A series of salts, solvates and co-crystals formed by reaction of the isomers of lutidine and picoline with pamoic acid have been prepared and characterised. These reactions were carried out in the solvents DMF and NMP in an attempt to understand the role of the solvent in the structure type observed. A total of 16 new structures are described and compared to the known structures of lutidinium pamoate previously obtained from neat lutidine or from THF. A number of structural features previously observed in these systems reappear in this study, as well as some entirely novel structure types. The solvent does not only fulfill a space-filling role, but rather seems to influence the state of ionisation of the pamoate moiety, which appears to be the major contributor to the crystal structure observed.
一系列由异构的
胡椒环和
吡啶与双
羧酸(pamoic acid)反应形成的盐、溶剂化物和共晶已被制备并表征。这些反应在
DMF和
NMP溶剂中进行,旨在理解溶剂在所观察到的结构类型中的作用。共描述了16种新的结构,并与之前从纯
胡椒环或THF中获得已知的
胡椒环双
羧酸盐结构进行了比较。在本研究中,这些体系中先前观察到的许多结构特征再次出现,同时也出现了一些全新的结构类型。溶剂不仅填充空间,更似乎影响了双
羧酸部分的离子化状态,这似乎是观察到的晶体结构的主要贡献因素。