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Synthesis and Characterization of a Series of Sulfamethazine Multicomponent Crystals with Various Benzoic Acids
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2020-01-08 , DOI: 10.1021/acs.cgd.9b01209
Matthew C. Scheepers 1 , Andreas Lemmerer 1
Affiliation  

Nine multicomponent crystals consisting of sulfamethazine (sz) with benzoic acid and its derivatives were synthesized and characterized. Eight of the nine multicomponent crystals are cocrystals, while one is a molecular salt. The coformers used to form multicomponent crystals with sz include 2-chloro-4-nitrobenzoic acid (2c4n), 2-chloro-5-nitrobenzoic acid (2c5n), salicylic acid (2hba), 3-hydroxybenzoic acid (3hba), 4-hydroxybenzoic acid (4hba), 4-bromobenzoic acid (4Brba), benzoic acid (ba), cinnamic acid (ca), and toluic acid (ta). These multicomponent crystals were characterized by single-crystal X-ray diffraction (SC-XRD), powder X-ray diffraction (PXRD), and differential scanning calorimetry (DSC). SC-XRD showed that eight of the coformers that interacted with sz formed the amidine-carboxyl synthon; the only exception to this was sz + 4hba, which formed the imidine-carboxyl synthon formed instead. PXRD confirmed that the single crystals were representative of the bulk material. DSC showed most of the multicomponent crystals to have only a melting phase transition, which differed from the melting points of the coformers. The only exceptions were sz + 4brba and sz + ca, where an additional endothermic peak was observed, which corresponds to an amorphous phase transition before melting.

中文翻译:

一系列具有各种苯甲酸的磺胺二甲嘧啶多组分晶体的合成与表征

合成并表征了九种由磺胺二甲嘧啶(sz)与苯甲酸及其衍生物组成的多组分晶体。九种多组分晶体中的八种是共晶体,而一种是分子盐。用于与sz形成多组分晶体的共形成物包括2-氯-4-硝基苯甲酸(2c4n),2-氯-5-硝基苯甲酸(2c5n),水杨酸(2hba),3-羟基苯甲酸(3hba),4-羟基苯甲酸(4hba),4-溴苯甲酸(4Brba),苯甲酸(ba),肉桂酸(ca)和甲苯甲酸(ta)。这些多组分晶体的特征在于单晶X射线衍射(SC-XRD),粉末X射线衍射(PXRD)和差示扫描量热法(DSC)。SC-XRD表明,与sz相互作用的八个共形成者形成了-羧基合成子。唯一的例外是sz + 4hba,它代替了形成的亚胺-羧基合成子。PXRD证实单晶代表了块状材料。DSC显示大多数多组分晶体仅具有熔融相变,其不同于共形成剂的熔点。唯一的例外是sz + 4brbasz + ca,其中观察到另外的吸热峰,其对应于熔化前的非晶相变。
更新日期:2020-01-08
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