A dimeric polyoxometalate sandwich motif containing a truncated {Mn3O4} cubane core

作者：Mitchell Scott G; Miras Haralampos N; Long De Liang; Cronin Leroy^*

来源：Inorganica Chimica Acta, 2010, 363(15): 4240-4246.

DOI：10.1016/j.ica.2010.07.020

• Polyoxometalates
• Silicotungstate
• Lacunary Keggin
• Cubane core
• Self assembly
• Crystallography

A novel sandwich-type silicotungstate motif, K-18[Mn-2(II){Mn-II(H2O)(5)Mn-3(III)(H2O)(B-beta-SiW9O34)(B-beta-SiW6O26)}2]center dot 20H(2)O 1, has been isolated from the reaction of K-8[gamma-SiW10O36]center dot 12H(2)O and manganese ions in aqueous acidic media. The transition metal-substituted polyoxometalate (TMSP) 1 has been fully characterized by single-crystal X-ray diffraction, elemental analysis, thermogravimetric analysis, and infrared spectroscopy. This dimeric polyanion consists structurally of the sandwich polyanion {Mn-II(H2O)(5)Mn-3(III)(H2O)(B-beta-SiW9O34)(B-beta-SiW6O26)}, dimerized via two manganese(II) linker ions. Each monomeric unit is composed of two non-equivalent Keggin fragments, (B-beta-SiW8O31) and (B-beta-SiW6O26), linked to each other via three manganese ions resulting in a truncated {Mn3O4} cubane core. Experimental, structural, and electrochemical aspects of the material are reported and discussed.

• 出版日期2010-12-10