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[求助]
请教Au25 Cluster 合成 [Au25(SC8H17)18]−
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请教关于Au25 Cluster 的合成，我重复Yuichi Negishi的papers。但是合成不出小的纳米粒子，UV-VIS没有450 640的峰。 乙腈离心后，clusters是溶于乙腈吗？丙酮萃取具体有什么步骤吗？ First, 20 mL of a toluene solution of (C8H17)4NBr (30 mM, 0.6 mmol) was added to 1.4 mL of an aqueous solution of HAuCl4 (0.14 M, 0.2 mmol). After vigorous stirring at room temperature for 30 min, 2 mL of an aqueous solution of NaBH4 (1 M, 2 mmol) was rapidly added to the solution. After 1 to 2 s, 3 mL of a toluene solution containing (C8H17Se)2 (1.5 mmol) was rapidly added to this solution. The solution’s color immediately changed from orange to dark red. The solution was stirred for 1 h. The organic phase was subsequently washed thoroughly with water and dried in an evaporator. The product was centrifuged at 3500 rpm with acetonitrile to remove byproducts such as (C8H17Se)2 and (C8H17)4NBr. The title compound was extracted from the dried product with a yield of 67% using acetone. 打扰，谢谢啦。 ![请教Au25 Cluster 合成 [Au25(SC8H17)18]−](https://muchongimg.xmcimg.com/data/bcs/2014/1211/w242h1853330_1418274034_104.png#opennewwindow) Screen Shot 2014-12-10 at 11.12.48 PM.png |
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