نتایج جستجو برای: polyoxotungstate
تعداد نتایج: 91 فیلتر نتایج به سال:
Functionalization of the {P8W48} polyoxotungstate (POT) archetype with aromatic organoarsonates results in the first homometallic {P8W48} derivatives, with the general formula [(RAsVO)4PV8WVI48O184]32- [R = C6H5 (1) or p-(H2N)C6H4 (2)]. Short As-O bonds here induce unusual bending of the otherwise rigid {P8W48} macrocycle, breaking its D4h symmetry. The obtained species also represent the first...
A new synthetic method for polynuclear lanthanoid complexes that are embedded in molecular polyoxotungstates has afforded the highest nuclearity polyoxometalate-encapsulated Gd complex and the first decanuclear Yb complex of any sort to be structurally characterized.
The syntheses and structures of a family five new Ln/3d cluster containing polyoxometalates (POMs) [{(GeW9O34)2LnIII3(CO3)(OH2)3}6{3MII2LnIII3(μ3-OH)6(OH2)6}4]50− {Ln30M8}, where Ln = Gd or Y, M Zn, Mn, Co, are presented. This structural motif giant tetrahedron contains {LnIII3} {MII2LnIII3}-cluster units which well-isolated within the diamagnetic polyoxotungstate system. magnetic properties {G...
Two novel polyoxotungstate-based rare earth compounds, [(C5H5N-CO2)2Ln(H2O)3]2[H2W12O40] · nH2O (C5H5N-CO2 = pyridine-4-carboxylate; Ln = La3+ (1), n = 5; Ce3+ (2), n = 7), have been synthesized in aqueous solution and characterized by single-crystal X-ray diffraction, elemental analyses, IR spectra and TG analyses. The isostructural compounds 1 and 2 exhibit onedimensional (1D) zig-zag chains,...
The hierarchical aggregation of molecular nanostructures from multiple components is a grand synthetic challenge, which requires highly selective linkage control. We demonstrate how two orthogonal groups, that is, organotin and lanthanide cations, can be used to drive the giant metal oxide superstructure. title compound {[(Sn(CH3)2)2O]4{[CeW5O18] [TeW4O16][CeSn(CH3)2]4[TeW8O31]4}2}46− (1 a) fea...
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