Self‐Assembled Tetrameric Lanthanide‐Containing Germanotungstates [(Ln₂GeW₁₀O₃₈)₄(W₃O₈)(OH)₄(H₂O)₂]²⁶⁻: Syntheses, Crystal Structure, Photoluminescence and Electrochemical Properties.

Abstract

A series of six lanthanide‐containing germanotungstates of the formula: [(Ln2GeW10O38)4(W3O8)(OH)4(H2O)2]26− (Ln=Sm (1), Eu (2), Gd (3), Tb (4), Dy (5), Ho (6) have been synthesized under ambient conditions. The synthetic procedure involves the use of trilacunary Na10[A‐α‐GeW9O34]⋅16H2O as a preformed precursor along with lanthanide salts in 0.5 M potassium chloride solution. The interaction of the trilacunary Na10[A‐α‐GeW9O34]⋅16H2O with the lanthanide salts leads to the formation of a tetrameric structure with four [GeW10O36]8− dilacunary Keggin units incorporating eight lanthanide ions and three additional tungsten atoms. All the polyanions were structurally characterized by Fourier‐transform infrared spectroscopy (FT‐IR), Single Crystal X‐ray Diffraction (SC‐XRD), UV/Visible spectroscopy, thermogravimetric analysis (TGA), electrochemistry, Electron‐spray ionization mass spectroscopy (ESI‐MS), Powder X‐ray diffraction (PXRD) and photoluminescence. FT‐IR spectroscopy reveals that all the polyanions are isomorphous and SC‐XRD shows that all the polyanions are isostructural and crystalize in the triclinic crystal system with P1‾ space group. Some of the polyanions show good photoluminescence properties. The cyclic voltammograms (CVs) of all the six compounds exhibit the same shape, each being composed of a pronounced reduction wave.

Tetrameric Lanthanide‐Substituted Silicotungstate {Ln8Si4W40} Nanoclusters: Synthesis, Structural Characterization, Electrochemistry, and Catalytic Application for Oxidation of Thioethers

“…Thereafter, germanotungstate analogs were reported by Hussain et al . in 2019 [24] . In addition with POMs, recently many other coordination complexes were also reported for its applications in the field of catalysis and magnetism [25–28] .…”

Synthesis, Characterization, Electrochemistry, Photoluminescence and Magnetic Properties of a Dinuclear Erbium(III)-Containing Monolacunary Dawson-Type Tungstophosphate: [{Er(H2O)(CH3COO)(P2W17O61)}2]16−

“…However, in Ln-POMs due to their larger sizes and consequently larger coordination numbers compared to 3d metal ions, the formation of lanthanide-oxo-hydroxo clusters within the POM framework has been rarely observed [ 9 , 11 , 12 ]. Until now, there are only a few reports on the sandwich-type Ln-POM family, where lanthanide metal centers (Ln III nuclearity ≥ 2) are sandwiched between two lacunary POM ligands [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Lanthanide-containing POM assemblies have demonstrated outstanding properties in various fields of research such as molecular magnetism [ 27 ], imaging [ 28 ], photoluminescence [ 29 ], catalysis [ 30 , 31 ] and electrochemistry [ 32 ].…”