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

It is observed that the lanthanide acetylacetonates (Ln(acac) 3) 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...

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Bibliographic Details
Published in:Chemical physics letters 1987-10, Vol.141 (1), p.115-118
Main Authors: Basu, Samita, Kundu, Liudmila, Chowdhury, Mihir
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Exact sciences and technology
Fluorescence and phosphorescence
radiationless transitions, quenching (intersystem crossing, internal conversion)
Molecular properties and interactions with photons
Physics
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Summary:It is observed that the lanthanide acetylacetonates (Ln(acac) 3) 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 3+ ions puzzled previous workers. We have noted a correlation of Qs with the square-root of the de Gennes factor G = ( g - 1 ) 2 J( J + 1), and offer an explanation of our observation on the basis of Heisenberg exchange interaction.
ISSN:0009-2614
1873-4448
DOI:10.1016/0009-2614(87)80102-1