Anion Sensing in Organic Media

Several types of heterocyclic ligands were reported to form luminescent lanthanide complexes exhibiting anion-selective responses in non-aqueous me- 

Yamada et aL apphed Eu complex with 17b in anion sensing upon excitation of pyridine antenna in acetonitrile [127]. Among E , Br , Cl , r, SCN , NOs , CIO4 , acetate, HS04 , and H2P04 anions, only NOs anion gave relevant emission enhancement of the Eu complex (ca. 5-fold). On the contrary, cr and acetate anions offered modest enhancements, and the other tested 

Best and Anslyn presented hybrid-type receptor 49 (Fig. 19), in which a luminescent Eu complex and two quaternary ammonium units were 

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