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首页> 外文期刊>RSC Advances >Fluorenone imidazolium salts as novel de Vries materials
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Fluorenone imidazolium salts as novel de Vries materials

机译：芴酮咪唑鎓盐作为新型De Vries材料

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In ionic liquid crystals (ILCs) tilted mesophases such as SmC required for electro-optic devices are quite rare. We report a design concept that induced the SmC phase and enabled de Vries-like behaviour in ILCs. For this purpose, we synthesized and characterized a library of ILC derivatives ImR(On,Ym)X which consist of a rigid central fluorenone core containing an alkoxy or thioether side chain and connected via a flexible spacer to an imidazolium head group. The mesomorphic properties were studied by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-ray diffraction (XRD). Temperature-dependent measurements of smectic layer spacing d by small-angle X-ray scattering (SAXS) and of optical tilt angles by POM demonstrate that ILCs ImR(On,Ym)X undergo SmA–SmC phase transitions with maximum layer contraction values between 0.4% and 2.1%. The lowest reduction factor R of 0.2 at the reduced temperature T ? T _(AC) = ?10 K was calculated for Im(O12,S14)Br . Electron density calculations indicated a bilayer structure. Furthermore, temperature dependent emission studies show that self-assembling has a strong influence on the emission intensity of these ILCs.
机译：在离子液晶（ILC）中，电光器件所需的SMC倾斜的中间蛋白酶是非常罕见的。我们报告了一个设计概念，它引起了SMC阶段，并在ILC中启用了类似VRIES的行为。为此目的，我们合成并表征ILC衍生物IMR（ON，YM）X文库，其包括含有烷氧基或硫醚侧链的刚性中央芴酮，并通过柔性垫片连接到咪唑鎓头组。通过差示扫描量热法（DSC），偏振光学显微镜（POM）和X射线衍射（XRD）研究了偏离的态晶特性。通过小角X射线散射（SAX）和POM光学倾斜角度的温度依赖性测量分数D和光学倾斜角度证明了ILCS IMR（ON，YM）X经历了SMA-SMC相变，最大层收缩值0.4之间％和2.1％。降低温度下的最低减小因子r为0.2为IM（O12，S14）BR计算T _（AC）=α10k。电子密度计算指示双层结构。此外，温度依赖排放研究表明，自组装对这些ILC的发射强度有很大影响。

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