Bekir Çetinkaya

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Formation of free radicals is not limited to normal cellular process but also occur upon exposure to certain chemicals (polycyclic aromatic hydrocarbon, cadmium, lead, etc.), cigarette smoke, radiation, and high-fat diet. Free-radical damage is an important factor in many pathological and toxicological processes. Selenium, an essential micronutrient, is a(More)
In the title compound, C23H32N4Se, was synthesized and its crystal structure was determined by single crystal X-ray diffraction. The compound crystallizes in orthorhombic system, space group Pbca, a = 10.9960(10)A, b = 14.9460(9)A, c = 27.565(5)A and Z = 2. According to X-ray crystallographic studies, the diazepine ring is observed to be in a disordered(More)
NHCarbene-Ruthenium(II) Catalyst and Carbonate via Proton Abstraction Mechanism Ismail Özdemir,† Serpil Demir,† Bekir Çetinkaya,† Christophe Gourlaouen,‡ Feliu Maseras,*,‡ Christian Bruneau,§ and Pierre H. Dixneuf*,§ Institute of Chemical Research of Catalonia (ICIQ), AV. Paı̈sos Catalans, 16, 43007 Tarragona, Spain, Departament de Quimica, UniVersitat(More)
Chitosan-ferrocene (CHIT-Fc) hybrid was synthesized through covalent modification and its electrochemical properties in immobilized form were studied by using cyclic voltammetry. The hybrid film exhibited reversible electrochemistry with a formal potential of +0.35 V (vs. Ag/AgCl) at pH 5.5. The Fc in CHIT matrix retained its electrocatalytic activity and(More)
Variously substituted benzyl bromides were employed to quaternize hexahydrobenzylimidazo[1,5-a]pyridine (A) and the resulting bromides (1-11) were evaluated for their in vitro antimicrobial activity against 10 pathogenic microorganisms: Staphylococcus aureus, Staphylococcus epidermidis, Bacillus cereus, Micrococcus luteus, Proteus vulgaris, Escherichia(More)
Cleavage reactions of [PdBr(2)(NHC)](2) with two equiv. of pyridine derivatives (L), having one or two carboxylic acid groups [L = NC(5)H(4)-2-COOH, NC(5)H(4)-3-COOH, NC(5)H(4)-4-COOH, or NC(5)H(3)-2,6-(COOH)(2) in chloroform or DMSO, respectively, afforded the monomeric mixed ligand complexes trans-[PdBr(2)(NHC)L] (1-4) which, due to deprotonation of the(More)
A biosensor based on a partially purified polyphenol oxidase (PPO) enzyme was developed by using electropolymerization of [(2,2'-bipyridine)(chloro)(p-cymene)rutenium(II)]chloride] mediator complex and 1,2-diamino benzene (DAB) on a screen printing Pt electrode (1mm diameter). The electropolymerization was carried out at +0.7V for 45min in phosphate buffer(More)
The title compound, [RuCl(2)(C(25)H(29)N(5))(C(18)H(15)P)], a transfer hydrogenation catalyst, is supported by an N,N',N''-tridentate pyridine-bridged ligand and triphenylphosphine. The Ru(II) centre is six-coordinated in a distorted octahedral arrangement, with the two Cl atoms located in the axial positions, and the pyridine (py) N atom, the two imino N(More)
In the title complex, [Pd(2)(C(11)H(8)N)(2)(C(2)H(3)O(2))(2)], each Pd(II) ion has a distorted square-planar environment, being surrounded by one C, one N and two O atoms. The Pd⋯Pd distance is 2.8721 (3) Å. In the crystal structure, the mol-ecules are linked by inter-molecular C-H⋯O inter-actions.
In the title compound, C(25)H(35)N(2) (+)·Cl(-)·H(2)O, the imidazolidine ring adopts a twisted conformation, with a pseudo-twofold axis passing through the N-C-N carbon and the opposite C-C bond. The N-C-N fragment of the imidazolidine ring shows some degree of both double- and single-bond character due to partial electron delocalization. One of the(More)