Controllable growth of straight nanorods and nanowires in the Langmuir films of a bolaamphiphilic par derivative.
Controllable growth of straight nanorods and nanowires in the Langmuir films of a bolaamphiphilic par derivative.
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DOI：
10.1002/cphc.200500268
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发表时间：
2006-02
期刊：
影响因子：
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通讯作者：
P. Guo;Minghua Liu;H. Nakahara;K. Ushida
中科院分区：
文献类型：
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作者：
P. Guo;Minghua Liu;H. Nakahara;K. Ushida
合成了一种新型亲bola两亲性化合物1,10 -双[3'-羟基-4'-（2 " -吡啶偶氮）酚氧]癸烷[(PAR)2C10]，并研究了其在Langmuir单分子膜上的扩散膜及其与金属离子在空气/水界面的原位配位。发现（PAR）2C10可以在水面上扩散，Langmuir膜在压缩后由扁平构象转变为u形构象。在Langmuir单分子层中，（PAR）2C10与金属离子之间可以原位发生界面配位。根据亚相浓度的不同，观察到不同的配位模式。在较低浓度的亚相上形成了2:1（配体- par -金属离子）的配合物，而在较高浓度的盐的亚相上形成了1:1的配合物。有趣的是，从含有高浓度CuCl2的亚相转移的膜的AFM图像中可以观察到非常直的纳米线，延伸到几微米。然而，在含Cu(CH3COO)2的亚相下，纳米线呈扭曲状。这种线状结构的形成只有在亲bola两亲性PAR衍生物与Cu（II）离子结合时才观察到。其他金属离子或单链PAR衍生物没有表现出这种行为。提出了一种基于bolaamphi亲性（PAR）2C10与Cu（II）离子及反阴离子配合的纳米线生长机制。
A novel bolaamphiphilic compound, 1, 10-bis[3'-hydroxy-4'-(2''-pyridylazo)phenoloxy] decane [(PAR)2C10], was synthesized and its spreading film and in situ coordination with metal ions in the Langmuir monolayer at the air/water interface were investigated. It was found that (PAR)2C10 could be spread on the water surface, and the Langmuir film showed a phase transition from a flat conformation to a U-shaped conformation upon compression. Interfacial coordination between (PAR)2C10 and metal ions could occur in situ in the Langmuir monolayer. Depending on the concentration of the subphase, different coordination modes were observed. A 2:1 (ligand-PAR-to-metal-ion) complex was formed at a lower concentration of the subphase, while a 1:1 complex was obtained on the subphase with a higher concentration of the salt. Interestingly, very straight nanowires, extending to several micrometers, were observed in the AFM images of the films transferred from the subphase containing CuCl2 in higher concentrations. However, tortuous nanowires were observed under the subphase containing Cu(CH3COO)2. The formation of such kind of wire-like structures was only observed for the combination of the bolaamphiphilic PAR derivative with the Cu(II) ions. Other metal ions or the single-chain PAR derivative did not show this behavior. A possible growth mechanism of the nanowires was proposed based on the coordination of the bolaamphiphilic (PAR)2C10 with the Cu(II) ions as well as with the counteranions.