Abstract
Two Ln4 clusters with the formula of [Ln4(acac)4(µ3OH)2(L)6]·xCH3CN (Ln=Sm (1), Yb (2)) were synthesized through the reaction of Ln(acac)3·2H2O (Hacac = acetylacetone) with the bidentate flexible ligand 5-benzylidene-1,5-dihydroquinolin-8-ol. X-ray diffraction studies indicate that clusters 1 and 2 are isostructural and processes a rhombic-shaped Ln4 core. The coordination geometry of each Ln(III) ion is characterized as a distorted square antiprism. Notably, clusters 1 and 2 exhibit outstanding catalytic performance for the cycloaddition of CO2 with epoxides and for Knoevenagel condensation under mild conditions.
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