Synthesis, characterisation and catalytic activity of non-crystalline organic-inorganic hybrid material comprising Keggin-type manganese(II)-substituted phosphotungstate and salen

A new inorganic-organic hybrid material comprising Keggin-type mono manganese-substituted phosphotungstate and salen was synthesised. The synthesised hybrid material was systematically characterised by various physicochemical techniques such as elemental analysis, thermal gravimetric analysis, FT-IR, UV-vis, electron spin resonane, H-1 NMR, C-13 MAS NMR and P-31 NMR. The catalytic activity was evaluated for non-solvent liquid phase oxidation of styrene using O-2. The novelty of the present work lies in obtaining 42% conversion with 41% selectivity for styrene oxide with O-2 under solvent-free mild reaction conditions only in 4 h.