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Article Dans Une Revue Dalton Transactions Année : 2011

Structure, stability and relaxivity of trinuclear triangular complexes

Elena Torres
  • Fonction : Auteur
Enzo Terreno
  • Fonction : Auteur
Laure Guénée
Carmine Senatore
  • Fonction : Auteur

Résumé

The self-assembly of a carbonylpyridine-based heptadentate ligand with Ln(III) results in the formation of triangular trinuclear europium complexes, which exhibit interesting luminescent properties in the solid state and in solution. With a view to developing multimodal responsive systems, we report here the preparation and characterisation of analogous complexes with Gd(III). The X-ray crystal structure of Gd(3)L2(3) indeed reveals the isostructurality with the Eu(III) complexes. A combination of (1)H NMRD and variable temperature studies yields the parameters elucidating the exchange of coordinated water and relaxivity properties. Conveniently, the competitive spectrophotometric titrations with EDTA and NTA are used to determine the thermodynamic stability constants of the europium complexes in aqueous media. In addition, the exchange reaction with EDTA is monitored with NMR and fluorimetry. The interactions of the Eu(III) trinuclear complex with some potentially interfering ligands are qualitatively investigated by means of luminescence titrations.

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Chimie
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Dates et versions

hal-02122739 , version 1 (07-05-2019)

Identifiants

Citer

Soumaila Zebret, Elena Torres, Enzo Terreno, Laure Guénée, Carmine Senatore, et al.. Structure, stability and relaxivity of trinuclear triangular complexes. Dalton Transactions, 2011, 40 (16), pp.4284-4290. ⟨10.1039/c0dt01739f⟩. ⟨hal-02122739⟩
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