Ni II 36 ‐Containing 54‐Tungsto‐6‐Silicate: Synthesis, Structure, Magnetic and Electrochemical Studies
Résumé
The 36-NiII-containing 54-tungsto-6-silicate, [Ni36(OH)18(H2O)36(SiW9O34)6]6- (Ni36) was synthesized by a simple one-pot reaction of the Ni2-pivalate complex [Ni2(μ-OH2)(O2CCMe3)4(HO2CCMe3)4] with the trilacunary [SiW9O34]10- polyanion precursor in water and structurally characterized by a multitude of physicochemical techniques including single-crystal XRD, FT-IR, TGA, elemental analysis, magnetic and electrochemical studies. Polyanion Ni36 comprises six equivalent {NiII6SiW9} units which are linked by Ni-O-W’ bridges forming a macrocyclic assembly. Magnetic studies demonstrated that the {Ni6} building blocks in Ni36 remain magnetically intact while forming a hexagonal ring with antiferromagnetic exchange interactions between adjacent {Ni6} units. Electrochemical studies indicated that the first reduction is reversible and associated with the WVI/V couple, whereas the second reduction is irreversible and associated to the couple NiII/0.
Domaines
Chimie inorganiqueOrigine | Fichiers éditeurs autorisés sur une archive ouverte |
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