New negative dielectric anisotropy liquid crystals based on benzofuran core

Mo, Lingchao; Li, Jian; Che, Zhaoyi; Cao, Yang; Yang, Xiaozhe

doi:10.1080/02678292.2020.1795946

Cited by 6 publications

(2 citation statements)

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“…As a matter of fact, because of these features they have been used for a number of photochemical and optical applications, organic transistors [4], including optical signal processing and storage [5], organic photovoltaic devices [6,7] and switching ferroelectric materials [8]. Over the last few years, a noticeable number of thermotropic liquid crystalline compounds having core units consist of various heterocycles have been designed, prepared and characterized [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Continuing our interest [9][10][11] in finding a facile, efficient and green method for preparation of nitrogen heterocycles, herein, the aim of this work is to investigate an efficient green ball milling solvent-free synthesis of a series of benzimidazoles in a good yield. The outcome of a chemical reaction in a ball mill mainly depends on the amount of energy that is supplied.…”

Section: Introductionmentioning

confidence: 99%

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Solvent-Free Mechanochemical Synthesis of High Transition Biphenyltetracarboxydiimide Liquid Crystals

et al. 2021

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A series of high temperature alkyl and alkoxy biphenyltetracarboxydiimide liquid crystals have been prepared under ball mill method using solvent-free mechanochemical approach. The thermal properties of the prepared compounds were investigated by deferential scanning calorimetry (DSC) measurements and the textures were identified by polarized optical microscope (POM). The compounds showed smectic mesomorphic behaviour. The results showed the increasing nature of transition temperature Cr-SmC with chain length with increments of the SmC mesophase range. However, the mesophase range of the SmA was decreased with the terminal chain length either for the alkyl or alkoxy terminal groups. Moreover, the DFT theoretical calculations have been conducted give a detailed projection of the structure of the prepared compounds. A conformational investigation of the biphenyl part has been studied. A deep illustration of the experimental mesomorphic behaviour has been discussed in terms of the calculated aspect ratio. A projection of the frontier molecular orbitals as well as molecular electrostatic potential has been studied to show the effect of the polarity of the terminal chains on the level and the gab of the FMOs and the distribution of electrostatic charges on the prepared molecules.

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