Porous silica supported Co2+-tetrachlorophthalocyanine (CoPcCl-APTES@SiO2): a novel and recyclable organic–inorganic hybrid catalyst for eco-friendly oxidation of secondary alcohols

A novel, selective and recyclable cobalt based catalyst has been synthesized by covalent grafting of Co2+-tetrachlorophthalocyanine (CoPcCl) onto porous silica functionalized with 3-aminopropyltriethoxysilane (APTES), and the resulting organic–inorganic hybrid porous material was found to be highly effective catalyst for peroxidative oxidation of secondary alcohols. The porous material was characterized by elemental analysis, diffuse reflectance UV–Visible spectroscopy, 13C CPMAS and 29Si CPMAS NMR spectroscopy, X-ray diffraction (XRD), Scanning electron microscopy (SEM), BET surface area analysis, Energy dispersive X-ray fluorescence (ED-XRF), Fourier transform Infrared (FT-IR) and Atomic absorption spectroscopy (AAS) techniques. High turnover frequency, mild reaction conditions, high selectivity for ketones, and easy recovery and reusability of the catalyst renders the present protocol highly essential to address the industrial needs and environmental concerns.