Composites of Functional Poly(phenylacetylene)s and Single-Walled Carbon Nanotubes: Preparation, Dispersion, and Near Infrared Photoresponsive Properties
the normally used surfactant of sodium dodecyl sulfate. The effective interactions between PPA-m and SWNTs should be ascribed to the helical wrapping of the PPA-m backbone on SWNTs and the π–π interactions between the phenyl groups and SWNTs. The long alkyl tails on the side-chains also prevent individual SWNTs from reaggregation. Additionally, the near-infrared (nIR) photoresponsive electrical conductivity
to investigate anhydrous ionic (proton) conduction and related activation energy (Ea). For this purpose, organic proton conductors are designed in such a way that self-assembly of the molecules can occur via non-covalent interactions giving rise to an organized solid state in which ionic groups are held together via a network of hydrogen bonds. A new class of anhydrous ionic conductors with hydrophobic
在基于聚合物的离子导体中,电导率由于链迁移率低而受到抑制,因此必须设计一种分子系统,其中离子基团可以随温度而动员和固定,以允许离子自由移动以及以低能量屏障的受控方式。在本文中,我们报告了一种创新的方法,可以结合功能化分子的自组装和拆卸概念来研究无水离子(质子)传导和相关活化能(E a)。为此,以如下方式设计有机质子导体:分子的自组装可以通过非共价相互作用发生,从而产生将离子基团保持在一起的有组织的固态通过氢键网络。为燃料电池应用研究了一种新型的具有疏水性和亲水性对应物的无水离子导体,分别是烷基链和膦酸基团。这些离子分子的最高无水质子电导率在140°C时高达10 -2 S cm -1。这些材料的热重分析表明,它们在高达190°C的温度下具有稳定性,因此具有在高温下运行的能力。
Coumarin-based emissive hexacatenars: synthesis, 2D and 3D self-assembly and photodimerization
polycatenars can exhibit highly fluorescent emission with large Stokes shifts (90–118 nm) in solution and as films. Most interestingly, the photodimerization in both LC and non-LC phases led to the formation of absolutely hexagonal columnar LC phases, while photodimerization in gel states led to the formation of flowerlike or 3D porous morphologies. Either columnar phases or gels with flowerlike or ordered
bent-core hexacatenars containing a diphenyl ketone/diphenylmethylene malononitrile as central group and two α-cyanostilbene units as molecular arm were synthesized by Suzuki coupling and Knoevenagel reactions. The effect of the central groups on the liquidcrystalline and photophysical behaviors was investigated in detail. POM, DSC and XRD results indicated that all the compounds could self-assemble
Elucidating the Structure of the<i>Pm</i>$\bar 3$<i>n</i>Cubic Phase of Supramolecular Dendrimers through the Modification of their Aliphatic to Aromatic Volume Ratio
作者:Virgil Percec、Mihai Peterca、Yusuke Tsuda、Brad M. Rosen、Satoshi Uchida、Mohammad R. Imam、Goran Ungar、Paul A. Heiney
DOI:10.1002/chem.200901324
日期:2009.9.14
lattices generated from the supramoleculardendrimers demonstrated that the volume of the aromatic core of the sphericaldendrimers is not dependent on the number of carbon atoms from their alkyl groups. This result facilitated the calculation of the average values of the absolute electron density of the aliphatic and aromatic domains of the sphericalsupramoleculardendrimers. The relative intensity of