| Polyoxometalates （POMs） have been employed as an outstanding type of functionalinorganic building blocks for the synthesis of related compounds because of theircompositional diversity, nanoscale sizes and high charges. POM-based compounds haveattracted extensive interest not only for their intriguing topologies, but also for theirpotential applications in catalysis, medicine, material science and so on. In this paper,thirteen POM-based compounds have been synthesized and structurally characterized by IR,elemental analysis, thermogravimetric （TG） analyses, luminescent spectroscopy, XRPD andsingle-crystal X-ray diffraction. Magnetic properties have been investigated in thetemperature range of2–300K. The text has divided into three chapters which wereintroduced as follows:（I） Three novel transition metals substituted polyoxometakates （TMSPs） weresynthesized by the reaction of K14[As2W19O67（H2O）] and piperazine with Cu（Ac）2orMn（Ac）2, respectively. One novel fifteen-nuclear substituted Sandwich-type POM[（C4N2H9）2Cu9As6O3（H2O）2（OH）12(B-α-AsW9O33)2]·2H2O （1）, two three-nuclear substitutedSandwich-type POMs (C4N2H12)5[(C4N2H11)2Cu3(B-α-AsW9O33)2]·5H2O （2） and(C4N2H10)(C4N2H12)6[Mn3（H2O）3(B-α-AsW9O33)2]·15H2O （3）. Magnetic properties ofcompound1have been investigated（II） Four Keggin-based chiral nanoporous compounds：[（dpdo）4(GeW12O40)]·4H3O+·11H2O （4）,[（dpdo）4(GeMo12O40)]·4H3O+·11H2O （5）,[（dpdo）4(SiW12O40)]·4H3O+·11H2O （6）,[（dpdo）4(SiMo12O40)]·4H3O+·11H2O （7） have beenconstructed based on the achiral original materials GeO2or Na2SiO3, Na2WO4or Na2MoO4and4,4′-bipyridine-N,N’-dioxide （dpdo）. In addition, one POM-based nanoporouscompound [（dpdo）6.5(GeW12O40)2]·8H3O+（8） and supramolecular compound[（dpdo）3.5(GeMo12O40)]·4H3O+（9） also have been synthesized up on the same originalmaterials but different pH. The research of Keggin-based chiral compounds as catalyst in asymmetric cyanosilylation reactions have been carried out.（III） Four POMs-based polymers have been synthesized using [As2W19O67（H2O）]14- anion or GeO2、Na2MoO4（Na2WO4）, dpdo and Cu（Ac）2or Mn（Ac）2. Including one3Dcoordination polymer consists of six-nuclear transition metals substituted Sandwich-typePOMs {Na（H2O）2}[Na8{K（H2O）2}{K（H2O）3}2{Mn2As2W19O68（H2O）3}]·8H2On（10）,1Dcoordination polymer contained five-nuclear metals substituted Sandwich-type POMs{Na2（dpdo）（H2O）4}[{Cs（H2O）2}2{Na（H2O）2}2{Cu2As2W19O68（H2O）3}]·6H3O+·H2O （11）,and two Keggin-based polymers （dpdo）1.5{[Mn2（dpdo）4（H2O）6](GeMo12O40)（H2O）4}n（12）and {[Mn2（dpdo）4（H2O）6](GeW12O40)（H2O）3}n（13）. Magnetic properties of polymer10andthe luminescent properties of12and13in the solid state at room temperature have beeninvestigated. |
PDF Full Text Request