Macrocycles containing tin. : Ditopic, tricyclic, Lewis acidic hosts with four binding sites

✍ Scribed by Michael T. Blanda; Martin Newcomb

• Book ID: 104229576
• Publisher: Elsevier Science
• Year: 1989
• Tongue: French
• Weight: 292 KB
• Volume: 30
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(00)99424-3

✦ Synopsis

Preparation of the title class of anion-binding hosts is described, and the chloride binding properties of one host are reported. The complexation of anions in organic media by multidentate, neutral, Lewis acidic hosts is a relatively young field of study.' Our contributions in this area have involved the development of macrocyclic* (1) and macrobicyclic3 (2) hosts that contain Lewis acidic tin atoms as the binding sites. Low size selectivity was observed in chloride binding by macrocyclic hosts containing two binding siteszb but substantial size selectivity in binding fluoride, chloride, and bromide anions was found in two-site macrobicycles.3brd Solution "'Sn NMR studies of bicyclic hosts binding anions in halogenated solvents3b*d as well as X-ray crystallographic and solid state ' lgSn NMR studies of bicycle-anion com-plexes3c demonstrate that anions are held in the cavities of the hosts; the selectivity apparently