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Luminescence Probes: The Eu 3⊕ ‐ and Tb 3⊕ ‐Cryptates of Polypyridine Macrobicyclic Ligands
Author(s) -
Alpha Béatrice,
Balzani Vincenzo,
Lehn JeanMarie,
Perathoner Siglinda,
Sabbatini Nanda
Publication year - 1987
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.198712661
Subject(s) - luminescence , chemistry , molecule , aqueous solution , ion , absorption (acoustics) , ligand (biochemistry) , photochemistry , europium , metal , inorganic chemistry , materials science , organic chemistry , biochemistry , receptor , optoelectronics , composite material
A 10 4 ‐ to 10 5 ‐times more intense absorption than the corresponding aqua complexes is exhibited by the cryptates 1 and 2; in the latter the ligand absorbs, in the former the metal ion. From the luminescence‐lifetimes in H 2 O and D 2 O it can be deduced that in Eu aq 3⊕nine or ten H 2 O molecules coordinate the Eu 3⊕ ion, whereas in 1 only two or three H 2 O molecules coordinate. Even in 10 ‐5 molar aqueous solutions, 1 and 2 can absorb 1% of the incident UV photons and emit them again as visible light.