Selective lithium complexation by photoactive aza-cages bearing the anthracene function

Mario Ciampolini, Mauro Formica, Vieri Fusi, Andrè Saint-Maurice, Mauro Micheloni, Nicoletta Nardi, Roberto Pontellini, Fernando Pina, Paolo Romani, Anna Maria Sabatini, Barbara Valtancoli

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Three aza-cages with the anthracene-containing photoactive groups L1, L2, and L3 have been synthesized. All compounds are able to selectively encapsulate a lithium ion and solid complexes have been isolated. The formation equilibria have been investigated by UV/Vis and 1H, 13C and 7Li NMR spectroscopic techniques. The fluorescence emission of both free ligands and lithium complexes have been investigated. Results indicate that the CHEF (chelation enhancement of the fluorescence) effect obtained by lithium coordination exits although lower than that occurring upon full protonation.

Original languageEnglish
Pages (from-to)2261-2268
Number of pages8
JournalEuropean Journal of Inorganic Chemistry
Issue number12
Publication statusPublished - 1 Jan 1999


  • Coordination
  • Cryptands
  • Fluorescence
  • Lithium
  • Macrocycles


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