Synthesis and Properties of Macrobicyclic Cryptates Incorporating Five- and Six-Membered Biheteroaryl Units

Article abstract of DOI:10.1002/hlca.19920750422

The sodium cryptates of the macrobicyclic ligands 1-6 have been synthesized by direct macrobicyclisation or by stepwise procedures.They incorporate 2,2'-bithiazole, 2,2'-biimidazole, 2,2'-bipyrimidine as well as 2,2'-bipyridine units.Treatment of the sodium complexes with europium(III) chloride gave the corresponding Eu^III cryptates.The structural and spectral properties of these compounds are described.The Eu^III complexes present characteristic 1H-NMR chemical-shift features.Their luminescence properties are described.