A manganese molybdenum phosphate with a tunnel: hydrothermal synthesis, structure and catalytic properties of (NH3CH2CH2NH3)10H3O)3(H5O2)Na2[MnMo12O24(OH)6(PO4)4(PO3OH)4][MnMo12O24(OH)6(PO4)6(PO3OH)2] · 9H2O

Abstract

A manganese molybdenum phosphate, (NH₃CH₂CH₂NH₃)₁₀(H₃O)₃(H₅O₂)Na₂[MnMo₁₂O₂₄(OH)₆ (PO₄)₄(PO₃OH)₄][MnMo₁₂O₂₄ (OH)₆(PO₄)₆(PO₃OH)₂]·9H₂O, has been hydrothermally synthesized and structurally characterized by single crystal X-ray diffraction. The structure of this compound may be considered to be two [Mo₆O₁₂(OH)₃(PO₄)₂(HPO₄)₂]^7- units bonded together by a manganese atom, although several P–O groups are not protonated on account of coordination to a Na⁺ cation. One-dimensional tunnels were formed in the solid. A probe reaction of the oxidation of acetaldehyde with H₂O₂ using this compound as catalyst was carried out in a liquid–solid system, showing that the manganese molybdenum phosphate has high catalytic activity in the reaction.