5-fold Twinned Nanowires and Single Twinned Right Bipyramids of Pd: Utilizing Small Organic Molecules To Tune the Etching Degree of O2/Halides
5-fold Twinned Nanowires and Single Twinned Right Bipyramids of Pd: Utilizing Small Organic Molecules To Tune the Etching Degree of O2/Halides
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DOI：
10.1021/cm4042204
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发表时间：
2014-03
影响因子：
8.6
通讯作者：
Na Lu;Wei Chen;G. Fang;Bili Chen;Keqin Yang;Yun Yang;Zhencai Wang;Shaoming Huang;Yadong Li
中科院分区：
文献类型：
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作者：
Na Lu;Wei Chen;G. Fang;Bili Chen;Keqin Yang;Yun Yang;Zhencai Wang;Shaoming Huang;Yadong Li
我们报道了在亲水性体系中，分别以乙腈和乙醇为辅助，以高产率合成了Pd的5重孪晶纳米线和单一孪晶右双锥。控制合成是基于这样一种想法，即可以通过不同强度的静电相互作用吸引卤素离子的有机小分子（SOM）可以很好地调节它们的活性，以调节O2/卤化物的蚀刻程度，从而保护孪晶Pd晶核。通过碘淀粉实验、核磁共振氢谱和理论计算，我们认为乙腈与卤离子之间形成纳米线的相对较强的相互作用是由于CH 3CN中吸电子CN基团诱导的三个C-Hδ+键的存在。在此基础上，我们成功地将自组织分子扩展到其他分子，包括丙酮，1，4-二氧六环和1，3，5-三氧六环，它们具有类似的功能。
We report that 5-fold twinned nanowires and single twinned right bipyramids of Pd with high yields can be selectively synthesized in a hydrophilic system with the assistance of acetonitrile and ethanol, respectively. The controlled synthesis is based on an idea that small organic molecules (SOMs) that can attract halide ions via electrostatic interactions of different strengths could well adjust their activity to tune the etching degree of O2/halides for protecting the twinned Pd crystal nucleus. We consider that relatively stronger interaction between acetonitrile and halide ions for the formation of nanowires is due to the existence of three C–Hδ+ bonds induced by the electron-withdrawing CN group of CH3CN, which is confirmed by an as-called iodine starch test, 1H nuclear magnetic resonance spectra, and theoretical calculations. On the basis of this finding, we then have successfully expanded SOMs to other molecules, including acetone, 1,4-dioxane, and 1,3,5-trioxane, which have a function similar to th...