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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Building block approach to nanostructures: step-by-step assembly of large lanthanide-containing polytungstoarsenate aggregates
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Building block approach to nanostructures: step-by-step assembly of large lanthanide-containing polytungstoarsenate aggregates

机译：纳米结构的构建方法：逐步组装大型的含镧系元素的多钨砷酸盐聚集体

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摘要

Three large cerium-containing polytungstoarsenate aggregates have been synthesized via a step-by-step assembly process. Reaction of Na-9[AsW9O33] precursors, ceric sulfate and potassium citrate in an acidic aqueous solution at pH = 3 led to the isolation of a new dimeric sandwich-type compound K9Na7[{Ce2O(H2O)(5)}{WO(H2O)}{AsW9O33}(2)](2) center dot similar to 48H(2)O (1). The presence of the citrate anion prevents precipitation of simple lanthanide salts with polyoxometalates. The reaction of compound 1 with alpha-alanine at pH = 2 resulted in the formation of a new alanine-decorated cryptand compound K2Na10[Ce4As4W44O151(ala)(4)(OH)(2)(H2O)(10)] center dot similar to 40H(2)O (2). The reaction between compound 1 andMnCl(2) at pH = 5 yielded the other inorganic cryptate Mn0.5K5Na18[Ce4As4W41O149] center dot similar to 50H(2)O (3). All compounds are characterized by elemental analyses, TG analyses, IR, UV-Vis absorption spectra, X-ray photoelectron spectroscopy (XPS), single crystal X-ray diffraction and electrochemical analyses. The crystal data for these compounds: 1, triclinic, P (1) over bar, a = 12.314(3) angstrom, b = 17.953(4) angstrom, c = 22.355(5) angstrom, a = 90.18(3)degrees, beta = 101.97(3)degrees, gamma = 91.08( 3)degrees, Z = 1; 2, monoclinic, P2( 1)/ n, a = 23.4483(15) angstrom, b = 21.8764(13) angstrom, c = 23.6930(14) angstrom, beta = 111.0560 degrees, Z = 2; 3, triclinic, P (1) over bar a = 20.636( 4) angstrom, b = 23.000(4) angstrom, c = 25.039(4) angstrom, alpha = 81.991(3)degrees, beta = 73.333(3)degrees, gamma = 74.835( 3)degrees, Z = 2. Electrochemical analyses of compounds 1-3 suggest that tetravalent cerium ion can be stabilized by the polyanions with high negative charges.
机译：通过分步组装过程已经合成了三种大型的含铈多钨砷酸根聚集体。 Na-9 [AsW9O33]前体，硫酸铈和柠檬酸钾在pH = 3的酸性水溶液中反应导致分离出新的二聚体三明治型化合物K9Na7 [{Ce2O（H2O）（5）} {WO（ H2O）} {AsW9O33}（2）]（2）中心点类似于48H（2）O（1）。柠檬酸根阴离子的存在可防止简单的镧系元素盐与多金属氧酸盐沉淀。化合物1与α丙氨酸在pH = 2的反应导致形成新的丙氨酸修饰的隐窝化合物K2Na10 [Ce4As4W44O151（ala）（4）（OH）（2）（H2O）（10）]中心点类似至40H（2）O（2）。化合物1与MnCl（2）在pH = 5时的反应产生了另一个类似于50H（2）O（3）的无机盐酸盐Mn0.5K5Na18 [Ce4As4W41O149]中心点。所有化合物的特征在于元素分析，TG分析，IR，UV-Vis吸收光谱，X射线光电子能谱（XPS），单晶X射线衍射和电化学分析。这些化合物的晶体数据：1，三斜晶，P（1）（bar），a = 12.314（3）埃，b = 17.953（4）埃，c = 22.355（5）埃，a = 90.18（3）度， beta = 101.97（3）度，γ= 91.08（3）度，Z = 1; 2，单斜晶，P 2（1），a＝23.4483（15）埃，b ＝ 21.8764（13）埃，c ＝ 23.6930（14）埃，β＝ 111.0560度，Z ＝ 2; 3，三斜线，P（1）超过a = 20.636（4）埃，b = 23.000（4）埃，c = 25.039（4）埃，alpha = 81.991（3）度，beta = 73.333（3）度， γ= 74.835（3）度，Z =2。化合物1-3的电化学分析表明，四价铈离子可被带有高负电荷的聚阴离子稳定。

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