A series of lanthanide(iii) complexes constructed from Schiff base and β-diketonate ligands

Abstract

A series of lanthanide(III) complexes constructed from Schiff base and β-diketonate ligands have been synthesized by the same method. They are mononuclear complex [Ln(hfac)₃(L)] (Ln = Nd (1), Sm (2), Eu (3)), tetranuclear complex [Gd₄(OAc)₂(hfac)₁₀(L)₃] (4), dinuclear–mononuclear cocrystal {[Dy(hfac)₂(L)]₂(OAc)}·[Dy(hfac)₄] (5), and mononuclear–mononuclear cocrystal [Yb(hfac)₂(L)]·[Yb(hfac)₄] (6) (L = N,N′-bis(pyridine)-1,2-ethanediamine, hfac = hexafluoroacetylacetonate). Complexes 1–3 and 6 exhibit characteristic metal-centred emission not only in the solid state but also in solution. Lifetimes and quantum yields of luminescence are also determined.