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首页> 外文会议>International symposium on polymer physics : Preprints >HELICAL STRUCTURES FROM ACHIRAL BIPHENYL CARBOXYLIC ACID MOLECULES
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HELICAL STRUCTURES FROM ACHIRAL BIPHENYL CARBOXYLIC ACID MOLECULES

机译：非手性联苯甲酸分子的螺旋结构

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@@Helical structures were constructed from achiral 4biphenyl carboxylic acid molecules (BPCA-Cn-PmOH) connected with phenol at meta-position by alkoxyl chains with various carbon numbers. In order to understand the origin of helical structures, four other achiral 4-biphenyl carbonyl model compounds were studied using a combination of techniques. to recognize the importance of hydrogen (H)-bonding between hydroxyl groups and the small kink at the end of the phenyl groups, the hydroxyl group at the metaposition of phenyl groups in BPCA-C6-PmOH was first moved to the para-position to become BPCA-C6-PpOH, and then changed to a methoxy group to become BPCAC6-PmOH3. BPCA-C6-P, having no functional groups on the phenyl groups, was also synthesized. Finally, one more compound was synthesized to disrupt the formation of the H-bonded head-to-head dimers by replacing the H group on the carboxylic acid with an ethyl group to become BPCE-C6-PmOH. Phase structures of this series of compounds were characterized by wide-angle X-ray diffraction (WAXD), selected area electron diffraction, and differential scanning calorimetry.
机译：由非手性的四联苯基羧酸分子（BPCA-Cn-PmOH）与苯酚在间位通过具有不同碳原子数的烷氧基链连接而构成螺旋结构。为了理解螺旋结构的起源，使用了多种技术，对另外四种非手性4-联苯基羰基模型化合物进行了研究。为了认识到羟基与苯基末端的小纽结之间氢键（H）的重要性，首先将BPCA-C6-PmOH中苯基间位的羟基移至对位变成BPCA-C6-PpOH，然后变成甲氧基变成BPCAC6-PmOH3。还合成了在苯基上没有官能团的BPCA-C6-P。最后，通过用乙基取代羧酸上的H基团成为BPCE-C6-PmOH，合成了另一种化合物以破坏H键合的头对头二聚体的形成。该系列化合物的相结构通过广角X射线衍射（WAXD），选定区域电子衍射和差示扫描量热法进行表征。

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