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合成了一个系列的稀土含氮大环配合物[Ln(tmtaa)(Htmtaa)·CH2Cl2
(Ln =Sm, Tb, Er and Yb)],并通过红外光谱、质谱、分子吸收光谱和DSC对配合物进行了表征。配体tmtaa 和 Htmtaa中的八个氮原子与稀土离子配位,形成了一个夹心结构的配合物。X-射线光电子能谱研究结果表明tmtaa或Htmtaa中的四个氮原子具有相同的化学环境。因而,Htmtaa中的酸式氢不是直接与Htmtaa中任何一个氮原子结合,而是与四个氮原子共享。配合物的磁性测定结果与理论值完全一致。 相似文献
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A series of Ln(tmtaa)(Htmtaa)·CH_2Cl_2(Ln=Sm,Tb,Er and Yb)complexes were prepared and characterized byinfrared spectra,mass spectra and molecular electronic spectroscopy as well as DSC measurement.A sandwichstructure containing all the eight nitrogen atoms of tmtaa and Htmtaa was proposed for these complexes.X-rayphotoelectron spectra(XPS)of these complexes revealed that four nitrogen atoms of both tmtaa and Htmtaa werechemically equivalent to each other,respectively.The acidic hydrogen of Htmtaa did not bind specifically to any ni-trogen atom of Htmtaa,but was shared by all the four nitrogen atoms.The magnetic properties of these complexeswere found to be in good agreement with their theoretical values. 相似文献
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应用氧化法水热合成了Na型层状氧化锰[BirMO(Na)], 通过离子交换反应在0.1 mol/L HCl溶液中Na型层状氧化锰转化成H型层状氧化锰[BirMO(H)]. BirMO(H)在四甲基氢氧化铵[(CH3)4NOH]溶液中搅拌处理7 d后, 剥离生成了MnO2纳米层胶体分散液. 剥离的MnO2纳米层胶体分散液在pH=4.0~11.0的精氨酸溶液中搅拌2 d, 得到了层间距为1.49 nm的精氨酸插层氧化锰纳米结构材料. 通过XRD, DSC-TGA, SEM, IR及元素分析对合成试样进行了分析表征. 结果表明精氨酸在氧化锰层间的插入量及插入形式与重组溶液的pH值密切相关, 其最大插入量为1.80 mmol/g. 相似文献
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层间距为1.44 nm层状氢氧化苯甲酸锌剥离重组行为研究 总被引:1,自引:0,他引:1
层间距为1.44 nm层状氢氧化苯甲酸锌在乙醇、正丙醇、正丁醇介质中可剥离成其基本组成单元纳米层. 用TG-DTA、XRD、SEM、TEM和元素分析等手段研究了剥离的纳米层重组得到样品的结构特征、形貌和化学组成. 结果表明: 水热合成样品和剥离的纳米层重组样品具有相同的层状结构, 它们的化学组成分别为Zn(OH)1.12(C6H5COO)0.88和Zn(OH)1.1(C6H5COO)0.9. 水热合成的纤维状粒子剥离重组后改变成为像纳米带和纳米花粒子形貌. 相似文献
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The organic-inorganic layered compound zinc hydroxide-benzoic acid with basal spacing of 1.92 nm was synthesized hydrothermally using amorphous Zn(OH)2 and benzoic acid at the reaction temperature of 90~130 ℃, the molar ratio of C6H5COOH/Zn(Containing 6 mmol of Zn) of 0.4~0.6, 20 mL H2O and the reaction time of 6 h. The character, structure, particle morphology and chemical composition of the layered compound were characterized by means of XRD, TG-DTA, SEM, TEM and elemental analysis. The results indicate that the layered compound is of plate-like morphology and that with the temperature raising of hydrothermal synthesis, the particle of plate-like piece becomes smaller. The chemical formula of the layered compound could be written as Zn(OH)2-y·(C6H5COO)y·0.3H2O, 0.36≤y≤0.54. 相似文献
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