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Functionalization of individual ultra-short single-walled carbon nanotubes

机译:单个超短单壁碳纳米管的功能化

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We report the functionalization of individual ultra-short (20-80 nm lengths) single-walled carbon nanotubes (US-tubes) via in situ Bingel cyclopropanation. Upon chemical reduction (K deg/THF) of bundled US-tubes, the bundling forces are electrostatically overcome to yield single, negatively charged US-tubes in solution. These single US-tubes can then be functionalized with malonic acid bis-(3-fe/t-butoxycarbonylaminopropyl) ester using Bingel chemistry (CBr_4/DBU) to yield 4-5 adducts nm~(-1), as determined by x-ray photoelectron spectroscopy (XPS). The derivatized US-tubes remain as individuals after functionalization and charge quenching. Thermogravimetric analysis (TGA) and solid-state NMR spectroscopy confirmed covalent attachment of the adducts and indicated tight wrapping of the adduct arms about the US-tubes. The resulting debundled and derivatized US-tubes serve as a prototype single-molecule-like 'capsule' for the containment and delivery of medically-useful payloads.
机译:我们通过原位Bingel环丙烷化报告单个超短(20-80 nm长度)单壁碳纳米管(美国管)的功能化。捆扎好的US管经过化学还原(K deg / THF)后,静电克服了捆绑力,从而在溶液中产生了一个带负电荷的US管。然后可以使用Bingel化学方法(CBr_4 / DBU)用丙二酸双-(3-fe /叔丁氧基羰基氨基丙基)酯对这些单个的US管进行功能化,生成4-5个加合物nm〜(-1),由x-确定。射线光电子能谱(XPS)。衍生化的US管在功能化和电荷淬灭后仍保留为个体。热重分析(TGA)和固态NMR光谱证实了加合物的共价结合,并表明加合物臂紧密包裹在US管上。所得的经过捆绑和衍生化的US管用作原型单分子“胶囊”,用于容纳和输送医疗用有效载荷。

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