Synthesis, Structure, Characterization Based On Antimony Molybdate Keggin-type Cap Metal-organic Framework Compounds

The POMs,development has been two hundred years of history, because of its unique structureand unicture properties, Therefore has potential applications in many areas materials, catalysis, drugs,etc, so much attention. Organometallic complexes modified multi-metal molybdates have shownbroad, far-reaching applications. So far, Reported the Mo-Sb cap Keggin Structure molybdate veryrare. Therefore Miscellaneous Multi molybdate, Especially antimony cap modified heteropolymolybdate more of its major significance.Synthesis is the source and driving force of POMs. Hydrothemal method is the orginal methodof synthetic chemistry and the most effective method. Hydrothermal method is the use of an aqueoussolution of high temperature and pressure so that insoluble or poorly soluble substance in dissolvedunder atmospheric conditions, Or the reaction product of the substance is dissolved, By controllingthe temperature difference between the solution in the autoclave so as to form a supersaturated stateconvection precipitate crystal growth method. Hydrothermal method has its unique advantages,Synthetic crystal fewer internal defects, high crystal purity, dispersion, and low cost, relatively longcrystal structured, But there are drawbacks hydrothermal its indelible, The growth of such equipmentand process requirements, poor security, can not be directly observed crystals, and entering into theimpurities and difficult to duplicate.This article is by hydrothermal synthesis, selection of ligands having different properties(terephthalic acid, dimethyl imidazole, phthalic acid,1,2-propanediamine, imidazole,2,2-bipyridine,4,4-bipyridine, ethylenediamine and so on) and transition metal ions(chromium, copper,nickel, zinc, manganese acetate) modifications to multi-metal molybdates, Synthetic start from zerodimension POMs, then continue to explore the synthesis and experimental conditions necessaryrequirements, and then hope that the synthesis of one-dimensional, two-dimensional,three-dimensional or multi-dimensional multi-metal molybdate,then tested and characterized isstructure, In order to understand its characteristics and significance in real life and production.In this paper, six kinds of compounds can be synthesized, the formula is following:(1) H(C4H7N2)2(GeIVMoV5MoVI7SbIII2O40)·2H2O(2) H2(C4H7N2)[GeIVMoV5MoVI7SbIII2O40]·1.5H2O(3)(C5H6N)[Zn(C5H5N)3][SiIVMoV5MoVI7SbIII2O40]·2H2O(4)(C5H5N)2H3[SiIVMoV5MoVI7SbIII2O40]·2H2O(5){CuI[C4N2H6]2}2[P MoV5MoVI7SbIII2O40]·2H2O(6) H2[C5NH6]2[P MoV5MoVI7SbIII2O40]·H2OThese types of compounds are characterized by single crystal X-ray diffraction, elemental analysis, infrared spectroscopy, thermal analysis were characterized to determine the molecularstructure,while their properties are also discussed.