A series of platinum based low-molecular-weight urea-based gelators C1, C2, and C3, mimicking the structure of the anticancer drug cisplatin has been synthesized, as part of the development of a targeted, supramolecular gel phase crystallization and polymorphism screening strategy. Morphological and rheological studies established that inclusion of a longer spacer between the urea and cisplatin-mimetic regions of the gelator (C3) resulted in optimal gelation performance. Interfacial crystallization of cisplatin in a gel–sol biphasic system has been employed to address the insolubility of the drug molecule in organic solvents. A new N,N-dimethylacetamide (DMA) solvate of cisplatin has been identified and a crystal habit modification of the known N,N-dimethylformamide (DMF) solvate form of cisplatin has been observed on crystallization of cisplatin in C3 gels prepared in xylenes. While both targeted and nontargeted gels resulted in the formation of the new DMA solvate, only the targeted C3 gel resulted in high-quality single crystal suitable for characterization by single crystal crystallography. The high crystal quality is attributed to a close match between the core geometry of C3 with that of cisplatin together with local order in the gel fibers of C3.
一系列基于
铂的低分子量
尿素凝胶剂C1、C2和C3被合成,模仿抗癌药物
顺铂的结构,这是开发一种针对性超分子凝胶相结晶和多晶型筛选策略的一部分。形态和流变学研究表明,在凝胶剂中
尿素与
顺铂类区域之间加入较长的间隔(C3)可获得最佳的凝胶性能。
顺铂在凝胶-溶液双相系统中的界面结晶被用于解决该药物分子在有机溶剂中不溶的问题。已识别出一种新的N,N-二甲基乙酰胺(
DMA)
顺铂合晶体,并且在
顺铂在C3凝胶中结晶时观察到已知的
N,N-二甲基甲酰胺(
DMF)合晶体的晶体习性修饰。虽然靶向和非靶向的凝胶都形成了新的
DMA合晶体,但只有靶向的C3凝胶生成了高质量的单晶,适合单晶衍射特性分析。高晶体质量归因于C3的核心几何形状与
顺铂之间的高度匹配,以及C3凝胶纤维中的局部有序结构。