Lanthanide complexes of 2,2 ',2 ''-(10-{[Hydroxy(phenyl)phosphoryllmethyll}-1,4,7,10-tetraazacyclododecan-1,4,7-triyl)triacetic acid: Structural characterisation of intermediates from the proposed complexation mechanism in the systems of Ln(III)-dota-Type Ligands

摘要

The crystal and molecular structures of ten lanthanide complexes of H(4)do3aP(Ph) [2,2',2"-(10-([hydroxy(phenyl)phosphoryljmethyl)-1,4,7,10-tetraazacyclododecan-1,4,7-triyl)-triacetic acid] are presented here. These complexes constitute a new type of coordination compounds within the Lndota family. They represent an intermediate stage on the way from the ligand to the classical in-cavity complexes. The important role of intramolecular H-bonds for the process was observed. These intermediate complexes in the solid state form several isostructural groups with the different coordination polyhedra (square antiprisma or dodecahedron) of lanthanide ions. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008).