作者:Naba K. Nath、Binoy K. Saha、Ashwini Nangia
DOI:10.1039/b804905j
日期:——
Triiodoresorcinol (TIR, 2,4,6-triiodoresorcinol) and triiodophloroglucinol (TIG, 2,4,6-triiodophloroglucinol) crystallized as orthorhombic (TIR-O and TIG-O in P212121) and monoclinic (TIR-M and TIG-M in P21/n) polymorphs mediated via inter-halogen I⋯I interactions. The orthorhombic polymorphs are isostructural and in turn similar to the crystal structure of 1,3,5-triiodobenzene (TIB). The isostructural monoclinic polymorphs are similar to the structure of 1,3,5-trifluoro-2,4,6-triiodobenzene (TIF). Triiodophenol (TIP) crystallized in a single orthorhombic form only. The monoclinic structures have tandem O–H⋯O hydrogen bonds in addition to inter-iodine interactions. The similarity of crystal structures was confirmed by the formation of 1 : 1 binary solid-solutions, TIP + TIR-O and TIR + TIG-O, in orthorhombic space groupP212121. Dimorphs of TIR and TIG establish a structural link in the triiodobenzene series TIB (P212121) → TIP (P212121) → TIR (P212121 and P21/n) → TIG (P212121 and P21/n) → TIF (P21/n). The search for new polymorphs was initiated by isostructurality relationship in the series of compounds.
三碘间苯二酚(TIR,2,4,6-triiodoresorcinol)和三碘氯葡萄糖醇(TIG,2,4,6-triiodophloroglucinol)通过卤素间 I⋯I 相互作用结晶成正交多晶体(P212121 中的 TIR-O 和 TIG-O)和单斜多晶体(P21/n 中的 TIR-M 和 TIG-M)。正交多晶体结构相同,与 1,3,5-三碘苯 (TIB) 的晶体结构相似。等结构单斜多晶体与 1,3,5-三氟-2,4,6-三碘苯 (TIF) 的结构相似。三碘苯酚(TIP)仅以单一的正方体形式结晶。单斜结构中除了碘之间的相互作用外,还有串联的 O-H⋯O 氢键。晶体结构的相似性通过在正交空间群 P212121 中形成 1 : 1 的二元固溶体(TIP + TIR-O 和 TIR + TIG-O)而得到证实。TIR 和 TIG 的二聚形态在三碘苯系列 TIB (P212121) → TIP (P212121) → TIR (P212121 和 P21/n) → TIG (P212121 和 P21/n) → TIF (P21/n) 中建立了结构联系。寻找新的多晶型是通过该系列化合物的等结构关系开始的。