Synthesis of n-Type Perylene Bisimide Derivatives and Their Orthogonal Self-Assembly with p-Type Oligo(<i>p</i>-phenylene vinylene)s
作者:Jeroen van Herrikhuyzen、Asha Syamakumari、Albertus P. H. J. Schenning、E. W. Meijer
DOI:10.1021/ja048819q
日期:2004.8.1
Four different (chiral) electron-deficient (n-type) perylenebisimides containing aliphatic, aromatic, or ethyleneoxide side chaines have been synthesized and fully characterized. All of them form supramolecular stacks in apolar methylcyclohexane (MCH) solution as demonstrated by concentration- and temperature-dependent absorption, circular dichroism, and fluorescence studies. One derivative was investigated
四种不同的(手性)缺电子(n 型)苝双酰亚胺已被合成并充分表征,其中含有脂肪族、芳香族或环氧乙烷侧链。所有这些都在非极性甲基环己烷 (MCH) 溶液中形成超分子堆栈,如浓度和温度相关的吸收、圆二色性和荧光研究所证明的。一种衍生物在固态下进行了更详细的研究,并证明是液晶的,并且当从 MCH 滴铸时能够形成纳米级的纤维状网络。光谱技术表明,苝双酰亚胺和低聚(对亚苯基亚乙烯基)(p 型)衍生物在 MCH 中正交自组装成单独的纳米级 p 型和 n 型堆栈。相反,在甲苯中仅存在分子溶解的物质。在由 MCH 和甲苯沉积的薄膜中,光致电子转移发生从 p 型材料到 n 型材料。作为正交自组装过程的结果,在来自 MCH 的薄膜中形成了有序的纤维网络,而在来自甲苯的薄膜中没有观察到有序网络。然而,可能由于表面的横向取向和指向电极的长脂肪链的存在,无法构建高效的体异质结太阳能电池。
Highly Ordered Structures of Amphiphilic Polythiophenes in Aqueous Media
作者:F. Brustolin、F. Goldoni、E. W. Meijer、N. A. J. M. Sommerdijk
DOI:10.1021/ma011334r
日期:2002.1.1
Aqueous dispersions of a regioregular polythiophene, bearing enantiomerically pure oligo(ethylene oxide) side chains, are obtained by injecting small volumes of a THF solution of the polymer into water. The interplay of hydrophilic and hydrophobic interactions accounts for the unprecedented formation of hexagonal platelets, as well as other aggregates. Electron microscopy and selected area electron diffraction revealed that the platelets show diffraction patterns typical for single crystals. The relative amount of these highly ordered structures reaches 30% of all aggregates, in case of dispersions containing 10% (v/v) of THF in water. The effect of the organic solvent in controlling the formation of highly ordered assemblies is also investigated by means of UV-vis spectroscopy, where the occurrence of main chain organization gives rise to a distinct red-shifted absorption band. In the fluorescence spectra, the same situation accounts for quenching of the emission located at higher wavelengths with respect to the one in pure THF. The chiral information in the side chain is expressed at the supramolecular level in the highly ordered states, as revealed by CD spectroscopy. Notably, the intensity of the bisignated Cotton effect reaches its maximum at 10% (v/v) of THF, which coincides with the highest amount of single crystals in TEM. Thermochromic experiments show high thermal stability of the chiral assemblies in water.
Chiral Aggregates of α,ω-Disubstituted Sexithiophenes in Protic and Aqueous Media
作者:A. F. M. Kilbinger、A. P. H. J. Schenning、F. Goldoni、W. J. Feast、E. W. Meijer
DOI:10.1021/ja994231l
日期:2000.3.1
Hierarchical Growth of Chiral Self-Assembled Structures in Protic Media
作者:L. Brunsveld、H. Zhang、M. Glasbeek、J. A. J. M. Vekemans、E. W. Meijer
DOI:10.1021/ja0005237
日期:2000.7.1
created hydrophobic microenvironment account for an unprecedented stabilization of a preferred handedness of the helicalstacks by cooperative intermolecular interactions. The presence of either chirality or achirality at the supramolecular level in the stacks can be tuned by temperature and solvent as judged from circular dichroism spectroscopy. A hierarchical growth of the self-assembly is revealed using