Induced fit interanion discrimination by binding-induced excimer formation

Maria H. Filby, Sara Jane Dickson, Nelsi Zaccheroni, Luca Prodi, Sara Bonacchi, Marco Montalti, Martin J. Paterson, Terry D. Humphries, Claudio Chiorboli, Jonathan W. Steed

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)


The synthesis, photophysical, and anion-binding properties of a series of di-, tri-, and tetrapodal anion-binding hosts based on aminopyridinium units with pyrenyl reporter groups are described. The ditopic mesitylene-derived calix[4]arene-based host 4 binds strongly to dicarboxylates, particularly malonate, in a 2:1 anion:host ratio but is essentially nonemissive in the presence of all anions except chloride because of intramolecular quenching by the pyridinium units. Addition of chloride results in a conformational change, giving an initial increase in emission assigned to intramolecular excimer formation. Further chloride addition also results in an increase in the intensity of the pyrenyl monomer emission as chloride binding reduces the acceptor ability of the pyridinium groups. This behavior is not exhibited by control compounds 5 and 6, which lack the ditopic geometry and calixarene spacer unit; however, tripodal 6 forms 1:2 anion:host complexes with a range of anions. © 2008 American Chemical Society.

Original languageEnglish
Pages (from-to)4105-4113
Number of pages9
JournalJournal of the American Chemical Society
Issue number12
Publication statusPublished - 26 Mar 2008


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