| The pyridine carboxylic acid ligands have been employed to construct coordination polymers with a great diversity of coordination modes and produce the novel structure and topology.In addition,the coordination polymers show potential application in the aspects of magnetic,adsorption,optical and catalytic properties.Therefore,this paper select 2,2'-bipyridine 3,3',6,6'-tetracarboxylic acid?H4L?as organic ligand,fumbling with the optimum synthesis conditions of the transition metal coordination polymers.Furthermore,the properties of the coordination polymers have been studyed in detail.In this paper,we employed 2,2'-bipyridine-3,3',6,6'tetracarboxylic acid and obtained ten complexes:[CuL0.5]n?1?,[CuL'0.5?H2O?2]n?2?,[Cu2L'?H20?2]n?3?,[Cu2L'00.5?OH?2·H2O]n?4?,[CuL0.5?phen??H20?]n?5?,[Cu4L2?phen?2?H20?4]n?6?,[Ag8L2?4,4'-bipy?3?H20?]n?7?,[Zn2?H2L?2?H20?4-4H20]n?8?,[Zn6L3?H20?,3·H20]n?9?,[Cd2L?H20?5]n?10?.Complex 1 is obtained by heating treatment of the complex[?CuL0.5H2O?-H2O]n?la?and induced by single crystal to single crystal transformation.Structure determination showed that 1 is a 3D structure when get from the dehydrated 1D structure 1a and magnetic analysis indicate 1 and la are weak ferromagnetic and antiferromagnetic,respectively.Furthermore,the complexes la and 1 show good selective catalysis on the synthesis of imidazoline.In the synthesis process of complexes 2-4,the 2,2'-bipyridine 3,3',6,6'-tetracarboxylic acid showed in situ reaction and obtained new H4L' ligand.The H4L' and Cu?II?ions are empolyed to construct three new complexes.It was found that temperature and pH value are the main factors that induce in situ reaction.Complexes 5 and 6 are OD binuclear and 1D tetranuclear Cu?II?complexes,respectively.Complexes 7-10 are synthesized from transition metal containing a10 electron and possessed fluorescence properties. |
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