Browsing by Author "Kani, Ibrahim"

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Citation - WoS: 6
Citation - Scopus: 6
A Carboxylate-Bridged Mn(ii) Compound With 6-methylanthranilate/Bipy: Oxidation of Alcohols/Alkenes and Catalase-Like Activity
(Taylor & Francis Ltd, 2018) Kilic, Yalcin; Bolat, Serkan; Kani, Ibrahim
A novel manganese compound, [Mn-2((1,3)-6-CH3-2-NH2C6H4COO)(2)(bipy)(4)](ClO4)(2) (bipy=2,2-bipyridine), was synthesized and used as a catalyst precursor in the oxidation of alkenes and primary alcohols to corresponding aldehydes, ketones, and acids. The six-coordinate compound has a binuclear structure in which two Mn(II) ions adopt a syn-anti (1,3)-bridging mode with two carboxylate groups and two chelated bipy ligands. The compound exhibits good activity in the oxidation of cyclohexene to 2-cyclohexene-1-one as the major product (93% conv. in 3h, 79.3% selectivity) and of cinnamyl alcohol to cinnamaldehyde as the major product with 46% selectivity (100% conv. in 1.5h) with tert-butyl hydroperoxide (TBHP) in acetonitrile at 70 degrees C. Furthermore, the catalase-like activity of the compound was studied in different solvents (acetonitrile, methanol, Tris-HCl buffer; TOF=29,910h(-1) in Tris-HCl buffer).
Mn(ii) Complexes, [mn2(mu-R1c6h3coo) 2(r2) 4].2(clo4), (r1: Cl, Nh2, Ch3); R2: 1,10 '-phenanthroline or 2,2 '-bipyridine): Synthesis, Oxidation of Alcohols/Alkenes and Catalase Activity
(Amer Chemical Soc, 2017) Avan, Ilker; Kilic, Yalcin; Kani, Ibrahim
[Abstract Not Available]
Citation - WoS: 3
Citation - Scopus: 4
Selective Catalytic Oxidation of Alkenes Employing Homobinuclear Manganese(ii) Catalysts With Tbhp
(Pergamon-Elsevier Science Ltd, 2018) Kilic, Yalcin; Kani, Ibrahim
The two novel homobinuclear compounds [Mn-2((II,II)) (mu(1,1)-4-CH3-C6H4COO)(2)(phen)(4)](ClO4)(2) (1) and [Mn-2((II,II)) (mu(1,3)-4-CH3-C6H4COO)(2)(bipy)(4)](ClO4)(2) (2), where bipy=2,2-bipyridine and phen=1,10-phenanthroline, have been synthesized and characterized by elemental analyses and spectral methods (UV-Vis, FTIR, and X-ray). A single-crystal X-ray diffraction structure analysis of the compounds revealed that the manganese atom is octahedrally coordinated. In compound 1, the binuclear(II) structure is monodentate, bridged with one oxygen atom of carboxylate ligand in mu(1,1) mode, and each Mn(II) center is coordinated with two phen ligands. In compound 2, the binuclear(II) structure is synanti bidentate, bridged with two oxygen atoms of carboxylate ligand in mu(1,3) mode, and each Mn(II) center is coordinated with two bipy ligands. The Mn-Mn separation is 3.441 (1)angstrom and 4.450 (1)angstrom for 1 and 2, respectively. The catalytic potentials of these compounds have been tested for the oxidation reaction of various olefins (i.e., styrene, cyclohexene, ethyl benzene, 1-hexene, 1-octene). The oxidation reactions were carried out in the presence of catalytic amounts of 1 and 2 with a peroxide oxygen donor (TBHP=tert-Butyl hydroperoxide) in acetonitrile at 70 degrees C. On comparing the catalytic activities of 1 and 2, both catalysts showed good activity (similar to 100% conv. in 24 h) in the oxidation of studied alkenes, and excellent conversion was obtained for cyclohexene (similar to 100% conv. in 3 h; TON = 265 and TON = 257, respectively, for 1 and 2). (C) 2017 Elsevier Ltd. All rights reserved.