“Cinderella” elements: Strategies to increase the stability of group 1 complexes by tailoring crown macrocycles
作者:Aurora Rodríguez-Rodríguez、Israel Carreira-Barral、David Esteban-Gómez、Carlos Platas-Iglesias、Andrés de Blas、Teresa Rodríguez-Blas
DOI:10.1016/j.ica.2013.11.022
日期:2014.6
Abstract The synthesis and structural characterization of six sodium complexes with bibracchial lariat ethers containing aniline or benzimidazole side arms, and derived from 1,7-diaza-12-crown-4, 1,10-diaza-15-crown-5 or 4,13-diaza-18-crown-6, are reported. The X-ray structures of four of these compounds have been obtained. Additionally, the X-ray structures of a sodium macrobicyclic complex derived from
摘要六种含苯胺或苯并咪唑侧臂的双臂套索状醚的钠配合物的合成和结构表征,分别来自1,7-二氮杂-12-冠-4、1,10-二氮杂-15-冠-5或4,据报道13-diaza-18-crown-6。已获得其中四种化合物的X射线结构。另外,还报道了衍生自1,10-二氮杂-15-冠-5的钠大双环配合物的X射线结构,以及具有含苯胺侧臂的双臂套索状醚的钾配合物的X射线结构。乙腈溶液中的键合距离以及稳定性常数证实,侧基臂的配位为配合物的整体稳定性提供了重要的贡献,特别是当存在苯并咪唑侧基并提供更稳定的配合物时,尤其如此 甚至超过相同大小的cryptand复合体。与母体冠醚相比,当侧臂包含苯并咪唑部分时,稳定性增加,但是当存在苯胺侧臂时,稳定性保持大致相同的顺序。