Browsing by Author "Agirtas, M. S."

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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.
An Efficient Tio2-Supported Ruthenium (ru/Tio2) Catalyst for Electrochemical Hydrogen Generation From Aqueous Potassium Borohydride
(inst Materials Physics, 2020) Keskin, M. S.; Agirtas, M. S.; Sahin, O.; Horoz, S.
In this study, a TiO2-supported ruthenium catalyst (denoted as Ru/TiO2) was facilely synthesized by chemical reduction method without the use of any chemical reducing reagents. Using a 2 wt.% KBH4 + 1 wt.% KOH solution, hydrogen generation rate was as high as 137423.9 mL* min(-1) g(-1) at 30 C-0, and apparent activation energy was calculated as 55.48 kJ*mol(-1). Compared with similar Ru-based catalysts reported in literature, the Ru/TiO2 catalyst synthesized by chemical reduction method in this study indicates higher catalytic activity and lower apparent activation energy.
Synthesis of Novel 2-(benzhydryloxy) Phenoxy-Substituted Zinc Phthalocyanine, Third-Order Nonlinear Optical and Fluorescence Properties
(indian Acad Sciences, 2022) Solgun, D. Gungordu; Gundogdu, Y.; Kilic, H. S.; Agirtas, M. S.
In this study, firstly, 4-(2-(benzhydryloxy)phenoxy)phthalonitrile compound was synthesized. Then, a new 2, 10, 16, 24-tetrakis (2-(benzhydryloxy) phenoxy phthalocyaninato) zinc (II) complex was synthesized. The characterization of the obtained structure was investigated using spectroscopy techniques, including mass, nuclear magnetic resonance, infrared, electronic absorption spectroscopies. The nonlinear optical properties were investigated by virtue of femtosecond laser z-scan method. The aggregation-concentration relationship of zinc phthalocyanine compound, the photophysical and photochemical properties was dealt by UV-Vis spectroscopy and spectrofluorophotometer. In addition, the calculated values of the nonlinear absorption coefficient, beta ( similar to 10(-10) cm W-1), the nonlinear refraction index, n(2) (similar to 10(-)(16) cm(2) W-1) and third-order susceptibilities, chi((3)) ( similar to 10(-11) esu) for 2, 10, 16, 24-tetrakis (2-(benzhydryloxy) phenoxy phthalocyaninato) zinc (II) have been seen to be in line with literature.