Synthesis, crystal structure and selected properties of three new 4-propylanilinium polyoxomolybdates

Abstract

Three new polyoxomolybdates of 4-propylaniline were obtained and characterized by X-ray diffraction based crystal structure solution. Structure of compound 1: bis(4-propylanilinium) pentamolybdate was studied using powder diffraction data, while compounds 2 (tetrakis(4-propylanilinium) β−octamolybdate hydrate) and 3 (hexakis(4-propylanilinium) diacetato-octamolybdate) were studied by single crystal diffraction methods. Compound 3 belongs to a relatively rare group of Mo(VI) compounds containing acetate (CH3COO−) groups directly bonded to the Mo atom. Our results indicate an intriguing instability of some polyoxomolybdate compounds, leading to the formation of carboxylic acid containing structure blocks, when such phases are left over in reaction solutions. Thermal stability and the catalytic activity in the hydrocarbons oxidation reactions were studied for these new compounds.