ic6b01468_si_002.cif (1.85 MB)
A Pyridazine-Bridged Sandwiched Cluster Incorporating Planar Hexanuclear Cobalt Ring and Bivacant Phosphotungstate
dataset
posted on 2016-08-22, 10:29 authored by Ling-Yu Guo, Su-Yuan Zeng, Zvonko Jagličić, Qi-Dong Hu, Shi-Xuan Wang, Zhi Wang, Di SunA planar hexanuclear
cobalt ring was clamped by two bivacant α1-[PW10O37]9– with the assistance of
the pyridazine bridges to form a novel sandwiched Co(II)-polyoxometalate
cluster compound, [Na(H2O)6][Co3(OH) (pydz)4(H2O)7][Co6(PW10O37)2(pydz)4(H2O)6]·43H2O (1; pydz = pyridazine).This cluster was identified by X-ray single-crystal
diffraction, elemental analysis, Fourier transform IR and UV–visible
spectroscopies, and cyclic voltammetry (CV). Structural analysis reveals
that 1 comprises a hexahydrated sodium, a trinuclear
[Co3(OH) (pydz)4(H2O)7]5+ cationic cluster, and an anionic [Co6(PW10O37)2(pydz)4(H2O)6]6– sandwiched cluster, thus
giving an intrinsical intercluster compound. The isolation of such
cluster was dependent on the in situ transformation of trivacant [α-P2W15O56]12– to α1-[PW10O37]9– under the hydrothermal condition. The
CV shows reversible multielectron waves from the redox of WVI in 1. Cluster 1 exhibits remarkable electrocatalytic
activity toward the reduction of nitrite. Magnetism studies indicated
a weak anti-ferromagnetic exchange interaction between Co(II) ions
within 1.
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Co 3cyclic voltammetrymultielectron wavesStructural analysisOHhexanuclear cobalt ringanti-ferromagnetic exchange interactionhexahydrated sodiumW VIBivacant Phosphotungstateintrinsical intercluster compoundhydrothermal conditionX-ray single-crystal diffractionpydzCo 6Cluster 1 exhibitspyridazine bridgesmagnetism studiesH 2 OCVUVPW 10 O 37IRelectrocatalytic activityCluster Incorporating Planar Hexanuclear Cobalt Ring
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