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Synthesis And Properties Of The Novel Metal Borates

Posted on:2011-01-11Degree:MasterType:Thesis
Country:ChinaCandidate:S L WuFull Text:PDF
GTID:2121330338479334Subject:Physical chemistry
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Inorganic-organic hybrid materials have been an active area in materials chemistry, which contain advantages of inorganic and organic, have potential applications in mechanical, thermal, optical, electromagnetic science and biology. Borate materials have been a research field with rapid expansion in the past decades, mainly because of their rich structural chemistry and important practical applications as second harmonic generation optical materials. However, in comparison with inorganic borates, relatively less work has been carried out on the synthesis, crystal structure and application of inorganic-organic hybrid borates. Therefore,it is believed that exploring inorganic-organic hybrid borates is significant for searching for novel functional materials.In this thesis, four novel inorganic-organic hybrid borates have been synthesized under mild hydrothermal/solvothermal conditions or by evaporating solution as a synthetic medium. Research work have been done for Sb containing inorganic-organic hybrid borates, we have hydrothermally synthesized two sodium antimonate unexpectedly. Their crystal structure have been determined from single-crystal X-ray diffraction data and further characterized by FT-IR spectrum, XRD, and simultaneous DTA-TG.(1) Organic-acids containing inorganic-organic hybrid borates: two new inorganic-organic hybrid borates, [Al2(fum)(H3BO3)(OH)4]n·n(H3BO3)(1)and [Na2(fum)(H3BO3)(H2O)4]n·n(H3BO3)(2) have been synthesized by mild hydrothermally condition and evaporating solution. In compound (1), each Al atom coordinates to one oxygen atom from the fumarate anion, one oxygen atom from the boric acid and four oxygens from hydroxyl groups, forming a octahedron structure. Distorted AlO6 octahedra are each edge-shared with its neighbors to form [Al2(fum)(H3BO3)(OH)4]n infinite chain running along the a-axis direction. To the best of our knowledge, it is the frist 1D inorganic-organic hybrid borates with special connection. Althought synthesis methods are different, compound (1) and (2) exhibit similar coordination frameworks.(2) Amines containing inorganic-organic hybrid borates: two new inorganic-organic hybrid borates, [Ni(C4H13N3)2]·[B5O6(OH)4]2(3) and [Cu(C2H8N2)2(H3BO3)2]·1/2[Cu(C2H8N2)2(H2O)2]·1/2[Cu(C2H8N2)2]·[B4O5(OH)4]2(4) have been synthesized by two different methods. In compound (3), the anionic units, [B5O6(OH)4]-, are interlinked via hydrogen bonding to form a 3D supramolecular network containing large channels, in which the [Ni(C4H13N3)2]2+ cations are located. For compound (4), [B4O5(OH)4]2- anionic units connect with metallo-organiclly templates by hydrogen bonds alternately forming a 1D infinite chain, the chains join in their neighbors by hydrogen bonds forming 3D supramolecular structure.(3) Antimonate: further research work should be done for Pb, Bi and Sb containing inorganic-organic hybrid borates by hydrothermal/solvothermal methods. We obtained two novel sodium antimonate unexpectedly: Na4Sb8O14(5)和Na6(OH)3(H2O)10·Sb6(OH)21(6). They are 3D structures and further characterized by FT-IR.
Keywords/Search Tags:Borate, Hydrothermal synthesis, Inorganic-organic hybrid, Crystal structure
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