The template synthesis and characterization of pentaaza macrocyclic complexes of rare earth elements. The crystal structure of the 2,14-dimethyl-3,6,10,13,19-pentaazabicyclo[13.3.1]nonadeca-1(19),2,13,15,17-pentaene-dichlorolutetium(III)perchlorate
摘要:
The yttrium and lanthanide ions were found to act as templates for the cyclic [1 + 1] condensation of 2,6-diacetylpyridine with 3,7diazanonane-1,9-diamine to yield 16-membered pentadentate Schiff base macrocyclic complexes with an N-5 set of donor atoms. The complexes were characterized by spectral data (IR, luminescence, H-1 NMR, FAB MS) and elemental analysis. The crystal structure of the lutetium complex was determined by single X-ray analysis providing the first example of the seven-coordination and pentagonal bipyramidal coordination geometry found among the lutetium macrocyclic compounds. (C) 2003 Published by Elsevier Ltd.