From Mono- to Polynuclear Coordination Complexes with a 2,2’-Bipyrimidine-4,4’-dicarboxylate Ligand - Archive ouverte HAL
Article Dans Une Revue Inorganic Chemistry Année : 2021

From Mono- to Polynuclear Coordination Complexes with a 2,2’-Bipyrimidine-4,4’-dicarboxylate Ligand

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.

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Dates et versions

hal-03247467 , version 1 (19-10-2021)

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Piotr W Zabierowski, Olivier Jeannin, Thomas Fix, Jean-François Guillemoles, Loïc J Charbonnière, et al.. From Mono- to Polynuclear Coordination Complexes with a 2,2’-Bipyrimidine-4,4’-dicarboxylate Ligand. Inorganic Chemistry, 2021, 60 (11), pp.8304-8314. ⟨10.1021/acs.inorgchem.1c00938⟩. ⟨hal-03247467⟩
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