Collect. Czech. Chem. Commun. 2006, 71, 264-278

Preparation and Structural Characterization of the Intermediate Complex [Er{H2C8H16N4(CH2COO)3(CH2(Ph)PO2)}(H2O)2]2Cl2·xH2O in the Reaction of Er3+ and the dota-Type Ligand. an Interesting Example of Two Stereoforms of a Lanthanide Complex

Pavel Vojtíšeka,* and Jan Rohovecb

a Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic
b Institute of Geology, Academy of Sciences of the Czech Republic, Rozvojová 135, 165 02 Prague 6, Czech Republic


The synthesis of a new H4do3aPPh ligand related to the 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetate (dota) family is described together with its erbium(III) complexes. The complexes constitute a new type of coordination compounds within the Ln-dota family, with the macrocycle protonated and erbium ions above the ring. They represent an intermediate stage on the way from the ligand to the classical in-cavity complexes. In addition, the erbium complexes have been isolated in two stereoforms, differing mainly in the arrangement on the erbium ion. The coordination polyhedra found are dodecahedron and square antiprism.

Keywords: X-Ray diffraction; Lanthanoids; Lanthanide complexes; Erbium; Stereochemistry; Dota ligand; Azacrown compounds.

References: 11 live references.