Mesoporous heterogeneous santa barbara amorphous (SBA)‐15‐supported cobalt complex, as a novel nanocatalyst containing N–O chelating Schiff‐base ligand was successfully synthesized by the reaction of SBA‐15 and Cobalt(II)‐Schiff‐base complex. The Co(II)‐Schiff base complex also was prepared for the first time, by the reaction of pyridoxal 5′‐phosphate or PLP (biological active form of vitamin B6), 3‐(aminopropyl)‐triethoxysilane in methanol that complexation with CoCl2. The subsequent grafting of entitled complex to SBA‐15 afforded Co(II)‐PLP‐Schiff base/SBA‐15 mesoporous catalyst. Characterization of the product was carried out with powder X‐ray diffraction, Brunauer–Emmett–Teller nitrogen adsorption–desorption, transmission electron microscopy, scanning electron microscopy, thermogravimetric analysis, atomic absorption spectroscopy, and inductively coupled plasma, Fourier‐transform infrared spectroscopy. The results revealed the retention of the textural properties and hexagonally uniform structures of SBA‐15 during the grafting procedure. This nanocatalyst was applied successfully for one‐pot synthesis of various benzothiazole heterocycles under green conditions. This catalyst is an active, reusable, and stable nanomaterial with no leaching of metal ions to the reaction medium. It was used for the synthesis of desired benzothiazole heterocycles by the cyclo‐condensation of aryl‐aldehydes with 2‐aminothiophenol with good to excellent yields and under green conditions.

We Successfully synthesized novel silica-supported Ni (II)-PLP-ONNO Schiff base/SBA-15 complex, as a mesoporous catalyst, whose characterization was determined using X-ray diffraction analysis, Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, inductively coupled plasma-atomic emission spectroscopy, nitrogen adsorption desorption isotherms (BET-EDX) and (BET-BJH), and thermo-gravimetric analysis. As a fabricated catalyst was employed, for facile and efficient, one-pot production of various benzothiazole heterocycles by cyclocondensation reactions of 2-amionthiophenol and benzaldehyde compounds under green and mild conditions with good to excellent yields. The prepared nano catalyst can offer high stability, excellent activity, easy separation, and reusability, as well environmentally friendly, compared to its homogeneous compounds.