Synthesis And Characterization Of Inorganic-organic Hybrid Transition Metal Borates

In this thesis, six novel inorganic-organic hybrid borates and one novel inorganic borate havebeen synthesized under mild hydrothermal/solvothermal conditions. The crystal structures havebeen determined from single-crystal X-ray diffraction data and further characterized by X–raypowder diffraction, FT-IR spectrum, and simultaneous DTA-TG.（1） Inorganic-organic hybrid transition metal borates containing2-aminoethanol: two novelinorganic-organic hybrid transition metal polyborates, M{B6O7（OH）3[O（CH₂）2NH₂]₃}（M=Co（1）,Ni） have been synthesized under mild solvothermal conditions, and they are isomorphous.Compound1consists of an inorganic-organic hybrid {B₆O₇（OH）₃[O（CH₂）2NH₂]3}₂-anion and aCo2+cation. The Co²⁺cation is octahedrally coordinated by three N atoms from the organiccomponent and three O atoms covalently linking the B–O cluster and the organic component. The{B₆O₇（OH）3[O（CH₂）₂NH2]3}2-anion in compound1can be regarded as resulting from thedehydration reaction of three2-aminoethanol molecules with the three hydroxy groups in[B₆O₇（OH）₆]²-B–O cluster. Molecules are connected via hydrogen bonding to form a3Dsupramolecular network.（2） Inorganic-organic hybrid transition metal borates containing ethylene glycol: a noveltransition metal polyborate, Co2{[B_<sub>7（OH）₃]₂[O（CH₂）₂O]₃}·6H₂O （2） has been synthesizedunder mild solvothermal conditions. Compound2consists of an inorganic–organic hybrid{[B_<sub>7（OH）₃]₂[O（CH₂）₂O]₃}4-anion, two Co2+cations and six water molecules. The{[B_<sub>7（OH）₃]₂[O（CH₂）₂O]₃}4-anion can be regarded as resulting from the dehydration reaction ofthree ethylene glycol molecules with six hydroxy groups in two [B6O7（OH）6]2-anions. One of thetwo Co2+cations is sandwiched in the structure of {[B_<sub>7（OH）₃]₂[O（CH₂）₂O]₃}4-to form aCo{[B_<sub>7（OH）₃]₂[O（CH₂）₂O]₃}2-anion, the other one is octahedrally coordinated by six Oatoms from six water molecules. Molecules are connected via hydrogen bonding to form a3Dsupramolecular network.（3） Inorganic-organic hybrid transition metal borates containing tartaric acid: three newinorganic-organic hybrid transition metal borates, Mn5[（C₄H₂O₆）₂B]2·6H2O （3）, NaCo2[（C₄H₂O₆）₂B]·H₂O （4） and KCo2[（C₄H₂O₆）₂B]·3H₂O （5） have been synthesized under mildhydrothermal conditions. These three compounds all have the [（C₄H₂O₆）₂B]5-building block, the [（C₄H₂O₆）₂B]^5-building block can be regarded as resulting from the dehydration reactionof one boric acid molecule with two tartaric acid molecules. They are all3-dimensional structures.（4） Inorganic borates: a novel metal borate, Pb₉B₁₈O₃₆（PbB₂O₄,6）, has been synthesizedunder mild solvothermal conditions. Compound6is of3-dimensional open architecture, the open-framework structure of6have channels along a-axis, b-axis and c-axis.