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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >New cyclotetrasiloxanes bearing sila-alkyl substituted side chains and their applications as templates for gold nanowires
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New cyclotetrasiloxanes bearing sila-alkyl substituted side chains and their applications as templates for gold nanowires

机译:带有硅烷基取代侧链的新型环四硅氧烷及其作为金纳米线模板的应用

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摘要

New sila-alkyl substituted cyclotetrasiloxanes, [RMe_2SiCH_2CH_2(Me)SiO]_4 [R = Ph(1), 2-thienyl(2), 2-furyl(3)] have been synthesized by a hydrosilylation reaction between 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane, (D_4~(Vi)) and dimethylphenylsilane/dimethyl-2-thienylsilane/dimethyl-2- furylsilane in the presence of Karstedt's catalyst. X-ray crystallographic studies of 1 and 2 reveal all-trans conformation of the methyl groups bonded to puckered siloxane core and formation of 3D supramolecular assemblies by virtue of intermolecular C-H?π interactions. These siloxanes act as potential templates for expeditious one pot synthesis of gold nanowires of varying aspect ratios which are obtained by reduction of HAuCl_4·3H 2O with triethylsilane (CHCl_3, RT). On the other hand, the use of linear polysiloxane, [2-ThMe_2SiCH_2CH_2(Me)SiO]_n (4) in lieu of the cyclosiloxane 2 affords predominant formation of polydispersed AuNPs along with a few extended structures. These results suggest that conformational confinement of the appended groups on the cyclosiloxanes, 1-3 plays an important role to impart morphological control of the gold nanowire assemblies.
机译:通过2,4,6之间的氢硅烷化反应合成了新的硅烷基取代的环四硅氧烷[RMe_2SiCH_2CH_2(Me)SiO] _4 [R = Ph(1),2-噻吩基(2),2-呋喃基(3)]在Karstedt催化剂的存在下,1,8-四甲基-2,4,6,8-四乙烯基环四硅氧烷(D_(4_(Vi))和二甲基苯基硅烷/二甲基-2-噻吩基硅烷/二甲基-2-呋喃基硅烷。 X和1的X射线晶体学研究揭示了键合到褶皱的硅氧烷核上的甲基的全反式构象,以及借助分子间C-H2π相互作用形成3D超分子组装体。这些硅氧烷充当潜在的模板,用于快速一锅合成纵横比不同的金纳米线,这是通过用三乙基硅烷(CHCl_3,RT)还原HAuCl_4·3H 2O来获得的。另一方面,使用线性聚硅氧烷[2-ThMe_2SiCH_2CH_2(Me)SiO] _n(4)代替环硅氧烷2可以使主要形成多分散的AuNP以及一些扩展结构。这些结果表明,环硅氧烷1-3上的附加基团的构象限制在赋予金纳米线组件形态控制方面起重要作用。

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