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Syntheses,Crystal Structures,and Properties Metal Phosphonates With Two Ligands

Posted on:2016-07-10Degree:MasterType:Thesis
Country:ChinaCandidate:W Z LiFull Text:PDF
GTID:2321330470969222Subject:Inorganic Chemistry
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In this work,seven new metal phosphonate coordination polymers have been synthesized under hydrothermal conditions by using 4-carboxyphenylphosphonic acid(4-cppH3)and N,N’-piperazinebis(methylenephosphonic acid)as ligands.All compounds were structurally characterized by X-ray single-crystal diffraction,X-ray powder diffraction,infrared spectroscopy and thermogravimetric analysis.Moreover,the surface photovoltage properties of compounds 1-4 have also been studied.The chemical formulas are listed as follows:(1)[Cu(4-cppH)0.5(1,10-phen)(OH)]·2H2O(2)[Cu4.5(2,2–bipy)3(4-cpp)3]·2H2O(3)[Cu2(4-cpp)(2,2–bipy)(H2O)](4)[Cu(4-cppH)(2,2–bipy)(H2O)](5)[Cu2(4-cpp)(H2O)3](6)[La2(HO3PCH2NH(C2H42NHCH2PO3H)(C2O42(H2O)2]·4H2O(7)[Ce2(HO3PCH2NH(C2H42NHCH2PO3H)(C2O42(H2O)2]·4H2OBy using 4-carboxyphenylphosphonic acid(4-cppH3)as the phosphonate ligand and2,2’-bipy,1,10-phen as the second metal linker,a series of transition metal copper compounds1–5 are synthesized.X-ray diffraction analysis exhibits that compounds 1,2,4 and 5 are two-dimensional layer structure,compound 3 features a 3D supramolecular structure.Compounds 1 and 4 show a 2D supramolecular structure byπ–πstacking interactions.Compound 5 shows a 2D supramolecular structure under the action of hydrogen bonding interactions.X-ray diffraction analysis shows that compounds 6 and 7 feature a 3D framework structure.compounds 6 and 7 are synthesized by using N,N’–piperazinebis(methylenephosphonic acid)as ligands and oxalate as the second metal linker under hydrothermal conditions.Compounds 6 and 7 are isomorphic.Thermal stabilities experiments of compounds 1–5 illustate that compounds 1 and 3 have the stabilized framework structures from room temperature to 300°C.The SPS and FISPS of compounds 1,3 and 4 indicate that it exhibits surface photovoltage properties and show p-type semiconductor characteristic.
Keywords/Search Tags:Metal phosphonate, Crystal structure, Coordination polymers, Surface photovoltage property
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