Synthesis And Structure Of Supermolecular Compound Based On Phosphmolybdate

Phosphomolybdates, as one of the most well-known members in polyoxometalates family, have attracted great attention because of the structural versatility and potential applications. In this thesis, three new supramolecular phosphomolybdates were synthesised under hydrothermal conditions by the reaction of phosphorous acid, sodium molybdate, imidazole and transition metal salts. These three compounds were characterized by single crystal X-ray diffraction, elemental analysis, XRD, IR and TG-DTA. The electrochemistry property of compound 3 was also studied.Compounds 1 and 2 are supramolecular compounds based on different Keggin isomer: [Co(C3N2H4)6] (C3N2H4)3[β-PMo12O40]·4H2O 1 [Zn(C3N2H4)4] (C3N2H4)[α-PMo12O40]·2H2O 2Compound 1 is composed of a two-electron reducedβ-Keggin polyanions, imidazole cobalt coordinated complex and protonated imidazole molecule. [β-PMo12O40]5- and cations are linked by hydrogen bonds to form a 3D supermolecular structure. The magnetic property of compound 1 was also studied in the range from 2 to 300K. The polyanion of compound 2 is an isomer ofα-Keggin. Furemore, a 3D supermolecular framework structure is formed via hyrogen bonds interactions in compound 2.Compound 3 is a supramolecular compound on the basis of highly reduced [(HPO4)3(PO4)MoV6O15]9- cluster: (C3N2H4)6(H3O)10Na(H2O)2{Na[(HPO4)3(PO4)MoV6O15]2} 3Two adjacent [(HPO4)3(PO4)MoV6O15]9- clusters are connected by a sodion to form a sandwich structure. Compound 3 is also a 3D supermolecular framework structure. Compound 3 shows good electrocatalytic activity toward the reduction for nitrite.