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The influence of trivalent lanthanide ions on the magnetic field effect of pyrene-dimethylaniline exciplex luminescence

✍ Scribed by Samita Basu; Liudmila Kundu; Mihir Chowdhury

Publisher: Elsevier Science
Year: 1987
Tongue: English
Weight: 397 KB
Volume: 141
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(87)80102-1

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✦ Synopsis

It is observed that the lanthanide acetylacetonates (Ln( acac) ,) quench the magnetic field effect of pyrene-dimethylaniline exciplex luminescence. The quenching rate constants (Q) for the different Ln 3+ ions follow the same trend as was previously observed in the photolysis of quinones and ketones in micellar media. The parallelism of Qs with spin-only moments of Ln'+ ions puzzled previous workers. We have noted a correlation of Qs with the square-root of the de Gennes factor G= (g-l)*J(J+ I), and offer an explanation of our observation on the basis of Heisenberg exchange interaction.

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