The Synthesis,Structures And Properties Of Tripyridine Olefin-based Coordination Polymers

As a new type of organic inorganic hybrid material,coordination polymers is becoming a hot topic in luminescent materials in recent years.This is not only because both inorganic ions and organic ligands can provide luminescent sites,but also because charge transfer can often occur after the coordination between organic ligand and metal,leading to luminescence in another dimension.In addition.some guest molecules bound in coordination polymers can emit and/or induce luminescence.At the same time.Photoactive coordination polymers have attracted extensive attention due to their high sensitivity,portability,short response time and adaptability to both solid and liquid phases in fluorescence detection.In this thesis.xve constructed a series of CPs by the assembly of a Bipyridylamine ligand,Di-pyridin-2-yl-[4-(2-pyridin-4-yl-vinyl)-phenyl]-amine(ppvppa)with Zn(?),Cd(?),Ni(?),and Ag(I)and investigated their performances in the luminescent detection of Cr(?)ions in aqueous media and their photocurrent responses.The detailed research are described as followed:1.Solvothermal reactions of Zn(NO3)2·6H2O/Cd(NO3)2·gH2O/Ni(NO3)2·6H2O,ppvppa and different dicarboxylic acids afforded three coordination polymers{Zn(ppvppa)(5-NO2-1,3-BDC)(H2O)}n(1),{[Cd(ppvppa)2(2,5-fdc)]·2H2O} n(2),{[Ni(ppvppa)(5-NO2-1,3-BDC)(H2O)]· MeCN} n(3).As these CPs exhibit good photoluminescent performances and contain uncoordinated pyridyl group as active sites,they were employed in detecting chromium(Cr2O72-and CrO42-)in aqueous phase and have shown low detection limits(ppb level)and high selectivity.The detecting mechanisms were proposed and approved by a designed experiment.2.Solvothermal reactions and diffusion reactions of ppvppa and Ni(?)/Ag(?)salts produced four CPs[Ag(ppvppa)·BF4]n(4),[Ag(ppvppa)(H2O)·PF6]n(5),[Ag(ppvppa)·NO3]n(6),{[Ag2(ppvppa)2]·2,3-NDC}n(7),and{[Ni(ppvppa)(2,3-NDC)(H2O)]·2H2O}n(8).Compounds 4-8 are ID chain structures.The photocurrent responses of these CPs were studied.