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首页> 外文期刊>Crystal growth & design >Aromatic versus Aliphatic Carboxyl Group as a Hydrogen Bond Donor in Salts and Cocrystals of an Asymmetric Diacid and Pyridine Derivatives
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Aromatic versus Aliphatic Carboxyl Group as a Hydrogen Bond Donor in Salts and Cocrystals of an Asymmetric Diacid and Pyridine Derivatives

机译：芳香族与脂族羧基作为盐的盐和不对称二酸和吡啶衍生物的氢键供体

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摘要

A series of 15 salts and cocrystals of an asymmetric aromatic aliphatic dicarboxylic diacid, N-(2-carboxyphenyl)glycine, and pyridine derivatives was synthesized in order to study whether there is a preference of pyridine binding to either of the carboxylic groups. In nine structures the pyridine was bonded to the aliphatic group, in three to both carboxylic groups, and in three to the aromatic group alone. The preference of pyridine derivatives to bond to the aliphatic group correlates with the more positive electrostatic potential on the aliphatic carboxyl hydrogen atom. The occurrence of proton transfer within the structures was found to follow the basicity of the pyridine derivative, four of the least basic pyridines forming cocrystals, two intermediate bases solids with proton disorder and the more basic pyridine derivatives salts. Proton transfer had a considerable effect on the crystal packing, cocrystals mostly comprising discrete molecular complexes, and salt chains of monoanions.
机译：合成了一系列15个盐和不对称芳族脂族二羧酸二氨基，N-（2-羧基）甘氨酸和吡啶衍生物的盐和酰胺衍生物，以研究是否有吡啶与羧基中任一羧基结合的偏好。在九个结构中，将吡啶键合到脂族基团中，三个至两种羧基，仅在三个芳族基团中。吡啶衍生物与脂族基团结合的偏好与脂族羧基氢原子上的更正静电电位相关。发现结构内的质子转移的发生是遵循吡啶衍生物的碱度，形成吡啶衍生物的四个形成钴，其两种中间体碱具有质子障碍和更碱性吡啶衍生物盐。质子转移对晶体填料具有相当大的作用，主要包括离散的分子复合物和单甘油链的盐链。

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