Synthesis and crystallographic study of six quaternary salts of N-halomethylated and non-N-halomethylated ammonium: Importance of C-H‧‧‧X (X=F, I) and I‧‧‧I− halogen interactions in the supramolecular structures
作者:Deysy Andrea Molina Giraldo、Luz Amalia Ríos Vásquez、Rubén A. Toscano、Rogelio Ocampo-Cardona、Jessica Johanna Gomez-Peña、Mario A. Macías
DOI:10.1016/j.molstruc.2022.133962
日期:2023.1
compounds is controlled by C-H‧‧‧X (X=F, I or I−) and I‧‧‧I− interactions with a complete absence of classic hydrogen bonds. The detected H‧‧‧X and I‧‧‧I− distances are very short compared with the values normally observed in literature. The results suggest that, in the lack of other hydrogen bonds, halogen atoms form strong interactions and, in the case of these salts, control completely the supramolecular
六种盐的合成,N-卤代甲基化 (1a,1b,1c) 和非 N-卤代甲基化 (2a,2b,2c),通过以下四步序列实现: (i) 从p -( F)C 6 H 4 MgBr 和 Br(CH 2 ) n+1 COOEt;(ii) 所得叔醇 Br(CH 2 ) n+1 C(OH) (C 6 H 4 - p -F) 2的酸催化脱水;(iii) 在所得烯烃中用二甲胺水溶液进行溴化物取代 Br(CH 2 )nCH=C(C 6 H 4 - p F) 2; (iv)通过(CH 3 ) 2 N(CH 2 ) n CH=C(C 6 H 4 - p F) 2的所得胺与CH 2 I 2反应置换碘化物阴离子。这些化合物在水-异丙醇的二元混合物中缓慢蒸发结晶。晶体学研究表明,这些化合物的晶体生长受 CH‧‧‧X(X=F、I 或 I -)和 I‧‧‧I -相互作用控制,完全没有典型的氢键。检测到的H‧‧‧X和I‧‧‧I