Chiral or Luminescent Lanthanide Single-Molecule Magnets Involving Bridging Redox Active Triad Ligand.

The reactions between the bis(1,10-phenantro[5,6-b])tetrathiafulvalene triad (L) and the metallo-precursors Yb(hfac)₃(H₂O)₂ (hfac⁻ = 1,1,1,5,5,5-hexafluoroacetylacetonato anion) and Dy(facam)₃ (facam⁻ = 3-trifluoro-acetyl-(+)-camphorato anion) lead to the formation of two dinuclear complexes of formula [Yb₂(hfac)₆(L)]·2(C₇H₁₆) ((1)·2(C₇H₁₆)) and [Dy₂((+)facam)₆(L)]·2(C₆H₁₄) ((2)·2(C₆H₁₄)). The X-ray structures reveal that the L triad bridges two terminal Yb(hfac)₃ or Dy(facam)₃ units. (1)·2(C₇H₁₆) behaved as a near infrared Yb^III centered emitter and a field-induced Single-Molecule Magnet (SMM) while (2)·2(C₆H₁₄) displayed SMM behavior in both zero- and in-dc field. The magnetization mainly relaxes through a Raman process for both complexes under an optimal applied magnetic field. [ABSTRACT FROM AUTHOR]