Browsing by Author "Celebi, M."

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Different Peripheral Substituted Phthalocyanines: Synthesis, Characterization, Aggregation Behavior, Antioxidant and Antibacterial Activity
(Pleiades Publishing inc, 2015) Celebi, M.; Agirtas, M. S.; Dundar, A.
In this study, a novel phthalonitrile, 4-chloro-5-(2-((2-hydroxyethyl)(p-tolyl)amino)ethoxy)phthalonitrile (3), and its metallophthalocyanine derivatives (4-6) are prepared by cyclotetramerization with appropriate metal salts in dimethylformamide. The newly prepared compounds have been characterized by several spectroscopic techniques. All compounds are evaluated for their antioxidant and antibacterial potential. For the antioxidant studies, three tests are applied; DPPH (2,2-diphenyl-1-picrylhydrazylradical) scavenging, metal chelating and reducing power activity. Compound 4 exhibits the best DPPH scavenging activity as 35.2% at 100 mg/L concentration. The metal chelating activities of compounds 3 and 4 are 69.7% and 56.4%, respectively. Reducing power activities of compounds 3 and 4 are higher than alpha-tocopherol which is used as positive control. All compounds show moderate antibacterial activity when compared to the standard antibiotics, amikacin and tetracycline.
Nanocatalytic Architecture for the Selective Dehydrogenation of Formic Acid
(wiley, 2021) Baguc, I.B.; Kanberoglu, G.S.; Yurderi, M.; Bulut, A.; Celebi, M.; Kaya, M.; Zahmakiran, M.
Formic acid (HCOOH) is a main by-product formed through many biomass processes and has recently been proposed as one of the most promising liquid organic hydrogen carrier material in the chemical hydrogen storage for the fuel cell applications. However, efficient hydrogen (H2) generation through catalytic formic acid dehydrogenation under mild thermodynamic conditions constitutes a major challenge because poisoning of active metal center exists in catalytic systems with carbon monoxide (CO) formed as an intermediate. In this chapter, we focus on the research advances on the formic acid dehydrogenation in the presence of different nanocatalysts including monometallic, bimetallic, and trimetallic nanoparticles in the form of alloy, core@shell, and physical mixture. The main advantages and drawbacks of these systems are presented by comparing their catalytic performances depending on additives, solvents, and temperature parameters. Additionally, the morphology, structure, and composition of these nanocatalysts as well as their synthesis protocols are discussed, and new synthesis strategies are proposed to enhance the catalytic performance of nanocatalysts in the formic acid dehydrogenation. © 2021 WILEY-VCH GmbH, Boschstr. 12, 69469 Weinheim, Germany.