作者:Naba K. Nath、Ashwini Nangia
DOI:10.1021/cg3010097
日期:2012.11.7
The X-ray crystal structures of four fuchsone derivatives in which a chloro group is replaced by methyl were analyzed to understand isostructurality upon Cl–Me exchange in a polymorphic family of molecules. The four methyl groups in tetramethyl fuchsone (TMF, 2,6-dimethyl and α,α-di-p-tolyl) were substituted with chlorine pairwise to give dichloro dimethyl (CMF, 2,6-dichloro and α,α-di-p-tolyl), dimethyl
分析了四种紫杉醇衍生物的X射线晶体结构,其中氯基被甲基取代,以了解在多态分子家族中进行Cl-Me交换时的同构性。将四甲基紫杉酮中的四个甲基(TMF,2,6-二甲基和α,α-二-对甲苯基)成对地取代成氯,得到二氯二甲基(CMF,2,6-二氯和α,α-二-对-甲苯基)对甲苯基),二甲基二氯(MCF,2,6-二甲基和α,α-二-对氯苯基)和四氯衍生物(TCF,2,6-二氯和α,α-二-对苯基)-氯苯基)。前三种化合物是多晶型的,而TCF仅提供一种晶体修饰。TMF,CMF和MCF是同构晶体和同构晶体,属于多晶型物,固溶体和溶剂化物。据报道,紫红色染料中颜色多态性的第一种情况是CMF双晶型。固溶体的形成是最严格的同构性测试之一,对TMF,CMF和MCF观察到,但对TCF观察不到。TCF中的晶体堆积以短的Cl··Cl相互作用为主,因此该晶体结构与前三个成员不同,这在很大程度上是空间填充的结果。使用XP