Nickel(II) Schiff base complex supported on nano‐titanium dioxide: A novel straightforward route for preparation of supported Schiff base complexes applying 2,4‐toluenediisocyanate

Abstract

For the first time, a novel, straightforward and inexpensive route for immobilization of metals in Schiff base complex form is reported applying 2,4‐toluenediisocyanate as a precursor of primary amine group. A nickel(II) Schiff base complex supported on nano‐TiO2 was designed and synthesized as an effective heterogeneous nanocatalyst for organic reactions, and well characterized using various techniques such as Fourier transform infrared spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, X‐ray diffraction, energy‐dispersive X‐ray analysis and thermogravimetric analysis. The catalytic efficiency of the complex was evaluated in selective oxidation of sulfide to sulfoxide by hydrogen peroxide as an oxidant under solvent‐free conditions at room temperature, which successfully resulted in high yield and high conversion of products. Effective factors including solvent type, oxidant and catalyst amount were also optimized. The catalyst shows outstanding reusability and could be impressively recovered for six consecutive cycles without significant change of its catalytic efficiency.

Titania supported dioxidotungsten(vi) complex as bio-mimic for the type II copper-containing oxidase enzyme phenoxazinone synthase

“…26,36 Further, such TiO 2supported metal complexes based catalysts are recyclable and reusable. [37][38][39][40][41][42] Additionally, the kinetic potential of the homogeneous dioxidotungsten(VI) complex has been explored for the coupling of o-aminophenol under oxidizing conditions. This reaction has been catalysed by various complexes containing different metal centres, [43][44][45] but tungsten complexes catalysed coupling of o-aminophenol under oxidizing conditions, to the best of our knowledge, are reported here for the first time.…”

Glucose‐assisted preparation of n‐TiO2‐P25/Ag: An efficient and robust photocatalyst for enhancing visible‐light photo‐oxidation of benzyl alcohol

“…Therefore, an optimum percentage of metals on TiO 2 facilitates the photocatalytic activity. [40] Considering the above points in mind, and within the framework of our continuing efforts for design and employ novel heterogeneous nanocatalysts [41][42][43][44][45] and their extension in photocatalytic reactions, [46][47][48][49] in this study, a new way is introduced for Ag deposition on the surface of nano TiO 2 -P25. Several processes have been explored to synthesize composite with Ag nanoparticles successfully.…”