| The inorganic-organic hybrid materials could keep original compositions of excellent properties, which has attracted great interest for their potential applications in electrics, luminescence, catalysis. In view of the way of combining and forming between inorganic materials and organic materials, we select the inorganic constituents of sulfuric acid and lanthanides and organic constituents (organic amine) acting as the template reagent or structure-directing reagent to gain inorganic-organic hybrid materials with different dimensional lanthanides sulfates. In this thesis, we choose hydrothermal and solvothermal conditions to isolate the products by changing the ratio of reactants, replacing of organic component, adjusting sequences of reactants, altering crystallization temperatures and pH conditions and have detailedly introduced six inorganic-organic hybrid materials with different dimensional lanthanides sulfates, all of the compounds have been characterized by single crystal X-ray diffraction, IR spectrum, X-ray powder diffraction, TG/DTA, elemental analyses and fluorescence analysis.1 Organic constituents act as template in compounds: selected ethylenediamine and dimethylamine as templates, [Tb2(H2O)(SO4)6][C2N2H4]1.5(1),(C2H8N)9[Eu5(SO4)12]·2H2O(2)and have been synthesized under solvothermal conditions. The results of single crystal X-ray diffraction analyses are that compound (1) possesses 2D layer structure and compound (2) possesses 3D channels structure, with two different structural 20-membered rings, the first 20-membered ring is surrounding by six 10-membered ring; the other rectangular one is separated by helical chains.2 Organic constituents act as structure-directing reagents in compounds, selected ethylenediamine, hydrazine sulfateas, tetramethylammonium hydroxide and dimethylamine as structure-directing agents, [Zn4(OH)12(SO4)2]·8H2O(3),[Sm2(SO4)4.5H2O]·4H2O(4),Eu2(H2O)4(SO4)3(5)å'ŒEr4(μ3-O)4(SO4)4(H2O)3(6) have been synthesized under hydrothermal and solvothermal conditions. The results of single crystal X-ray diffraction analyses are that compound (3) possesses dense 2D layer topological structure constructed by (45,62) cages; compound (4) exhibits a novel 2D layer structure constructed by Sm2 cluster core; compound (5) possesses 3D open framework structure; compound (6) exhibits a novel 3D structure constructed by Er4 cluster core.3 The excitation and emission luminescence of compound (5) was investigated at room temperature, the strongest emission band is at 616nm, which is attributed to 5D0â†'7F2 of Eu(â…¢). Strong luminescence of compound (5) is attributed to the fact that bridging SO4 groups link the Eu-O-S layers to form 3D framework which increases the rigidity of the Eu atoms effectively and reduces the loss of energy by thermal vibrations. |
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