Anion and Guest Directed Tetracyclic Macrocycles of Ag<sub>5</sub>L<sub>4</sub> and Ag<sub>6</sub>L<sub>4</sub> with an Arc-Shaped Ligand Containing Pyridine and Benzimidazole Units: Reversal of Anion Selectivity by Guest
作者:Avishek Dey、Kumar Biradha
DOI:10.1021/acs.cgd.7b01303
日期:2017.11.1
An arc shaped tridentate ligand pyridine-3,5-bis(1-methyl-benzimidazole-2-yl), L, and Ag(I) were shown to form two isomers of Ag5L4 and Ag6L4 templated by ClO4– and CF3SO3– anions, respectively, in DCM-MeOH. Further, the Ag6L4 cluster containing triflate was also found to form in the presence of nitrobenzene, toluene, and p-xylene. Interestingly, the presence of benzonitrile as guest exhibits reversal of anion selectivity that is perchlorate templated Ag6L4 while triflate templated Ag5L4. The guest exchange form the crystalline solid of Ag6L4 resulted in the solid-to-solid transformation to Ag5L4.
在DCM-MeOH中,弧形三价配体吡啶-3,5-双(1-甲基-苯并咪唑-2-基)、L和Ag(I)分别形成由ClO4-和CF3SO3-阴离子模板化的Ag5L4和Ag6L4两种异构体。此外,在硝基苯、甲苯和对二甲苯存在的情况下,还发现了含有三氟甲磺酸根的Ag6L4簇。有趣的是,作为客体的苯甲腈的存在导致阴离子选择性发生逆转,即高氯酸盐模板化的Ag6L4和三氟甲磺酸盐模板化的Ag5L4。客体交换形成的Ag6L4晶体固体导致固体到固体的转变,形成Ag5L4。