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首页> 外文期刊>Crystal growth & design >Designing Chiral, Pro-Polar Structures for Observing Ferroelectricity: Molecular Analogue of KNO3
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Designing Chiral, Pro-Polar Structures for Observing Ferroelectricity: Molecular Analogue of KNO3

机译:设计用于观察铁电的手性,极性结构:KNO3的分子类似物

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Observation and creation of a pro-chiral center is a prerequisite in chemical synthesis for generating chiral structures. On the other hand, temporary and reversible generation of chiral or polar structures using physical forces such as electricity is a need of present technology for observing nonlinear behavior. Thus, one can synthesize a pro-polar structure, akin to a pro-chiral center using chemical interactions, for facilitating physical forces in generating chiral/polar structures, a novel way for designing molecular materials. At room temperature, the structure of KNO3 and anilinium nitrate (AnHNO(3)) is centrosymmetric, although the latter showed molecular properties in the form of distinct helical NH center dot center dot center dot O hydrogen bonding to generate a dipole moment, which in turn gets canceled due to the formation of antiparallel double helical chains. We could separate these helical chains of NH center dot center dot center dot O hydrogen bonding, by chemical design, synthesis of analogues molecules (para-ethyl anilinium nitrate), and crystallization through a gel as well slow evaporation technique, to obtain a pro-polar and chiral structure with molecular ferroelectric behavior. Thus, creation of a pro-polar structure, presented here by modifying the cation in KNO3 to observe room temperature ferroelectric behavior, will help in designing novel molecular ferroelectric materials.
机译:观察和建立手性中心是化学合成中产生手性结构的先决条件。另一方面,利用物理力例如电临时和可逆地产生手性或极性结构是观察非线性行为的本技术的需要。因此,可以使用化学相互作用合成类似于前手性中心的前极性结构,以促进产生手性/极性结构时的物理力,这是设计分子材料的新方法。在室温下,KNO3和硝酸铵(AnHNO(3))的结构是中心对称的,尽管后者以明显的螺旋NH中心点中心点中心点O氢键的形式表现出分子性质,从而产生偶极矩,从而由于反平行双螺旋链的形成,转弯被取消。我们可以通过化学设计,合成类似物分子(硝酸对乙基苯胺)和通过凝胶以及缓慢蒸发技术结晶来分离NH中心点中心点中心点O氢键的螺旋链。具有分子铁电行为的极性和手性结构。因此,通过修饰KNO3中的阳离子以观察室温铁电行为,在此提出的前极结构的创建将有助于设计新颖的分子铁电材料。

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