| POMs have important scientific significance and application value in the field of environmental protection,green chemistry and sustainable development.POMs have exhibited tremendous advantages,such as stable structure,controllability,low toxicity,environmental friendliness,etc in the reaction of C-H bond activation,C-C and C-N bond construction,CO2 catalytic conversion.Therefore,synthesis and catalysis of polyoxometalates has become the focus of this thesis.The work is as follows:1.Four transition-metal modified polyoxometalates,[Ag3L21（DMSO）2][PW12O40]·4D MSO（1）,[（Ag2L21）2][SiW12O40]·10DMSO·2H2O（2）,[（CuCl2）2L1（DMSO）2]·2DMSO（3）,[(CuC14H8N3)2][PW12O40]·4H2O（4）,have been synthesized and thoroughly characterize d by SCXRD,PXRD,FT-IR and TGA.They have been applyed to the catalytic Man nich reaction.And compound 1 as heterogeneous catalysts show high catalytic activity under at room temperature conditions（conversion rate 85-99%,selectivity 99%）.The catalyst is stable and reused after three cycles without losing their activity.2.A series of new transition-metal modified Polyoxovanadates,[Zn（H2O）5]2[V10O28]·[（CH3）4N]2·5H2O（5）,[Mn（H2O）5]2[V10O28]·[（CH3）4N]2·4H2O（6）,[Co（H2O）5]2[V10O28]·[（CH3）4N]2·6H2O（7）,[Ni（H2O）5]2[V10O28]·[（CH3）4N]2·6H2O（8）,[Mn（H2O）6]2[V10O28]·[（CH3）4N]2·2H2O（9）,have been synthesized and thoroughly characterized by SCXRD,PXRD,FT-IR and TGA.And the catalytic conversion of CO2 was investigated.It is worth noting that Zn-POVs as a heterogeneous catalysts exhibit extraordinary efficiency in cycloaddition（conversion:75-99.0%,selectivity:up to 99.0%）.The catalyst is stable and reused after three cycles without losing their activity.3.Five new Pd-Im-POVs compounds,[Pd（N-eIm）4]2[PMo11VO40]·DMSO（10）,[Pd（N-eIm）4]2[HPMo10V2O40]·2DMSO（11）,[Pd（N-pIm）4]2[HPMo10V2O40]（12）,[Pd（N-mIm）4]2[H2PMo9V3O40]·4DMSO（13）,[Pd（N-ipIm）4]2[H2PMo9V3O40]·2DMSO（14）,have been synthesized and thoroughly characterized by SCXRD,PXRD,IR,TGA and so on.And compound 13 showed good tolerance in the Suzuki coupling reaction without the protection of N2,and these catalysts exhibit extraordinary efficiency in Suzuki coupling（conversion up to 99.0%,selectivity up to 99.0%）.And fluorescent properties of products were preliminary studied. |
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