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Updated: Aug 7, 2025

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
Published on: July 21, 2011
Lanthanide-Based Coordination Polymers Molecular Alloys Stability: A Thermochemical Approach
Chloé Blais1, Thibaut Morvan1,2, Carole Daiguebonne1
1Institut des Sciences Chimiques de Rennes, Univ Rennes, INSA Rennes, CNRS UMR 6226, 35708 Rennes, France.
Abstract:
In this study, we investigate the thermodynamics of lanthanide-based coordination polymer molecular alloys. We demonstrate that if lanthanide ions have many chemical similarities, the solubility of homo-lanthanide-based coordination polymers can vary significantly from one lanthanide ion to another. Indeed, we experimentally determine the solubility constants of a series of isostructural homo-lanthanide coordination polymers, with general chemical formula [Ln2(bdc)3(H2O)4]∞ with Ln = La-Er plus Y and where bdc2- symbolizes 1,4-benzene-di-carboxylate. Then, we extend the study to two series of isostructural molecular alloys with general chemical formula [Ln2Ln'2 -2(bdc)3(H2O)4]∞ with 0 ≤ x ≤ 1 based either on heavy ([Eu2Tb2 - 2(bdc)3(H2O)4]∞) or light ( [Nd2Sm2-2(bdc)3(H2O)4]∞) lanthanide ions. We found that whatever the solubility difference of the homo-nuclear compounds is, the configurational entropy is the main driving force of the stabilization of molecular alloys.
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