Hydrothermal synthesis, structure characterization and catalytic property of a new 1-D chain built on bi-capped Keggin type mix-valence molybdenum compound: (NH 4)[Mo VI6Mo V6O 36(As VO 4)Mo V(Mo VO)

Abstract

The synthesis and structure of a new 1-D molybdenum–arsenic compound based on the bi-capped Keggin anion [Mo VI 6Mo V 6O 36(AsO 4)(Mo VO) 2] − have been reported, and its catalytic property has been examined. The title compound was characterized by IR, TG and X-ray diffraction analysis. Single crystal X-ray diffraction shows that it crystallizes in cubic crystal system, space group Pn-3 m with cell dimension: a = 11.749(2) Å, V = 1622.0(5) Å 3, Z = 2. Its structure has a 1-D infinite chain, in which the bi-capped Keggin anions are connected by sharing one terminal oxygen atom from the caps. The compound shows a moderate styrene conversion (48%), the major product for the oxidation of styrene is benzaldehyde (85.2%).