C3 symmetric tris(phosphonate)-1,3,5-triazine ligand: homopolymetallic complexes and its radical anion - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue New Journal of Chemistry Année : 2010

C3 symmetric tris(phosphonate)-1,3,5-triazine ligand: homopolymetallic complexes and its radical anion

Résumé

The ligand 2,4,6-tris(dimethoxyphosphonate)-1,3,5-triazine L has been synthesized and its single crystal X-ray structure determined. The occurrence of PQO... p intermolecular interactions, suggested by the short PQO... triazine distances of 3.16–3.35 A ˚ , is observed. The electrochemical reduction of the ligand shows its electron acceptor character by the formation of a stable radical anion. The hyperfine structure observed in the EPR spectra, combined with a theoretical DFT study, evidences the full delocalization of the unpaired electron mainly on the triazine core, with some participation of the phosphonate groups. Theoretical calculations are in agreement with the experimental values of the hyperfine coupling constants of 11.81 G for Aiso–31P and 1.85 G for Aiso–14N. Homopolymetallic complexes, formulated as {L[Cu(hfac)2]3} (1), 1 N{L2[Co(hfac)2]3} (2) and 1 N{L2[Mn(hfac)2]3} (3) (hfac =hexafluoroacetylacetonate), have been synthesized and structurally characterized.

Dates et versions

hal-00531226 , version 1 (02-11-2010)

Identifiants

Citer

Catalin Maxim, Adil Matni, Michel Geoffroy, Marius Andruh, Nigel G. R. Hearns, et al.. C3 symmetric tris(phosphonate)-1,3,5-triazine ligand: homopolymetallic complexes and its radical anion. New Journal of Chemistry, 2010, 34, pp. 2319-2327. ⟨10.1039/c0nj00204f⟩. ⟨hal-00531226⟩
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