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首页> 外文期刊>Crystal growth & design >Molecular Assemblies of Tetrahedral Triphenylmethanol and Triphenylamine Derivatives Bearing -NHCOCnH2n+1 Chains
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Molecular Assemblies of Tetrahedral Triphenylmethanol and Triphenylamine Derivatives Bearing -NHCOCnH2n+1 Chains

机译：四面体三苯基甲醇和三苯胺衍生物轴承的分子组装 - 鼻腔蛋白α1链

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摘要

Nonplanar three-fold symmetrical triphenylmethanol (1: n = 10 and 2: n = 3) and triphenylamine (3: n = 10 and 4: n = 3) derivatives bearing three alkylamide (-NHCOCnH2n+1) chains were studied in terms of their phase transitions, molecular assemblies, nano- or meso-structures, and dielectric responses. Slight modification of the structural core from a hydroxyl moiety (C-OH in 1) to a nitrogen atom (N in 3) drastically changed the molecular assembly structures and physical properties in solids. The molecular assembly of 1 showed a glass plastic crystal phase transition at similar to 340 K, whereas 3 only displayed a direct solid liquid phase transition. Uniform microscale spheres and nanowires with average diameters of 2 mu m and 200 nm, respectively, were observed for the molecular assemblies of 1 and 3 on substrate surfaces, respectively, corresponding to amorphous glass and one-dimensional hydrogen-bonding columnar structures. An alpha-type frequency- and temperature-dependent dielectric relaxation was observed in amorphous 1 during the glass plastic crystal phase transition, whereas no dielectric anomalies were observed for 3. This difference was attributed to the subtle chemical modification of the central core from C-OH to N.
机译：在载有三种烷基酰胺（-NHCOCNH2N + 1）链的情况下，研究了载有三种烷基酰胺（-NHCOCNH2N + 1）链的三苯胺（3：n = 10和2：n = 3）和三苯胺（3：n = 10和4：n = 3）衍生物。它们的相转变，分子组件，纳米或中间结构和介电反应。从羟基部分（C-OH In 1）中的结构芯的轻微改性到氮原子（N in 3）大大改变了固体中的分子组装结构和物理性质。图1的分子组件显示了类似于340 k的玻璃塑料晶相转变，而3仅显示直接固体液相过渡。分别观察到具有2μm和200nm的平均直径的均匀微观球体和纳米线，用于对应于非晶玻璃和一维氢键柱结构的基材表面的分子组件。在玻璃塑料晶体相转变期间在无定形体1中观察到α型频率和温度依赖性介电弛豫，而没有观察到介电异常。该差异归因于C-中央核心的微妙化学改性。哦，到了n。

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