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花青盐：仿生离子液晶的新兴核心。

Flavylium Salts: A Blooming Core for Bioinspired Ionic Liquid Crystals.

机构信息

Institut für Organische Chemie, Universität Stuttgart, Pfaffenwalding 55, 70569, Stuttgart, Germany.

Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwalding 55, 70569, Stuttgart, Germany.

出版信息

Chemistry. 2019 Oct 8;25(56):12966-12980. doi: 10.1002/chem.201901975. Epub 2019 Sep 18.

DOI:10.1002/chem.201901975
PMID:31418972
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6856849/
Abstract

Thermotropic ionic liquid crystals based on the flavylium scaffold have been synthesized and studied for their structure-properties relationship for the first time. The mesogens were probed by differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and X-ray diffraction (XRD). Low numbers of alkoxy side chains resulted in smectic (SmA) and lamello-columnar (Lam ) phases, whereas higher substituted flavylium salts showed Col as well as ordered and disordered columnar (Col , Col ) mesophases. Mesophase width ranged from 13 K to 220 K, giving access to room temperature liquid crystals. The optical properties of the synthesized compounds were probed towards absorption and emission properties. Strong absorption with maxima between 444 and 507 nm was observed, and some chromophores were highly emissive with quantum yields up to 99 %. Ultimately, mesogenic and dye properties were examined by temperature-dependent emissive experiments in the solid state.

摘要

基于 flavylium 支架的热致离子液晶已被合成并首次对其结构-性能关系进行了研究。通过差示扫描量热法（DSC）、偏光显微镜（POM）和 X 射线衍射（XRD）对介晶进行了探测。烷氧基侧链数量较少导致形成近晶（SmA）和层状柱状（Lam）相，而取代度较高的 flavylium 盐则显示出 Col 以及有序和无序柱状（Colo、Cold）相。介晶相宽度范围从 13 K 到 220 K，可获得室温液晶。对合成化合物的光学性质进行了吸收和发射性质的探测。观察到最大吸收波长在 444nm 至 507nm 之间，一些生色团具有高达 99%的量子产率，具有很强的发光性。最终，通过固态温度依赖性发射实验研究了介晶和染料性质。

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