Abstract
In this research, magnetite nano-particles as the core are fabricated by co-precipitation method from Fe(II) and Fe(III) chloride salts and then the surfaces of the nano-particles are modified to improve their performance. These modifications include the coating of silica and then the second layer by 3-amino propyl triethoxy silane (APTES) which causes the functionalization of magnetite nanoparticles with –NH2 groups. In the next step, an aliphatic tetra-dentate N2O2 Schiff base was synthesized by condensation reaction between benzoyl acetone and ethylenediamine. Then this Schiff base is immobilized on the magnetite silica surfaces. This immobilized Schiff base was converted to the Ni (II) Schiff base complex by the reaction with Ni(II) acetate tetrahydrate. This Ni (II) Schiff base complex is immobilized on magnetite silica and shown as Fe3O4@SiO2/Schiff base of Ni (II). This cor-shell nano-structure is fully characterized by techniques such as FT-IR, VSM, XRD, FE-SEM, EDX, TGA-DTA, AAS, BET, and BJH. In the last step, this nano-catalyst is used as an efficient catalyst for the solvent-free synthesis of amido alkyl naphthols by the condensation reaction between an aldehyde, 2-naphthol, and an amide. The reaction was monitored by TLC. At the end of the reaction, the nano-catalyst was removed easily from the reaction mixture by an external magnet. The products of amido alkyl naphthols were identified by FT-IR and 1HNMR techniques. Finally, the percentage yield of the reaction is calculated by measuring the mass of 1-amidoalkyl-2-naphthol synthesized in the presence of the catalyst.
A manganese(iii) Schiff base complex immobilized on silica-coated magnetic nanoparticles showing enhanced electrochemical catalytic performance toward sulfide and alkene oxidation
