title: Synthesis of Fe3O4@SiO2@OSi(CH2)3NHRN(CH2PPh2)2PdCl2 type nanocomposite complexes: Highly efficient and magnetically-recoverable catalysts in vitamin K3 synthesis.
abstract: The synthesis of aminomethylphosphine-metal complexes have opened a new perspective to the catalytic applications of organic compounds. Magnetic Fe3O4 nano-core was synthesized using the closed quartz tube with Teflon cover and microwaved 200°C for 1h with power controlled instrument set to max. 600W. Novel nano-composite supported; Fe3O4@SiO2(CH2)3NHArN(CH2PPh2)2 and Fe3O4@SiO2(CH2)3N(CH2PPh2)2 type bis(diphenylphosphinomethyl)amino ligands and their Pd(II) complexes have been synthesized and characterized with FT-IR, SEM, EDX, TEM, UV-Visible, XRD and TG/DTA techniques. All the complexes were used as heterogeneous catalysts in the oxidation of 2-methyl naphthalene (2MN) to 2-methyl-1, 4-naphthoquinone (vitamin K3, menadione, 2MNQ) in the presence of hydrogen peroxide and acetic acid. Selectivity reached about 55-60% with a conversion of 90-96% using the nano-magnetite supported aminomethylphosphine-Pd(II) complexes. The complexes were very active in three times in the catalytic recycling experiments in five catalytic cycles.
authors.affiliation: Chemistry Department, Faculty of Science and Letters, Kahramanmaraş Sütçü İmam University, 46100 Kahramanmaraş, Turkey; Research and Development Centre for University-Industry-Public Relations, Kahramanmaraş Sütçü İmam University, 46100 Kahramanmaraş, Turkey. Electronic address: serhanurus@yahoo.co.uk.
authors.forename: Serhan
authors.initials: S
authors.lastname: Uruş
mesh_terms: D002384:Catalysis; D056831:Coordination Complexes / Q000138:chemical synthesis*; D005290:Ferric Compounds / Q000138:chemical synthesis*; D053761:Nanocomposites; D010084:Oxidation-Reduction; D012822:Silicon Dioxide / Q000138:chemical synthesis*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D024483:Vitamin K 3 / Q000138:chemical synthesis*
chemical_list: D056831:Coordination Complexes; D005290:Ferric Compounds; C000499:ferric oxide; D024483:Vitamin K 3; D012822:Silicon Dioxide
keywords: Aminophosphine; Catalyst; Fe(3)O(4); Menadione; Nano; Palladium; Phosphine; Vitamin K