From Mono- to Polynuclear Coordination Complexes with a 2,2'-Bipyrimidine-4,4'-dicarboxylate Ligand.
Fiche publication
Date publication
mai 2021
Journal
Inorganic chemistry
Auteurs
Membres identifiés du Cancéropôle Est :
Dr CHARBONNIERE Loïc
Tous les auteurs :
Zabierowski PW, Jeannin O, Fix T, Guillemoles JF, Charbonnière LJ, Nonat AM
Lien Pubmed
Résumé
The coordination properties of the ligand 2,2'-bipyrimidine-4,4'-dicarboxylic acid (H) with lanthanide(III) ions (Ln = Eu, Tb, or Lu) were investigated. The syntheses of the H ligand and its salts, [K()(HO)] () and [(NH)Lu()] ( = Et, Hex, or en), are described. In the presence of LnCl salts (Ln = Lu, Eu, or Tb), the formation of [Ln()] and [Ln()(HO)] species was assessed by H nuclear magnetic resonance (NMR), spectrophotometry, and spectrofluorometric titrations in aqueous solution. The solid state structure of , [K(HO)][Lu()] (), and [(EtNH)Lu()] () could be determined by X-ray diffraction, showing the ligand to act as a tetradentate unit with formation of three five-membered chelate rings around the central Ln(III). With the aim of building polynuclear assemblies, the coordination between [Lu()] and [Lu(tta)(HO)] units (tta = thenoyltrifluoroacetylacetonate) was also investigated. In methanol, H NMR titration experiments revealed the formation of complex mixtures from which two new species could be identified, [Lu()(tta)] () and H[Lu()(tta)] (), as confirmed by their solid state structure analysis. Using highly lipophilic cations in chloroform, the octametallic complex [enH][Lu(bpd)(tta)] () could be isolated and its X-ray structure determined.
Référence
Inorg Chem. 2021 May 20;: