Ionic liquid crystals containing pyridinium and pyrazolium units: mesomorphism and acidochromic behaviors

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments Pub Date : 2025-07-19 DOI:10.1016/j.dyepig.2025.113050

Rosario Criado , Frederico Duarte , Irene Caro-Campos , Mercedes Cano , Santiago Herrero , Carlos Lodeiro , Cristián Cuerva

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Abstract

Ionic liquid crystals are soft materials whose mesomorphic behavior can be strategically modulated as a function of their components, considering both the design of the organic cation and the nature of the inorganic anion. A new pyridylpyrazole derivative has been synthesized and used as a precursor for obtaining ionic salts that contain the corresponding dicationic fragment and different counterions. Most salts behave as liquid crystal materials exhibiting smectic A mesophases at temperatures ranging between 99 and 295 °C, as well as luminescence behavior in solution and/or the solid state. Interestingly, the related chloride salt emits blue light in the solid state under excitation at 261 nm, in contrast to the absence of the emission of the initial pyridylpyrazole derivative. This turn-on fluorescence response has been exploited to fabricate polymer supports that show a bright blue emission under exposure to hydrochloric acid.

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含有吡啶和吡唑基的离子液晶：中形性和酸致变色行为

离子液晶是一种软质材料，考虑到有机阳离子的设计和无机阴离子的性质，其介态行为可以作为其成分的函数进行战略性调节。合成了一种新的吡啶基吡唑衍生物，并以其为前驱体制备了含有相应阳离子片段和不同反离子的离子盐。大多数盐表现为液晶材料，在99 ~ 295℃的温度范围内表现为近晶A中间相，以及在溶液和/或固体状态下的发光行为。有趣的是，相关的氯盐在261nm激发下在固态下发出蓝光，而初始的吡啶基吡唑衍生物则没有发出蓝光。这种开启荧光反应已被用于制造暴露于盐酸下显示亮蓝色发射的聚合物支架。

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来源期刊

Dyes and Pigments 工程技术-材料科学：纺织

CiteScore

8.20

自引率

13.30%

发文量

933

审稿时长

33 days

期刊介绍： Dyes and Pigments covers the scientific and technical aspects of the chemistry and physics of dyes, pigments and their intermediates. Emphasis is placed on the properties of the colouring matters themselves rather than on their applications or the system in which they may be applied. Thus the journal accepts research and review papers on the synthesis of dyes, pigments and intermediates, their physical or chemical properties, e.g. spectroscopic, surface, solution or solid state characteristics, the physical aspects of their preparation, e.g. precipitation, nucleation and growth, crystal formation, liquid crystalline characteristics, their photochemical, ecological or biological properties and the relationship between colour and chemical constitution. However, papers are considered which deal with the more fundamental aspects of colourant application and of the interactions of colourants with substrates or media. The journal will interest a wide variety of workers in a range of disciplines whose work involves dyes, pigments and their intermediates, and provides a platform for investigators with common interests but diverse fields of activity such as cosmetics, reprographics, dye and pigment synthesis, medical research, polymers, etc.