Optical Activity of Heteroaromatic Conjugated Polymer Films Prepared by Asymmetric Electrochemical Polymerization in Cholesteric Liquid Crystals: Structural Function for Chiral Induction
We electrochemically polymerized various achiral heteroaromatic monomers in left-handed helical cholesteric liquid crystal (CLC) media. Circular dichroism (CD) spectroscopy revealed that most of the resulting conjugated polymer films exhibited both the first negative and second positive Cotton effects near their absorption maxima. This indicates left-handed helical aggregation of the conjugated main
Synthesis of novel 1,3-bis(5-diarylaminothiophen-2-yl)isothianaphthenes
作者:Roman Kisselev、Mukundan Thelakkat
DOI:10.1039/b202943j
日期:2002.7.1
We report the synthesis, electrochemical and optical properties of novel 1,3-bis(5-diarylaminothiophen-2-yl)isothianaphthenes obtained by palladium-catalysed amination of 1,3-bis(5-bromothiophen-2-yl)isothianaphthene with diarylamines.
Design of reversible multi-electron redox systems using benzochalcogenophenes containing aryl and/or ferrocenyl fragments
作者:Satoshi Ogawa、Hiroki Muraoka、Kenji Kikuta、Fumihito Saito、Ryu Sato
DOI:10.1016/j.jorganchem.2006.08.049
日期:2007.1
2,3-Disubstituted benzo[b]thiophenes, 1,3-disubstituted benzo[c]thiophenes, and 1,3-disubstituted benzo[c]selenophene have been systematically and selectively synthesized from benzo[b]thiophene or phthaloyl dichloride as a starting material, respectively. Characterization of the molecules was performed by physical and spectroscopic means and X-ray crystallographic analyses. The cyclic voltammograms
2,3-二取代的苯并[ b ]噻吩,1,3-二取代苯并[ C ^ ]噻吩,和1,3-二取代苯并[ C ^ ]硒吩已经系统地和选择性地从苯并[合成b分别以]噻吩或邻苯二甲酰二氯为原料。通过物理和光谱学手段以及X射线晶体学分析来进行分子的表征。含芳基硫属元素的硫属元素衍生物的循环伏安图显示,由异常稳定的5π硫属元素化合物自由基阳离子和7π硫属元素化合物自由基阴离子衍生而来的阳极步骤和阴极步骤均具有明确的可逆性。含有二茂铁基片段的新型硫属元素金属衍生物的循环伏安图显示了由异常稳定的7π硫属元素金属自由基阴离子衍生的定义明确的可逆阴极步骤和由二茂铁阳离子彼此隔开的两个不同的可逆阳极步骤,所述二茂铁阳离子彼此之间被噻吩-杂环隔开。
Synthesis and Physical Properties of Benzopyridazine-Based Conjugated Molecules
A series of novel organic conjugated molecules (5a–5d) comprising 2,3‐benzopyridiazine as electron‐withdrawing core and thiophene derivatives as electron‐donating arms have been synthesized successfully in good yields. The ultraviolet‐visible (UV‐Vis) absorption spectra and fluorescence spectra of 5a–5d revealed that the optical properties are strongly influenced by the interactions between nitrogen
The association of aromatic electron donor groups with proquinoid acceptors leads to π-conjugated fluorophores combining tunable emission wavelength at constant geometry, high fluorescence efficiency and high electronaffinity.