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Synthesis and Properties of Sodium and Europium(III) Cryptates Incorporating the 2,2′‐Bipyridine 1,1′‐Dioxide and 3,3′‐Biisoquinoline 2,2′‐Dioxide Units
Author(s) -
Lehn JeanMarie,
Roth Christine O.
Publication year - 1991
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19910740314
Subject(s) - chemistry , europium , luminescence , ligand (biochemistry) , inorganic chemistry , aqueous solution , sodium , oxide , sodium oxide , organic chemistry , ion , receptor , biochemistry , physics , optoelectronics
The sodium and europium cryptates of the new macrobicyclic ligands 2 and 3 incorporating the 2,2′‐bipyri dine 1,1′‐dioxide and 3,3′‐biisoquinoline 2,2′‐dioxide units, respectively, have been prepared. The Eu III complexes present characteristic 1 H‐NMR spectra, showing large shifts, and are strongly luminescent in aqueous solution. These markedly improved luminescent properties, compared to the europium cryptate of the parent macrobicyclic ligand 1 , may be ascribed at least in part to a better shielding of the bound cation by the N ‐oxide sites.