Preparation and characterization of functionalized Cu(II) Schiff base complex on mesoporous MCM-41 and its application as effective catalyst for the oxidation of sulfides and oxidative coupling of thiols

Abstract

An efficient and highly selective heterogeneous catalyst was prepared via immobilization of Cu(II) Schiff base complex on mesporous MCM-41. The Schiff base complex has been derived from 3,4-dihydroxybenzaldehyde and 3-amino propyl triethoxysilan, which is chemically anchored on the surface of MCM-41. Finally, resulting ligand was reacted with copper nitrate to produce Cu(II) Schiff base complex-MCM-41. Finally, resulting ligand was reacted with copper nitrate to produce Cu(II) Schiff base complex-MCM-41. The mesoporous catalyst has been characterized by fourier transform infrared spectroscopy, transmission electron microscopy, small angle X-ray diffraction, thermal gravimetric analysis, and N 2 adsorption-desorption study. This heterogeneous catalyst showed excellent catalytic efficiency in the oxidation of various sulfides and thioles in the presence of urea hydrogen peroxide as oxidant and could be reused for at least 4 cycles without significant loss in activity.

Synthesis and characterization of Ni and Zn Schiff base complexes supported on modified MCM-41 as reusable catalysts for various oxidation reactions

“…In continuation of our studies on the application of new heterogeneous systems in organic reactions [9,[18][19][20]. herein we report synthesis and characterization of Ni or Zn Schiff base complexes immobilized onto MCM-41.…”

Pd(0)‐ S‐propyl‐2‐aminobenzothioate immobilized onto functionalized magnetic nanoporous MCM‐41 as efficient and recyclable nanocatalyst for the Suzuki, Stille and Heck cross coupling reactions

“…Because this type of supports can be used as efficiently bridge and fill the gap between homogeneous and heterogeneous catalysts . More recently, the consolidation of functionalized mesoporous silica materials with magnetic nanoparticles (MNPs), within a single material to develop novel porous magnetic nanostructure which have the advantages and properties of both mesoporous Silica (thermal and mechanical stability, large pore Volume and high surface area for catalyst loading) and magnetic nanoparticles (simple in synthesis, fast separation, low cost, high surface area and low toxicity), is undoubtedly of great interest for practical applications such as catalytic applications, magnetic storage and recording, for sensors, environmental, and biomedical applications . Therefore owing to the context of reuse of palladium, Herein we report synthesis and spectroscopic characterization of a Pd‐SPATB complex supported on functionalized magnetic nanostructured MCM‐41 (Fe 3 O 4 @MCM‐41@Pd‐SPATB), which has been applied as a novel and efficient nano‐organometallic catalyst with excellent catalytic activity and selectivity in Carbon–carbon coupling reactions in PEG‐400 as green solvent.…”

Anchoring of Cu(II)–vanillin Schiff base complex on MCM‐41: A highly efficient and recyclable catalyst for synthesis of sulfides and 5‐substituted 1H–tetrazoles and oxidation of sulfides to sulfoxides

“…The mesoporosity of silica‐based materials has come to the forefront as an exciting and novel research field of scientific and technological importance in heterogeneous catalysis . Among the mesoporous silica materials, MCM‐41 is of interest due to some of its special properties such as its high thermal stability, high surface area, high pore volume, structural simplicity, narrow pore size distribution and ease of preparation with negligible pore networking and pore blocking . Vanillin has been reported to inhibit mutagenesis induced by chemical and physical mutagens and to suppress the invasion and migration of cancer cells.…”