Herein we report the synthesis and characterization of several achiral bent-core unsymmetrical compounds exhibiting mesomorphic properties. The lower homologues in two series of compounds show a columnar phase with a rectangular lattice whereas the middle homologues exhibit a novel columnar phase with an oblique lattice. Interestingly, three of the higher homologues of the laterally unsubstituted compounds exhibit a smectic phase with ferroelectric switching characteristics and the analogous fluoro-substituted compounds show a smectic phase that is composed of antiferroelectric conglomerates.
在此,我们报告了几种表现出介形特性的非手性弯曲核不对称化合物的合成和表征。两个系列化合物中的低级同系物显示出具有矩形晶格的柱状相,而中级同系物则显示出具有斜晶格的新型柱状相。有趣的是,横向未取代化合物的三个较高同系物显示出一种具有
铁电开关特性的晶相,而类似的
氟取代化合物则显示出一种由反
铁电聚集体组成的晶相。