Two hydrogen-bond-cross-linked molybdenum (VI) network polymers: Synthesis, crystal structures and cyclooctene epoxidation with H < inf> 2 O < inf> 2

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Two molybdenum (VI) hydrogen-bonded network polymers [MoO2F4]·(4,4′-H2bpd)(H2O)2 (1) and [MoO2Cl3(H2O)]·(4,4′-H2bpd)Cl (2) (bpd = bipiperidine) have been synthesized and examined as catalysts for epoxidation of cyclooctene. Complexes of the Mo compounds containing the bpd ligand are prepared and characterized by infrared spectroscopy, thermogravimetric and elemental analyses. They have been structurally characterized by single crystal X-ray diffraction analysis. The structures of both the complexes are shown to be comprised of molybdenum and two protonated N-ligand cations that have resulted in a cross-linked hydrogen-bonded network structure. These complexes are applicable as catalysts for the cis-cyclooctene epoxidation reactions with hydrogen peroxide as a source of oxygen and NaHCO3 as a cocatalyst. It has been observed that the formation of the oxidant peroxymonocarbonate ion, HCO4- by hydrogen peroxide and bicarbonate enhances the epoxidation reaction. Both the complexes have exhibited a good activity and a very high selectivity for the formation of cyclooctene oxide. © 2009 Springer Science+Business Media, LLC.

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Structural Chemistry