Abstract
AbstractHydrothermal synthesis of two novel inorganic–organic hybrid assemblies, {Na[Ln(pydc‐OH)(H2O)4]3}[SiW12O40]·15H2O [Ln = Nd (1) and Ln = Sm, (2); pydc‐OH = 4‐hydroxypyridine‐2,6‐dicarboxy], and their characterization is described. Structural characterizations by single‐crystal X‐ray diffraction reveal that these compounds are isostructural, and each consists of [SiW12O40]4– Keggin‐type polyoxometalates (POMs) linked by three lanthanide ions to yield discrete trinuclear lanthanide clusters. These discrete molecules are further packed into 3D supramolecular assemblies by means of hydrogen‐bonding and anion–π interactions. Both compounds exhibit remarkable thermal stability. The temperature variation in the magnetic susceptibility χm and of the χmT product and Bohr magnetons of the NdIII (1)‐ and SmIII (2)‐based compounds are considered. The magnetic data have been interpreted relative to data presented in the literature.
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