Ln₁₂‐Containing 60‐Tungstogermanates: Synthesis, Structure, Luminescence, and Magnetic Studies

Abstract

A new class of hexameric Ln12 -containing 60-tungstogermanates, [Na(H2 O)6 ⊂Eu12 (OH)12 (H2 O)18 Ge2 (GeW10 O38 )6 ](39-) (Eu12 ), [Na(H2 O)6 ⊂Gd12 (OH)6 (H2 O)24 Ge(GeW10 O38 )6 ](37-) (Gd12 ), and [(H2 O)6 ⊂Dy12 (H2 O)24 (GeW10 O38 )6 ](36-) (Dy12 ), comprising six di-Ln-embedded {β(4,11)-GeW10 } subunits was prepared by reaction of [α-GeW9 O34 ](10-) with Ln(III) ions in weakly acidic (pH 5) aqueous medium. Depending on the size of the Ln(III) ion, the assemblies feature selective capture of two (for Eu12 ), one (for Gd12 ), or zero (for Dy12 ) extra Ge(IV) ions. The selective encapsulation of a cationic sodium hexaaqua complex [Na(H2 O)6 ](+) was observed for Eu12 and Gd12 , whereas Dy12 incorporates a neutral, distorted-octahedral (H2 O)6 cluster. The three compounds were characterized by single-crystal XRD, ESI-MS, photoluminescence, and magnetic studies. Dy12 was shown to be a single-molecule magnet.

Synthesis, structure, and luminescent properties of a family of lanthanide-functionalized peroxoniobiophosphates

“…6a). These are in good agreement with previous results 39, 48 . The 5 D 0 → 7 F 1,3 transitions are magnetic dipole transitions and insensitive to their coordination environments, while 5 D 0 → 7 F 2,4 transitions are electric dipole transitions and sensitive to their local environments 49 .…”

Enhanced Water Dispersibility of Discrete Chalcogenide Nanoclusters with a Sodalite-Net Loose-Packing Pattern in a Crystal Lattice

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High‐field 95Mo and 183W static and MAS NMR study of polyoxometalates

“…Polyoxometalates (POMs) constitute a wide family of inorganic compounds displaying various properties in supramolecular chemistry, medicine, magnetism, catalysis or electrocatalysis . They are also defined as heteropolyanions because of their high negative charge and the presence of heteroatom in their structure built from condensation of monomeric basic oxoanions [MO 4 ] n‐ with M being an early‐transition metal in its highest oxidation state, typically V V , Nb V , Mo VI or W IV .…”