Tetranuclear {Ln} complexes possessing homometallic structural subunits: study of magnetic and photoluminescent properties.

A series of homometallic tetranuclear Ln complexes, [Ln(μ-OH){pyC(OH)O}(OCCMe)] [{pyC(OH)O} = monoanionic -diol form of di-2-pyridyl ketone; Ln = Nd (1), Eu (2), Tb (3), Dy (4), Er (5) and Yb (6)], have been synthesized and characterized. The asymmetric unit of each of the tetranuclear derivatives comprises the dinuclear motif, [Ln(μ-OH){pyC(OH)O}(OCCMe)]. The core structure of this Ln family possesses two homometallic structural subunits, LnIII3O, which are further connected through the bridging μ-OH ligands.