Nickel Schiff-base complexes immobilized on boehmite nanoparticles and their application in the oxidation of sulfides and oxidative coupling of thiols as novel and reusable nano organometal catalysts

Abstract

Ni-complex-boehmite was prepared in water at room temperature using commercially available materials and applied as an efficient nanocatalyst in the oxidation of sulfides and thiols.

Boehmite silica sulfuric acid: as a new acidic material and reusable heterogeneous nanocatalyst for the various organic oxidation reactions

“…The FT-IR spectrum of the boehmite nanoparticles (Spectrum a) shows two strong bands at 3086 and 3308 cm −1 , which are due to the both symmetrical and asymmetrical modes of the O-H bonds on the surface of boehmite nanoparticles [25,26]. In the FT-IR spectrum of boehmite nanoparticles (Spectrum a-c), several peaks that appear at 480, 605 and [2,6]. Also, the nitrate impurity vibration at 1650 cm −1 and the vibrations of hydrogen bands OH···OH by two strong absorption bands at 1164 and 1069 cm −1 were observed in FT-IR spectrum [2,4,6].…”

“…In continuation of our studies on the application of modified boehmite nanoparticles in organic reactions [3,6], herein, we have prepare report the boehmite silica sulfuric acid (boehmite-SSA) as a high efficient, nanoparticles and Scheme 1 Synthesis of boehmite-SSA reusable heterogeneous catalyst for some organic oxidation reactions such as oxidation of sulfides into sulfoxides and oxidative coupling of thiols into their corresponding disulfides using H 2 O 2 as oxidant at room temperature.…”

“…In the FT-IR spectrum of boehmite nanoparticles (Spectrum a-c), several peaks that appear at 480, 605 and [2,6]. Also, the nitrate impurity vibration at 1650 cm −1 and the vibrations of hydrogen bands OH···OH by two strong absorption bands at 1164 and 1069 cm −1 were observed in FT-IR spectrum [2,4,6]. In the 1072 and 770 cm −1 spectral region of the FT-IR spectra (Figure b and c), an overlap of the stretching vibration of the Si-O-Si bonds with Al-O and OH···OH stretching vibration leads to band broading [27][28][29].…”

Ni–S-methylisothiourea complexes supported on boehmite nanoparticles and their application in the synthesis of 5-substituted tetrazoles

“…In spectrum c, the existence of the grafted S-methylisothiourea groups has been proved by C=N vibration peak (1638 cm −1 ) [38]. In the all samples, the negligible weight loss below 200 °C is due to the attached hydroxyl groups or adsorbed solvent molecules on the surface of nanoparticles [24]. The TGA curve of the Ni-SMTU@boehmite shows the mass loss of the supported complex and organic functional groups as it decompose upon heating.…”

“…However, many supports such as Zeolite [3,12], MCM-41 [15], iron oxide [16], carbon nanotubes [17], graphene [18], heteropolyacids [19], ionic liquids [20] or some polymers [21] have been used as catalyst supports, which most of this supports are expensive or unstable. Also, synthesis of other nanoparticles requires inert atmosphere or high temperature for calcination or preparation [22][23][24][25]. While, boehmite nanoparticles is not air or moisture sensitive, more importance boehmite nanoparticles can be prepared in water at room temperature using available materials such as NaOH and Al(NO 3 ) 3 .9H 2 O [25].…”