SYNTHESIS AND PROPERTIES OF MACROBICYCLIC CRYPTATES INCORPORATING 5-MEMBERED AND 6-MEMBERED BIHETEROARYL UNITS

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 H-1-NMR chemical-shift features. Their luminescence properties are described.