The Pb2+ ion as a template in the synthesis of macrocyclic ligands; X-ray structure of 3,15,21-triaza-6,9,12-trioxabicyclo[15.3.1]heneicosa-1(21), 2,15,17,19-pentaene(thiocyanato)(isothiocyanato)lead(II)
Abstract
Novel, eight co-ordinate complexes, Pb(macro-cycle)(NCS)2, are formed in good yield in hydroxylic solvents by the template condensation of 2,6-diacetyl-pyridine or pyridine-2,6-dicarbaldehyde with 1,11-di-amino-3,6,9-trioxaundecane in the presence of Pb2+ ion.