Rational design of nanofibers and nanorings through complementary hydrogen-bonding interactions of functional pi systems.
Rational design of nanofibers and nanorings through complementary hydrogen-bonding interactions of functional pi systems.
复制标题
DOI：
10.1002/chem.201000839
复制
发表时间：
2010-08
期刊：
影响因子：
--
通讯作者：
S. Yagai;H. Aonuma;Y. Kikkawa;S. Kubota;T. Karatsu;Akihide Kitamura;S. Mahesh;A. Ajayaghosh
中科院分区：
文献类型：
--
作者：
S. Yagai;H. Aonuma;Y. Kikkawa;S. Kubota;T. Karatsu;Akihide Kitamura;S. Mahesh;A. Ajayaghosh
一个简单的协议，通过合理的自组装方法来创建纳米纤维和环。而三聚氰胺-低聚（对亚苯基亚乙烯基）共轭物1a自聚集形成不明确的纳米结构，共轭物1b，它拥有一个酰胺基团作为一个额外的相互作用的网站，自聚集形成一维纳米纤维，诱导凝胶化的溶剂。AFM和XRD研究表明，通过三聚氰胺-三聚氰胺氢键相互作用的二聚化只发生在1b。在与1/3当量的氰尿酸（CA）络合后，缀合物1a在微摩尔浓度下提供明确定义的环形纳米结构，其在亚毫摩尔浓度下打开以形成纤维组装体和在毫摩尔浓度范围内形成有机凝胶。显然，CA增强了1a的聚集能力是所得到的分散复合物1a（3）. CA的柱状组织的结果。与此相反，1b与CA的共聚集不提供明确的纳米结构，可能是由于互补的氢键相互作用的酰胺基团的干扰。
A simple protocol to create nanofibers and -rings through a rational self-assembly approach is described. Whereas the melamine-oligo(p-phenylenevinylene) conjugate 1a self-aggregates to form ill-defined nanostructures, conjugate 1b, which possesses an amide group as an additional interactive site, self-aggregates to form 1D nanofibers that induce gelation of the solvent. AFM and XRD studies have shown that dimerization through the melamine-melamine hydrogen-bonding interaction occurs only for 1b. Upon complexation with 1/3 equivalents of cyanuric acid (CA), conjugate 1a provides well-defined, ring-shaped nanostructures at micromolar concentrations, which open to form fibrous assemblies at submillimolar concentrations and organogels in the millimolar concentration range. Apparently, the enhanced aggregation ability of 1a by CA is a consequence of columnar organization of the resulting discotic complex 1a(3).CA. In contrast, coaggregation of 1b with CA does not provide well-defined nanostructures, probably due to the interference of complementary hydrogen-bonding interactions by the amide group.