Lanthanide(III) Complexes of 4,10-Bis(phosphonomethyl)-1,4,7,10-tetraazacyclododecane-1,7-diacetic acid (trans-H6do2a2p) in Solution and in the Solid State: Structural Studies Along the Series

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Authors

CAMPELLO M. Paula C. LACERDA Sara SANTOS Isabel C. PEREIRA Giovannia A. GERALDES Carlos F. G. C. KOTEK Jan HERMANN Petr VANĚK Jakub LUBAL Přemysl KUBÍČEK Vojtěch TÓTH Eva SANTOS Isabel

Year of publication 2010
Type Article in Periodical
Magazine / Source Chemistry - A European Journal
MU Faculty or unit

Faculty of Science

Citation
Web
Field Inorganic chemistry
Keywords crystal structures; kinetics; lanthanides; MRI contrast agents; structure elucidation
Description Complexes trans-H6do2a2p (H6L)with transition metal and lanthanide(III) ions were investigated. Values of stability constants complexes are intermediate in the ligand series as a consequence of this ligand basicity. The solid-state structures of the ligand and nine lanthanide(III) complexes were determined by X-ray diffraction. The formation kinetics and the acid-assisted dissociation of several Ln(III)-H6L complexes were investigated. According to the 1H NMR pseudo-contact shifts for the Ce–Eu and Tb–Yb series, the solution structures of the complexes reflect the structures of the [Ce(HL)(H2O)]2– and [Yb(HL)]2– anions, respectively, found in the solid state. However, these solution NMR studies showed that there is no unambiguous relation between 31P/1H lanthanide induced shift (LIS) values and coordination of water in the complexes.
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