In search of a new design strategy for solid single-component organic ferroelectrics: Polar crystalline phases formed by bent-core molecules
作者:W. Weissflog、G. Pelzl、H. Kresse、U. Baumeister、K. Brand、M. W. Schröder、M. G. Tamba、S. Findeisen-Tandel、U. Kornek、S. Stern、A. Eremin、R. Stannarius、J. Svoboda
DOI:10.1039/c0jm00322k
日期:——
A new design strategy for solid single-component organic ferroelectrics and pyroelectrics has been developed. The subject is based on five-ring bent-core compounds which have the chemical structure typical for banana-shaped liquid crystals, however, they do not form liquid crystalline phases. Starting from a parent compound, systematic variation of different molecular moieties has lead to the chemical structure forming liquid crystalline compounds and which results in materials exhibiting crystalline modifications only. Calorimetric and polarizing microscopic investigations, X-ray diffraction measurements, dielectric, electro-optic and SHG studies have been used to characterize the new materials. More than 50% of the compounds which do not exhibit a liquid crystalline phase show ferroelectric and/or pyroelectric behaviour in different solid modifications.
针对固体单组分有机铁电和热电开发了一种新的设计策略。该课题基于五环弯核化合物,这些化合物具有香蕉形液晶的典型化学结构,但不会形成液晶相。从母体化合物开始,通过系统地改变不同的分子分子结构,形成了液晶化合物的化学结构,从而使材料仅表现出晶体的变化。量热和偏振显微镜研究、X 射线衍射测量、介电、电光和 SHG 研究已被用于表征新材料。超过 50% 的化合物没有表现出液晶相,但在不同的固体改性中表现出铁电和/或热释电行为。