Synthesis, Characterization And Properties Of Several Polyoxomolybdates

In this paper,based on "Bottom up" approach,several polyoxomolybdates are synthesized with simple compounds through molecular design and self-assembly.Meanwhile,the structures of mentioned compounds are analyzed and the properties are researched. Here are some innovate achievemenste as listed below.1.We have synthesised an Anderson type polyoxomolybdate, Al(H₂O)₆[Al(OH)₆Mo₆O₁₈]·10H₂O,in which the element of both the counter cation and the heteroatom of the polyanions are the same.That is Aluminum.2D water sheet are observed due to this rare "one kind atom,double kind role".To begin with,both cyclic water hexamers in boat and chair conformations are littered around Al³⁺.What's more,the counter cation Al³⁺ is coordinated by six water molecules producing a novel 1D water chain.Last but not least,the water chains further on join together through a parallelogram composed of four water molecules to yield a unique 2D water sheet.2.A novel lanthanide polyoxomolybdate, [NH₄]₁₄[Gd₄(MoO)₄(H₂O)₁₆(Mo₇O₂₄)₄]·29H₂O has been synthesized by reaction of GdCl₃·6H₂O with the hepta-molybdate antion(Mo₇O₂₄)^6- in HAc-NH₄Ac buffer solution(pH=4.46).The crystal of this compound can be observed after 3h,which tempted us to research the crystallization rate of it.The results indicate that low temperature and little stir can promote the crystallization rate.3.A Keggin type polyoxomolybdate,[C₁₀H₁₀N₃]₃·[PMo₁₂O₄₀](1) containing double zig-zag chains has been hydrothermally synthesized. 3D network are formed owing to the hydrogen bonds between Keggin type polyanions and 2,2'-dipyridylamine.What's more,some organic ligand,2,2'-dipyridylamine,produce mutual parallel double zig-zag chain owing toÏ€-Ï€interactions.The electrochemical behavior of 1-CPE has been studied in detail.The results indicate that 1-CPE has a good electrochemical activity toward KClO₃,which can be ascribed to the interactions existed between Keggin type polyanions and 2, 2'-dipyridylamine.4.In this paper,we used Na₈K₁₆(VO)(H₂O)₅[K₁₀(?){(Mo)Mo₅O₂₁(H₂O)₃(SO₄)}₁₂(VO)₃₀(H₂O)₂₀]·1 50H₂O(1) as raw materials.At the same time,DODA serves as the modifier to enclose the polyoxomolybdate clusters.Experiment results indicated that novel organic-inorganic hybrid material,SEC-1,is not fully dissolve in CH₃Cl.Conversely,good-sized SEC-1 can be littered in water phase when the concentration of DODA falls in a field.Now, SEC-1 cannot be traditionally regarded as solute.Accurately speaking, SEC-1 serving as colloid littered in water phase.