Abstract
A pure inorganic 2-D framework based on paradodecatungstate polyanions and [Mn(H2O)n]2+ (n = 2, 3) ions, Na10{[Mn(H2O)3]2[H2W12O42]}{[Mn(H2O)3]2[Mn(H2O)4][H2W12O42]}·56H2O (1), has been synthesized and characterized by IR spectra, UV–vis spectra, thermogravimetric analysis (TGA), single-crystal X-ray diffraction, and magnetic measurements. Single-crystal X-ray diffraction analysis indicates that [H2W12O42]10− in 1 is a tetradentate ligand and coordinates to four [(Mn(H2O)3]2+ cations through terminal oxygens to form manganese doubly bridged 1-D chains, which are further linked through [Mn(H2O)4]2+ ions into a 2-D layer. The catalytic activities of 1 are tested in the selective oxidation of benzyl alcohol to benzaldehyde with 30% aqueous H2O2 as oxidant in toluene, exhibiting 90% conversion and 93% selectivity. Magnetic studies indicate that weak antiferromagnetic couplings exist between the Mn(II) ions in 1.
Graphical abstract
The pure inorganic–inorganic hybrid represents an extended structure constructed from paradodecatungstate and transition metal ions and shows definite catalytic activities on the probe reaction of benzyl alcohol oxidation to benzaldehyde with H2O2.
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Disclosure statement
No potential conflict of interest was reported by the authors.