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Spectroscopic and photophysical properties of the Europium (III) Cryptate [Eu3+ ⊂ 2.2.1]

✍ Scribed by Nanda Sabbatini; Sergio Dellonte; Mauro Ciano; Alessandro Bonazzi; Vincenzo Balzani

Publisher: Elsevier Science
Year: 1984
Tongue: English
Weight: 527 KB
Volume: 107
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(84)85702-4

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✦ Synopsis

The spectroscopic and photophysical properties of [ Eu3+ c 2.2.11 have been investigated. High-resolution emission spectra in aqueous solution are compatible with the presence of only one Eu-containing species with Czy symmetry. The emission quantum yields indicate that the conversion of the charge-transfer levels to the 5Do emitting state is relatively inefficient. Luminescence decay measurements show that encapsulation of Eu3*in the cryptand cage does not completely shield the metal ion from interaction with the solvent, since three water molecules are still coordinated to Eu3' through the cryptand holes.

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