β-Cyclodextrin-Capped Polyrotaxanes: One-Pot Facile Synthesis via Click Chemistry and Use as Templates for Platinum Nanowires
β-Cyclodextrin-Capped Polyrotaxanes: One-Pot Facile Synthesis via Click Chemistry and Use as Templates for Platinum Nanowires
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DOI：
10.1021/ma902255v
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发表时间：
2010-03-09
期刊：
影响因子：
5.5
通讯作者：
Gao, Chao
中科院分区：
文献类型：
--
作者：
Wu, Jiayan;He, Hongkun;Gao, Chao
在室温下，通过点击化学反应，在水溶液中采用一锅法制备了α-环糊精（α-CD）与β-环糊精（β-CD）封端的聚乙二醇（PEG）链连接的聚轮烷（PR），产率高达320 mg/100 mg PEG轴。末端β-CD空腔可以被酚酞识别，并通过与二金刚烷基封端的PEG形成主客体包合复合物，用于形成具有交替的棒和螺旋片段的超分子嵌段共聚物。制备的PR可以进一步作为一种新的模板，用于原位沉积铂（Pt）纳米粒子（NPs）制备金属纳米线。TEM和SEM观察表明，所制备的纳米线为多晶纳米线，长度为50-200 nm，直径约为100 nm。12 nm的Pt纳米粒子是由直径约为10 nm的Pt纳米粒子组成。2.5 nm.通过对对硝基苯酚的催化还原反应，证实了Pt纳米线的催化活性。迷人的β-CD封端的PR在各种领域都很有前途，如超分子化学和生物纳米技术，由于其容易和可销售的可用性和生物相容性。
Polyrotaxanes (PRs), in which alpha-cyclodextrins (alpha-CDs) were threaded onto poly(ethylene Glycol) (PEG) chains capped with beta-cyclodextrins (beta-CDs), were prepared by click chemistry via a one-pot strategy in water at room temperature with high yield, tip to 320 mg/100 mg PEG axis. The terminal beta-CD cavity could be recognized by phenolphthalein and utilized to form a supramolecular block copolymer with alternate rod and coil segments via the formation of a host-guest inclusion complex with diadamantyl-terminated PEG. The prepared PR could further work as a novel template for the in situ deposition of platinum (Pt) nanoparticles (NPs) to fabricate metallic nanowires. TEM and SEM observations showed that the resulting polycrystalline nanowires with length of 50-200 nm and diameter of ca. 12 nm were composed of close-packed uniform Pt Nil's with diameter of ca. 2.5 nm. The catalytic activity of the Pt nanowires was demonstrated by the reduction of 4-nitrophenol. The fascinating beta-CD-capped PR is promising in a wide variety of fields such as supramolecular chemistry and bionanotechnology due to its facile and salable availability and biocompatibility.