Quenching of exciplex fluorescence by lithium perchlorate in acetonitrile

✍ Scribed by Marek Mac; Piotr Kwiatkowski; Andrzej M. Turek

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 535 KB
• Volume: 250
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(95)01437-3

✦ Synopsis

Fluorescence quenching of excipiexes, formed by diffusion from excited electron acceptors such as 9-cyanoanthracene and 9,10-dicyanoanthracene, and electron donors such as biphenyl, durene and naphthalene, by lithium perchlorate, in acetonitrile has been measured using fluorescence techniques. It has been found that lithium perchlomte is an efficient quencher of bimolecular charge transfer forms such as exciplexes. The quenching efficiency depends strongly on the charge transfer contribution in the overall exciplex. The Stem-Volmer plots constructed from the exciplex lifetimes or exciplex quantum yields possess negative curvatures. This may be explained on the basis of the partial dissociation of lithium perchlorate in acetonkrile.