Self-assembled pyrazinacene nanotubes.
Self-assembled pyrazinacene nanotubes.
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DOI：
10.1039/c0cp02025g
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发表时间：
2011-03
期刊：
影响因子：
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通讯作者：
G. Richards;Jonathan P. Hill;J. Labuta;Y. Wakayama;Misaho Akada;K. Ariga
中科院分区：
文献类型：
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作者：
G. Richards;Jonathan P. Hill;J. Labuta;Y. Wakayama;Misaho Akada;K. Ariga
采用分级自组装方法制备了并五苯衍生物6，13-双（1-正十二烷基）-[a，c，l，n]-四苯并-5，6，7，12，13，14-六氮并五苯纳米管。低聚氮杂并苯1-3，由于其线性稠合的吡嗪杂环的结构而被称为吡嗪并苯，也可以被认为是通过还原的吡嗪环稠合的两个氮杂三亚苯基。将6，13-双（1-正十二烷基）-[a，c，l，n]-四苯并-5，6，7，12，13，14-六氮杂并五苯溶解在接近沸腾的甲苯中，然后在室温下静置溶液，产生自组装的（sa）吡嗪并苯（Pa）纳米管（NT's），或sa-PaNT。吡嗪并苯的初始聚集产生130 nm宽的二维带，然后将该带螺旋扭曲成直径为150-200 nm的中空圆柱形式，其长度可以超过10 μm，从而形成自组装PaNTs。利用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、粉末X射线衍射（XRD）和电子吸收光谱（UV/维斯）对纳米带和纳米管结构的形貌进行了研究。后者表明，管可能是由发色团J-聚集。此外，管的高分辨率TEM显示它们可以由多个带组成，而粉末X射线衍射显示了组成管的带的片状结构。
Nanotubes of a pentacene derivative, 6,13-bis(1-n-dodecyl)-[a,c,l,n]-tetrabenzo-5,6,7,12,13,14-hexaazapentacene, have been prepared by a hierarchical self-assembly mechanism. The oligoazaacenes 1-3, referred to as pyrazinacenes due to their structures of linearly fused pyrazine heterocycles, can also be considered as two azatriphenylenes fused through a reduced pyrazine ring. Dissolution of 6,13-bis(1-n-dodecyl)-[a,c,l,n]-tetrabenzo-5,6,7,12,13,14-hexaaza pentacene in nearly boiling toluene followed by standing of the solution at room temperature yields self-assembled (sa) pyrazinacene (Pa) nanotubes (NT's), or sa-PaNTs. Self-assembled-PaNTs are formed after initial aggregation of the pyrazinacene giving a 130-nm-wide 2-dimensional tape followed by helical twisting of this tape into a hollow cylindrical form of 150-200 nm diameter which can exceed 10 μm in length. The morphologies of the tape and nanotube structures were investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), powder X-ray diffraction (XRD) and electron absorption spectroscopy (UV/Vis). The latter indicates that the tubes may be formed by chromophore J-aggregation. Also, high resolution TEM of the tubes reveals that they can be composed of several tapes while powder X-ray diffraction revealed the lamellar structure of the tapes composing the tubes.