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Selective Lithium Complexation by Photoactive Aza‐Cages Bearing the Anthracene Function
Author(s) -
Ciampolini Mario,
Formica Mauro,
Fusi Vieri,
SaintMauricec Andrè,
Micheloni Mauro,
Nardi Nicoletta,
Pontellini Roberto,
Pina Fernando,
Romani Paolo,
Sabatini Anna Maria,
Valtancoli Barbara
Publication year - 1999
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(199912)1999:12<2261::aid-ejic2261>3.0.co;2-8
Subject(s) - chemistry , anthracene , lithium (medication) , protonation , fluorescence , photochemistry , chelation , ion , inorganic chemistry , combinatorial chemistry , organic chemistry , medicine , physics , quantum mechanics , endocrinology
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 1 H, 13 C and 7 Li 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.