Synthesis, Multiphase Characterization, and Helicity Control in Chiral DACH-Linked Oligothiophenes
作者:Manuela Melucci、Giovanna Barbarella、Massimo Gazzano、Massimiliano Cavallini、Fabio Biscarini、Alessandro Bongini、Fabio Piccinelli、Magda Monari、Marco Bandini、Achille Umani-Ronchi、Paolo Biscarini
DOI:10.1002/chem.200600312
日期:2006.9.25
A new class of chiral oligothiophenes is described. Mono-, bi-, ter-, and quarterthiophenes have been linked to enantiopure trans-1,2-cyclohexanediamine (DACH) via diamino or diimino moieties. The stereochemistry of DACH, the type of linker, and oligothiophene size determine the conformational flexibility of these molecules and consequently their molecular and supramolecular helicity in solution and
描述了一类新的手性寡聚噻吩。单,二,三,四联噻吩已通过二氨基或二亚氨基与对映体纯的反式1,2-环己二胺(DACH)连接。DACH的立体化学,接头的类型和寡聚噻吩的大小决定了这些分子的构象柔性,因此决定了它们在溶液和固态下的分子和超分子螺旋性。详细描述了二氨基双(联噻吩)的情况,其反转螺旋性并在从溶液到膜的转变中显示手性扩增。基于溶液和固态中的圆二色性,单晶/薄膜X射线衍射和偏振光学显微镜的组合使用,提出了一种工作机制来解释这种意外行为。