Polyoxometalate(W/Mo) Compounds Connected Via Lanthanide Cations Or Transitional Metal Cations With Three Dimensional Framework: Synthesis, Structures, And Magnetic

The design of polyoxometalate clusters has attracted long-lasting research interest not only because of their appealing structural and topological novelty but also due to their unusual optical, electronic, magnetic, and catalytic properties, as well as their potential medical application due to their antiviral and inhibition of angiogenesis. Enighting novel compounds have been synthesized by the hydrothermal or conventional solution synthetic method in this thesis, which have been further characterized by X-ray single crystal diffraction and spectroscopes. Their single crystal molecular structures, as well as the magnetic properties for some compounds have also been systematically investigated. The major work of this thesis are outlined as following:1. In the first charter, the recent development of the iso- or heterometallates and the hybrid materials is reviewed. Some representative structures and applicable properties are also summarized.2. In the second charter, we describe the synthesis of a series of novel polyoxo(mixed-metalate) (W/Mo) compounds connected via trivalent lanthanide cations, namely H₂{K(H₂O)₂Ln(H₂O)₅[H₂M₁₂O₄₂]}·nH₂O (Ln = La, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb. Lu; M = W or W/Mo) (â… -â…©), with three dimensional framework. Their single crystal molecular structures, as well as the magnetic properties for compoundsâ…¡andâ…£-â…ª, have also been systematically investigated.3. In the third one, we describe the synthesis of three novel tungstate-molybdenum polyoxometalate compounds, namely H_2.5K₂[Mn_1.5W_5.65Mo_1.35O₂₄(H₂O)₄]Cl_1.5·6(H₂O) (â…ª). H₅K₂Na[Mn₂(H₂O)₆(H₂W_9.52Mo_2.48O₄₂)]Cl₂·20(H₂O) (â…«), and Na₂[Mn₄(H₂O)₁₄(H₂W₁₂O₄₀)]·16H₂0 (â…©â…¢). Single crystal X-ray diffraction analysis results reveal their three-dimensional structural networks connected via divalent manganese cations with the help of potassium cations. Their magnetic characteristics were also systematically investigated.4. In the final part, five novel polyoxomolybdate compounds linked by divalent transitional metal cations coordinated with 3-(2-Pyridyl)pyrazole ligand, [H₂(ML₂)Mo₃O₁₀]_n (M = Mn (â…©â…£), Fe (â…©â…¤), Ni (â…©â…¦)), (HL){H₄[Co(L)₂]₂Mo₂O₈]}(H₂O)₃ (â…©â…¥), H₄[Zn₂(L)₄]₂Mo₈O+(26)] (â…©â…§) (HL = 3-(2-Pyridyl)pyrazole) were designed and synthesized by the hydrothermal syntheses in the mixed ethanol/water solution. X-ray diffraction analyses reveal that compoundsâ…©â…£,â…©â…¤andâ…©â…¦consists of one-dimensional wave-like chains built up from the asymmetric mixed-metalate building blocks of [H₂(ML₂)Mo₃O₁₀]. Compoundâ…©â…¥is bimetallic tetranuclear cluster constructed from corner-sharing {MoO₄} in which two Cu(â…¡) ions are further coordinated with four N atoms from two L" ligands and two bridging oxygen atoms exhibting distorted octahedron. Whereas, compoundâ…©â…§is composed of two seperately parts with the dinuclear Cu₂(L)₄ andε-[H₄Mo₈O₂₆] unit.