Synthesis and Studies of the Properties of a Liquid-Crystalline Quaterrylenebis(dicarboximide) by <sup>1</sup>H NMR and UV−vis Spectroscopies
作者:Suk-Wah Tam-Chang、Wonewoo Seo、Isaac K. Iverson
DOI:10.1021/jo030342y
日期:2004.4.1
The synthesis of an ionic quaterrylenebis(dicarboximide) 1a, a long-wavelength absorbing mesogen, is described. When compared with its analogue 2a, an ionic perylenebis(dicarboximide), the aromatic protons of 1a exchange with deuterium of concentrated D2SO4 at a dramatically faster rate. In addition, stronger aggregation in aqueous media was observed for 1a.
描述了长波长吸收性液晶元离子性四亚甲基二(二甲叉酰亚胺)1a的合成。当与其类似物2a(离子per双(二苯甲酰亚胺))比较时,1a的芳族质子与浓缩D 2 SO 4的氘交换的速度大大加快。另外,在水性介质中观察到更强的聚集1a。
Template-guided organization of chromonic liquid crystals into micropatterned anisotropic organic solids
作者:Suk-Wah Tam-Chang、Jennifer Helbley、Travis D. Carson、Wonewoo Seo、Isaac K. Iverson
DOI:10.1039/b508220j
日期:——
We have developed an approach to generate micropatterns of anisotropic organic materials which exploits the self-organization, driven by π-stacking and hydrophobic interactions, of an ionic perylenebis(dicarboximide) 1 in aqueous solutions.
The development of methods to grow well-ordered chromophore thin films on solid substrates is of importance because such surface-associated arrays have potential applications in the generation of functional electronic and optical materials and devices. In this article, we demonstrate a straightforward layer-by-layer (LBL) supramolecular deposition strategy to prepare numerous layers (up to 19) of functionalized perylene diimide (PDI) chromophores built upon a covalent scaffolding multivalent porphyrin monolayer. Our thin film formation strategy employs water as the immersion solvent and exploits the beta-cyclodextrin-adamantane host-guest couple in addition to PDI based aromatic stacking. Within the resultant film the porphyrin scaffold is oriented close to parallel to the glass substrate while the PDI chromophores are aligned closer to the surface normal. Together, the porphyrin monolayer and the multi-PDI layers exhibit a large absorption bandwidth in the visible spectrum. Importantly, because a self-assembly strategy was utilized, when a single monolayer of PDI is deposited on the porphyrin scaffolding layer, this PDI monolayer can be readily disassembled by washing with DMF leading to the regeneration of the porphyrin monolayer. The PDI thin film can subsequently be regrown from the regenerated porphyrin surface. The reported LBL strategy will be of broad interest for researchers developing well-organized chromophoric films and materials due to its simplicity as well as the added advantage of being performed in sustainable and cost-effective aqueous media.
Comparative pharmacological investigation of the cholinoreceptors of skeletal muscle of cat and rabbit
作者:N. V. Khromov-Borisov、M. L. Indenbom、A. F. Danilov
DOI:10.1007/bf00765904
日期:1980.2
MATERIALS AND METHODS FOR THE PREPARATION OF ANISOTROPICALLY-ORDERED SOLIDS
申请人:Carson Travis D.
公开号:US20100108959A1
公开(公告)日:2010-05-06
The invention provides materials and methods for making anisotropic solids which may be in the form of films, layers, shaped elements, and other shaped articles. The methods provide anisotropic solids without the need for rolling, rubbing, or stretching to impart orientational alignment of the molecules of the solid. The methods employ organic or organometallic compounds which are soluble orienting molecules. The solvent or solvent system must be sufficiently volatile to be removed without disruption of the molecular orientation. The soluble orienting molecules include those containing one or more hydrophilic and/or ionic groups and the solvent or solvent system can be a polar organic solvent or solvent system or an aqueous solvent or solvent system. The invention also provides novel compounds having quaterrylene, perylene and naphthalene ring systems carrying one or more hydrophilic and/or ionic groups. These novel compounds can exhibit useful absorption and fluorescence properties in solution and in the solid phase and can exhibit useful liquid crystalline properties.