An equatorial tri-iron substituted Wells-Dawson type tungstophosphate with magnetic and bifunctional electrocatalytic properties

作者：Zhang, Chun-Dan; Sun, Chun-Yan; Liu, Shu-Xia^*; Ji, Hong-Mei; Su, Zhong-Min

来源：Inorganica Chimica Acta, 2010, 363(4): 718-722.

DOI：10.1016/j.ica.2009.11.029

• Tri-iron substituted
• Equatorial
• Wells-Dawson type
• Bifunctional electrocatalytic activity
• Magnetic property

Interaction of the hexa-lacunary polyanion precursor [alpha-H2P2W12O48](12) and the Fe-III in aqueous solution results in the formation of an equatorial tri-iron substituted Wells-Dawson type compound, K4Cs2Fe2[P2W15(FeOH)(3)O-59]center dot 22H(2)O (1). Compound 1 was characterized by IR, elemental, single-crystal X-ray diffraction, thermogravimetric, magnetic, as well as electrochemical analysis. The polyoxoanion [P2W15(FeOH)(3)O-59](12) can be viewed as a derivative of the parent polyoxoanion [alpha-P2W18O62](6) by removal of three belt W=O groups and then inhabited by three Fe=OH groups. The compound 1-modified carbon paste electrode (1-CPE) presents good electrocatalytic activity not only toward the reduction of nitrite which is attributed to the function of tungstophosphate, but also toward the oxidation of ascorbic acid which is primarily attributed to the function of Fe-III. The magnetic properties of 1 have been studied by magnetic susceptibility and fitted according to an isotropic exchange model. Compound 1 exhibits strong antiferromagnetic spin exchange interactions between the Fe-III centers.

• 出版日期2010-3-1
• 单位东北师范大学