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Structure, stability and relaxivity of trinuclear triangular complexes.
Zebret, Soumaila; Torres, Elena; Terreno, Enzo; Guénée, Laure; Senatore, Carmine; Hamacek, Josef.
Afiliação
  • Zebret S; Department of Inorganic, Analytical and Applied Chemistry University of Geneva, 30 quai E.-Ansermet1211, Geneva, Switzerland.
Dalton Trans ; 40(16): 4284-90, 2011 Apr 28.
Artigo em Inglês | MEDLINE | ID: mdl-21394331
ABSTRACT
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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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Assunto principal: Elementos da Série dos Lantanídeos Idioma: Inglês Revista: Dalton Trans Assunto da revista: Química Ano de publicação: 2011 Tipo de documento: Artigo País de afiliação: Suíça