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Three ring-shaped Zr(iv)-substituted silicotungstates: syntheses, structures and their properties.
Nanoscale ( IF 5.8 ) Pub Date : 2020-08-05 , DOI: 10.1039/d0nr02945a
Zhong Zhang 1 , Yue-Lin Wang , Yan Liu , Sheng-Li Huang , Guo-Yu Yang
Affiliation  

Three Zr(IV)-substituted polyoxometalate nanoclusters, H16(H2dap)4[{Zr2(OH)2(α-SiW10O38)}2{Zr2(OH)2(β-SiW10O38)}2]·8H2O (1, dap = 1,3-diaminopropane), H17Na9[(Zr2(OH)2)2(Zr2BO(OH)4)2(β-SiW10O38)4]·50H2O (2) and H20Na8[(Zr2BO(OH)4)2(Zr2B2O2(OH)5)2(β-SiW10O38)4]·40H2O (3), were made by a hydrothermal reaction of trivacant [A-α-SiW9O34]10−, Zr4+ ions, and H3BO3 under different alkaline conditions. Single-crystal X-ray structure analysis revealed that they are ring-shaped polyoxotungstate aggregates built by Zr2(OH)2 ({Zr2}) clusters and two types of dilacunary α-/β-SiW10O38 ({α-/β-SiW10}) fragments for 1, {Zr2}, {β-SiW10}, and Zr2BO(OH)4 ({Zr2B}) clusters for 2, and {β-SiW10}, {Zr2B}, and Zr2B2O2(OH)5 ({Zr2B2}) clusters for 3, respectively, showing that the Zr–B–O clusters, {Zr2B} and {Zr2B2}, have been introduced to the lacunary sites of polyoxometalates for the first time. The electrochemistry and electrocatalytic properties of 2 were studied, and it exhibited effective catalytic activities for the reduction of H2O2, NO2, and BrO3. Moreover, the catalysis of 2 for the oxidation reactions of various thioethers was investigated, and it was found that 2 possessed high conversion and remarkable selectivity.

中文翻译:

三个环状Zr(iv)取代的硅钨酸盐:合成,结构及其性质。

三个锆(IV) -取代的多金属氧酸盐的纳米团簇,H 16(H 2 DAP)4 [{的Zr 2(OH)2(α-硅钨酸10 ö 38)} 2 {的Zr 2(OH)2(β-硅钨酸10 ö 38)} 2 ]·8H 2 O(1,DAP = 1,3-二氨基丙烷),H 17的Na 9 [(锆2(OH)22(锆2 BO(OH)42(β-硅钨酸10 ö38 4 ]·50H 2 O( 2)和H 20的Na 8 [(锆2 BO(OH) 4 2(锆22 ö 2(OH) 5 2(β-硅钨酸10 ö 38 4 ] ·40H 2(O 3),是由trivacant的水热反应制得的[A-α-硅钨酸9 ö 34 ] 10-,锆4+离子,和H 3 BO 3在不同的碱性条件下。单晶X-射线结构分析显示,它们是由锆内置环形polyoxotungstate聚集体2(OH)2({锆2 })簇和两种类型的dilacunaryα-/β-硅钨酸的10 ö 38({α- /β-硅钨酸10 })片段为1,{的Zr 2 },{β-硅钨酸10 },和Zr 2 BO(OH)4 - ({的Zr 2 B})簇为2,和{β-硅钨酸10 }, {Zr 2 B}和Zr 2 B 2 O 2(OH)5({Zr22 })为群集3,分别示出了Zr的-B-O群集,{的Zr 2 B}和{的Zr 22 },已被引入到多金属氧酸盐的首次缺位位点。的电化学和电催化性能2进行了研究,并且它显示出有效的催化活性为H的还原2 Ò 2,NO 2 - ,和的BrO 3 - 。此外,研究了2对各种硫醚的氧化反应的催化作用,发现2 具有高转化率和出色的选择性。
更新日期:2020-09-18
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