carried out and dinuclear double helical complexes [CuI2L12][ClO4]2·CH3CN·0.5H2O (1), [CuII2L12(H2O)(CH3CN)][ClO4]4 (2), [AgI2L12](NO3)2·CH3CN (3) and [CdII2L12(NO3)4]·2H2O (4) were obtained and characterized by single crystal X-ray diffraction analyses, mass spectra, 1H NMR, and UV–Vis spectra. A dinuclear complex [NiII2L12(DMF)4](ClO4)4·H2O (5) was obtained by the reaction of the ligand with Ni(ClO4)2·6H2O. The results indicate that the formation of helicates is influenced by the structure of the bidentate ligand and the coordination geometry of the metal ions.

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