Inorganic Chemistry, Vol.53, No.14, 7309-7318, 2014
Preparation, Structural Characterization, and Ion-Exchange Properties of Two New Zeolite-like 3D Frameworks Constructed by epsilon-Keggin-Type Polyoxometalates with Binding Metal Ions, H-11.4[ZnMo12O40Zn2](1.5-) and H-7.5[Mn0.2Mo12O40Mn2](2.1-)
Two new epsilon-Keggin-type polyoxometalate-based 3D frameworks, Na1.5H11.4[epsilon-(ZnMo10.9Mo1.1O40)-Mo-II-Mo-V-O-VI{Zn-II}(2)] and (NH4)(2).H-1(7.5)[epsilon-(Mn0.2Mo6Mo6O40)-Mo-II-Mo-V-O-VI{Mn-II}(2)], are prepared, and their structures are determined by powder X-ray diffraction, Fourier transform infrared, Raman spectroscopy, and elemental analysis. epsilon-Keggin-type polyoxomolybdate units, [epsilon-ZnMo12O40] and [epsilon-Mn0.2Mo12O40], are linked with Zn2+ and Mn2+, respectively, in a tetrahedral fashion to form 3D frameworks. They show zeolite-like ion-exchange properties and redox properties. The epsilon-Keggin-based 3D framework shows high chemical composition diversity and can incorporate different elements in the framework.