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Description
Lanthanide polyoxometalates (Ln-POMs) have garnered interest due to their diverse structural motifs and potential applications in various fields. In this work, we report the synthesis and characterization of Anderson-type Ln-POMs, with the general formula [Ln(H₂O)x]₂[TeMo₆O₂₄]·yH₂O, where Ln represents lanthanide cations (Tb³⁺, La³⁺, Dy³⁺, Ce³⁺, Sm³⁺, Er³⁺, and Gd³⁺), x corresponds to the number of coordinated water molecules, and y denotes the number of lattice water molecules. These compounds crystallize in two distinct structural types: monomeric and ribbon-like frameworks. The monomeric structures are observed for Ln = Tb³⁺, Dy³⁺, and Er³⁺, with x = 6-7 and y = 10-18. In contrast, the ribbon-like structures are found for Ln = La³⁺, Ce³⁺, Sm³⁺, and Gd³⁺, where x = 5-7 and y = 2-16.A notable feature of this study is the successful synthesis of the Gd³⁺-based compound, [(Gd(H₂O)₇]₂[TeMo₆O₂₄]·4H₂O, via both slow evaporation and microwave-assisted methods, demonstrating the ability to retain the ribbon structure under varying synthetic conditions. Characterization was performed using single-crystal X-ray diffraction (S-XRD), powder X-ray diffraction (PXRD), and infrared spectroscopy, confirming the structural identity of the compounds. Future investigations will focus on exploring the magnetic properties and supercapacitor behavior of these Ln-POMs, which could provide insights into their potential applications in energy storage technologies and multifunctional materials.
Keywords: Lanthanide Anderson polyoxometalates (Ln- AndersonPOMs), Monomeric structures, Ribbon structures, Microwave-assisted synthesis, Supercapacitors, Energy storage
