A 104- to 105-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 H2O and D2O it can be deduced that in Eu nine or ten H2O molecules coordinate the Eu3⊕ ion, whereas in 1 only two or three H2O 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.
Luminescence Probes: The Eu3⊕- and Tb3⊕-Cryptates of Polypyridine Macrobicyclic Ligands
PERATHONER, Siglinda;
1987-01-01
Abstract
A 104- to 105-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 H2O and D2O it can be deduced that in Eu nine or ten H2O molecules coordinate the Eu3⊕ ion, whereas in 1 only two or three H2O 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.File in questo prodotto:
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