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Polymorphs and Transformations of the Solid Forms of Organic Salts of 5-Sulfosalicylic Acid and Isonicotinamide
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2020-11-06 , DOI: 10.1021/acs.cgd.0c00357
Wenlong Duan 1, 2 , Baokai Liu 1 , Ningbo Gong 3 , Antonino Famulari 4 , Fang Guo 1
Affiliation  

Diversities of salts formed by 5-sulfosalicylic acid (5-SSA) and isonicotinamide (INA) were obtained by mechanochemical grinding and from solution, including three polymorphs of (5-SSA-2H)·(INA-H)+·H2O (1) (form 1a, form 1b, and form 1c), dehydration phase (5-SSA-2H)2·(INA-H)2+ (2), solvent phases (5-SSA-2H)·(INA-H)+·MeOH (3) and (5-SSA-2H)2·(INA-H)2+·H2O·MeOH (4), and stoichiometric form (5-SSA-2H)·(INA-H)+·(INA) (5). The work studies not only the stabilities of the three polymorphs and the relationship between solvated 1 and desolvation phase 2 but also the interconversion of these crystalline phases. The dehydrated phase 2 and solvent phase 4 comprising two independent 5-SSA anions and two independent INA cations in the asymmetric unit form an individual ion pair and the corresponding hydrogen bonded networks. The solvent phase (5-SSA-2H)2·(INA-H)2+·H2O·MeOH (4) shows the individual structural features of both (5-SSA-2H)·(INA-H)+·H2O (1) and solvent phase (5-SSA-2H)·(INA-H)+·MeOH (3). All seven salts build up layered structures but comprising a different hydrogen bonding network and can experience a reversible transformation. Quantum mechanics calculations are used to assess the stability of some of the crystalline phases under investigation. The example of salts of 5-SSA and INA comprising a diversity of solid forms reported here can be considered very rare, which has provided a good model for the insight into the structural transformation of materials of interest.

中文翻译:

5-磺基水杨酸和异烟酰胺的有机盐固体形式的多晶型物和转变

通过机械化学研磨并从溶液中获得5-磺基水杨酸(5-SSA)和异烟酰胺(INA)形成的盐的多样性,包括(5-SSA-2H) ·(INA-H)+ ·H 2的三种多晶型物O1)(形式1a,形式1b和形式1c),脱水相(5-SSA-2H)2 ·(INA-H)2 +2),溶剂相(5-SSA-2H) · (INA-H)+ ·MeOH3)和(5-SSA-2H)2 - ·(INA-H)2 + ·H 2 O·MeOH中 4),和化学计量的形式(5-SSA-2H)- ·(INA-H)+ ·(INA) 5)。这项工作不仅研究了三种多晶型物的稳定性以及溶剂化1和去溶剂化相2之间的关系,而且还研究了这些结晶相的相互转化。脱水相2和溶剂相4包含两个独立的5- SSA阴离子和两个独立的INA不对称单元中的阳离子形成单个离子对和相应的氢键网络。溶剂相(5- SSA-2H)2 - ·(INA-H)2 + ·H 2 O·MeOH中4)所示二者的各个结构特征(5- SSA-2H)- ·(INA-H)+ ·H 2 O1)和溶剂相(5-SSA-2H) ·(INA-H)+ ·MeOH3)。所有这七种盐都形成了层状结构,但包含不同的氢键网络,可以经历可逆转化。量子力学计算用于评估研究中某些结晶相的稳定性。此处报道的包含多种固体形式的5-SSAINA盐的例子可以认为非常罕见,这为深入了解目标材料的结构转变提供了一个很好的模型。
更新日期:2020-12-02
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