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首页> 外文期刊>Russian Journal of Physical Chemistry >Structure and intermolecular interactions in ionic liquid crystals doped with electrochromic viologen
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Structure and intermolecular interactions in ionic liquid crystals doped with electrochromic viologen

机译：掺杂电致变色紫精的离子液晶的结构和分子间相互作用

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摘要

The results of an investigation of structural and electrooptical properties of potassium caprylate lyotropic liquid crystals (LCs) doped with electrochromic viologen are presented. The samples are colored when an electric field is applied. The color deepens with the voltage applied, and relevant features appear in electronic absorption spectra. Two stages may be recognized in the processes that occur in a sample in the field. The first stage (at 2-2.5 V) involves the formation of radical cations (RCs) from viologen molecules, which makes the samples blue (two absorption bands appear at 395 and 610 ran in optical spectra). At the second stage (at 3.5-4 V), the radical cations are dimerized, and the sample becomes red (the spectra show bands in the region of 365 and 520 nm). Absorption in a lyotropic LC increases with the viologen concentration increasing from 1 to 4%. Small-angle X-ray scattering was measured on unoriented samples of pure potassium caprylate with thicknesses ranging from 30 mu m to 1 mm. In all samples, a smectic order was observed in lyotropic ionic LC (LILC). From the X-ray scattering data, the bilayer thickness and the smectic correlation length were computed. It was inferred that viologen molecules, when present in low concentrations (2-4%), are organically incorporated into the matrix without spoiling the layer order intrinsic to the matrix.
机译：给出了掺杂有电致变色紫精的辛酸钾溶致液晶（LCs）的结构和电光性质的研究结果。施加电场时，样品会着色。颜色随着施加的电压而加深，并且相关特征出现在电子吸收光谱中。在现场样品中发生的过程中，可以识别出两个阶段。第一阶段（2-2.5 V）涉及从紫精分子形成自由基阳离子（RC），使样品变蓝（光谱中的395和610处出现两个吸收带）。在第二阶段（在3.5-4 V下），自由基阳离子被二聚化，并且样品变为红色（光谱显示365和520 nm范围内的谱带）。溶致液晶中的吸收随着紫精浓度从1％增至4％而增加。在未定向的纯辛酸钾样品上测量了小角度X射线散射，厚度为30微米至1毫米。在所有样品中，在溶致离子LC（LILC）中观察到近晶顺序。根据X射线散射数据，计算双层厚度和层列相关长度。可以推断，当紫精分子以低浓度（2-4％）存在时，会有机掺入基质中，而不会破坏基质固有的层序。

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