Syntheses, Crystal Structures, Magnetic and Luminescent Properties of Ni(Ⅱ), Cd(Ⅱ) and Pb(Ⅱ) Coordination Compounds Constructed from 5-Fluoronicotinic Acid

摘要

Five coordination compounds,namely [Ni2(5-Fnic)2(H2O)4] (1),[Ni(5-Fnic)(μ-5-Fnic) (H2biim)]n (2),{[Cd((μ-5-Fnic)2(H2O)2]·4,4'-bipy}n (3),[Pb2(μ-5-Fnic)2(μ3-5-Fnic)2(H2O)2]n (4),and [Pb(5-Fnic)2(4,4'-bipy)(H2O)] (5),have been constructed hydrothermally'using 5-FnicH (5-FnicH =5-fluoronicotinic acid),H2biim (H2biim =2,2'-biimidazole),4,4'-bipy (4,4'-bipy =4,4'-bipyridine),NiCl2·6H2O,CdCl2·H2O and PbCl2.The products were isolated as stable crystalline solids and were characterized by IR spectra,elemental analyses,thermogravimetric analyses (TGA),and single-crystal X-ray diffraction analyses.Structures of 1～5 range from discrete 0D monomers (1 and 5) to 1D coordination polymers (2 and 4) and 2D metal-organic network (3).A broad structural diversity of 1～5 is guided by the type of the metal(Ⅱ) node and the introduction of auxiliary ligands.The magnetic (for 2) and luminescent (for 3～5) properties were also investigated and discussed.