Catalytic Oxidation of Benzyl Alcohol Using Nanosized Cu/Ni Schiff-Base Complexes and Their Metal Oxide Nanoparticles
by
Sameerah I. Al-Saeedi 1, Laila H. Abdel-Rahman 2,*, Ahmed M. Abu-Dief 2, Shimaa M. Abdel-Fatah 2, Tawfiq M. Alotaibi 3, Ali M. Alsalme 4 and Ayman Nafady 4,*
Sameerah I. Al-Saeedi 1, Laila H. Abdel-Rahman 2,*, Ahmed M. Abu-Dief 2, Shimaa M. Abdel-Fatah 2, Tawfiq M. Alotaibi 3, Ali M. Alsalme 4 and Ayman Nafady 4,*
1
Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, Riyadh 11451, Saudi Arabia
2
Chemistry Department, Faculty of Science, Sohag University, Sohag 82534, Egypt
3
King Abdullah City for Atomic and Renewable Energy, Riyadh 11451, Saudi Arabia
4
Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
*
Authors to whom correspondence should be addressed.
Catalysts 2018, 8(10), 452; https://doi.org/10.3390/catal8100452
Received: 26 September 2018 / Revised: 7 October 2018 / Accepted: 10 October 2018 / Published: 13 October 2018
(This article belongs to the Section Nanostructured Catalysts)
In this work, nanosized Cu and Ni Schiff-base complexes, namely ahpvCu, ahpnbCu, and ahpvNi, incorporating imine ligands derived from the condensation of 2-amino-3-hydroxypyridine, with either 3-methoxysalicylaldehyde (ahpv) or 4-nitrobenzaldehyde (ahpnb), were synthesized using sonochemical approach. The structure and properties of the new ligands and their complexes with Ni(II) and Cu(II) were determined via infrared (IR), nuclear magnetic resonance (NMR), electronic spectra (UV-Vis), elemental analysis (CHN), thermal gravimetric analysis (TGA), molar conductivity (Λm), and magnetic moment (μeff). The combined results revealed the formation of 1:1 (metal: ligand) complexes for ahpvCu and ahpvNi and 1:2 for ahpnbCu. Additionally, CuO and NiO nanoparticles were prepared by calcination of the respective nanosized Cu/Ni complexes at 500 °C, and characterized by powder X-ray diffraction (XRD) and transmission electron microscopy (TEM). Significantly, the as-prepared nanosized Schiff-base Cu/Ni complexes and their oxides showed remarkable catalytic activity towards the selective oxidation of benzyl alcohol (BzOH) in aqueous H2O2/ dimethylsulfoxide (DMSO) solution. Thus, catalytic oxidation of BzOH to benzaldehyde (BzH) using both ahpvCu complex and CuO nanoparticles in H2O2/DMSO media at 70 °C for 2 h yielded 94% and 98% BzH, respectively, with 100% selectivity.
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Keywords:
Schiff-base Cu(II) and Ni(II) complexes; metal oxides; nanoparticles; sonochemical; catalytic activity; benzyl alcohol
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MDPI and ACS Style
Al-Saeedi, S.I.; Abdel-Rahman, L.H.; Abu-Dief, A.M.; Abdel-Fatah, S.M.; Alotaibi, T.M.; Alsalme, A.M.; Nafady, A. Catalytic Oxidation of Benzyl Alcohol Using Nanosized Cu/Ni Schiff-Base Complexes and Their Metal Oxide Nanoparticles. Catalysts 2018, 8, 452.
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