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    Determination of photophysical, photochemical and spectroscopic properties of novel lead(II) phthalocyanines
    (Pergamon-Elsevier Science Ltd, 2020) Piskin, Mehmet; Ozturk, Omer Faruk; Odabas, Zafer
    This study presents the synthesis and characterization of novel peripheral and non-peripheral tetra-2,6-dimethoxyphenoxy substituted lead(II) phthalocyanines. They were characterized by elemental analysis, IR, UV-vis, fluorescence, H-1 NMR, C-13 NMR and MALDI-TOF mass spectroscopic techniques, as well as thermogravimetric analysis. Their spectroscopic, photophysical and photochemical properties were studied in dimethylsulfoxide and compared with the above-mentioned properties of lead(II) phthalocyanines containing different substituents reported in the literature. Novel phthalocyanines can be good candidates as photosensitizers for photocatalytic reactions because they possess properties that are important for Type II mechanics, such as low photostability, sufficient singlet oxygen production, high solubility and non-aggregation behavior in commonly known organic solvents. (C) 2020 Elsevier Ltd. All rights reserved.
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    Preparation and characterization of Co(II), Ni(II) and Cu(II) complexes of a ligand containing 1,3,4-thiadiazole groups
    (Springer, 2007) Ozturk, Omer Faruk; Cansiz, Ahmet; Koparir, Metin
    (1R,2R)-1,2-bis-(5-amino-1,3,4-thiadiazole-2-yl)ethane-1,2-diol (L) has been prepared by the reaction of thiosemicarbazide with (2R,3R)-(+)-tartaric acid (I) and phosphorous oxychloride, and its complexes with Co(II), Ni(II) and Cu(II) have been obtained. The structures of the ligand and its complexes have been established by i.r., H-1- and C-13-n.m.r. spectra, u.v.-vis-nir spectroscopy, elemental analyses, T.g.-D.t.a. and magnetic susceptibility measurements.
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    Spectroscopic and photophysicochemical properties of zinc(II) phthalocyanine substituted with benzenesulfonamide units containing schiff base
    (Ios Press, 2022) Oncul, Gulen Atiye; Ozturk, Omer Faruk; Piskin, Mehmet
    In this study, compounds (E)-4-((5-bromo-2-hydroxy-3-methoxybenzylidene)amino)-N-(pyridin-2-yl)benzenesul-fonamide 1, (E)-4-((5-bromo-2-(3,4-dicyanophenoxy)-3-methoxybenzylidene)amino)-N-(pyridin-2-yl)benzenesulfonamide 2 and, complex 2(3),9(10),16(17),23(24)-tetra-[(E)-4-((5-bromo-3-methoxy-2-(lambda(1)-oxidanyl)benzylidene)amino)-N-(pyridine-2-yl)benzenesulfonamide]phthalocyaninato zinc(II) 3 were synthesized for the first time. Their structures (1-3) were characterized by spectroscopic methods such as FTIR, H-1 NMR,C-13 NMR, UV-vis, MALDI-TOF mass spectra and elemental analysis. The spectroscopic, aggregation, photophysical and photochemical properties of zinc(II) phthalocyanine 3 in dimethyl sulfoxide were investigated and the effects on the above-mentioned properties were reported as a result of the presence of benzenesulfonamide derivatives containing different bioactive groups, in their peripheral positions. In addition, its above-mentioned properties were also reported by comparing different species with those of their substituted and/or unsubstituted counterparts. The zinc(II) phthalocyanine 3 can be a potential photosensitizer candidate in photodynamic therapy, which is an effective alternative therapy in cancer treatment, due to its good solubility in commonly known solvents and monomeric species, as well as its adequate and favorable fluorescence, singlet oxygen production and photostability.
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    Synthesis, Spectral, SEM, Antibacterial and Antifungal Activity Studies on Some Co(II), Ni(II) and Cu(II) Complexes of New Schiff Base, 4-((E)-[(2-hydroxynaphthalen-1-yl)methylidene]amino)-N-(5-methyl-1,3,4-thiadiazol-2-yl)benzenesulfonamide
    (Chemical Society of Pakistan, 2018) Ozturk, Omer Faruk
    A novel group of Co(II), Ni(II) and Cu(II) complexes of the species, [M(L)AcO(H2O)2]nH2O [n= 1,2 and 3] were synthesized by the coaction of Schiff base ligand, (LH) 4-((E)-[(2-hydroxynaphthalen-1-yl)methylidene]amino}-N-(5-methyl-1,3,4-thiadiazol-2-yl)benzenesulfonamide, derived from the concentration of 2-hydroxynaphthalene-1-carbaldehyde and sulfathiadiazole. Schiff base and its Co(II), Ni(II) and Cu(II) complexes were characterized by different spectroscopic tools (IR,1H-NMR,13C-NMR, UV, SEM, TGA, CV) and magnetic moment. Magnetic moments and Electronic spectra of the Co(II), Ni(II) and Cu(II) complexes indicate that the geometries of the metal centers are octahedral. The metal-ligand ratios of complexes are 1:1 according to the elemental analyses results. Schiff base ligand and its Co(II), Ni(II) and Cu(II) complexes were tested for their antibacterial and antifungal activities by the (MIC) method. The antimicrobial activity studies have been under taken are results and discussed. © 2018 Chemical Society of Pakistan. All Rights Reserved.
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    Synthesis, Spectral, SEM, Antibacterial and Antifungal Activity Studies on Some Co(II), Ni(II) and Cu(II) Complexes of New Schiff Base, 4-{(E)-[(2-hydroxynaphthalen-1-yl)methylidene]amino}-N-(5-methyl-1,3,4-thiadiazol-2-yl)benzenesulfonamide
    (Chem Soc Pakistan, 2018) Ozturk, Omer Faruk
    A novel group of Co(II), Ni(II) and Cu(II) complexes of the species, [M(L)AcO(H2O)(2)]nH(2)O [n= 1,2 and 3] were synthesized by the coaction of Schiff base ligand, (LH) 4-{(E)-[(2-hydroxynaphthalen-1-yl)methylidene]amino}-N-(5-methyl-1,3,4-thiadiazol-2-yl)benzenesulfonamide, derived from the concentration of 2-hydroxynaphthalene-1-carbaldehyde and sulfathiadiazole. Schiff base and its Co(II), Ni(II) and Cu(II) complexes were characterized by different spectroscopic tools (IR, H-1-NMR, C-13-NMR, UV, SEM, TGA, CV) and magnetic moment. Magnetic moments and Electronic spectra of the Co(II), Ni(II) and Cu(II) complexes indicate that the geometries of the metal centers are octahedral. The metal-ligand ratios of complexes are 1:1 according to the elemental analyses results. Schiff base ligand and its Co(II), Ni(II) and Cu(II) complexes were tested for their antibacterial and antifungal activities by the (MIC) method. The antimicrobial activity studies have been under taken are results and discussed.
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    The effect of alternative measurement and evaluation techniques on safety performance in employee training
    (Yildiz Technical Univ, 2024) Dalyan, Orkun; Dalyan, Hatice; Piskin, Mehmet; Ozturk, Omer Faruk; Canpolat, Erdal
    Occupational health and safety training constitutes an important implementation step of the proactive employee welfare, health, and safety approach. In occupational health and safety training, measurement and evaluation methods should be applied accurately, efficiently, and effectively to evaluate whether learning and behavioral goals are achieved. In this research, a survey consisting of thirty questions was applied to a sample of 140 employees to determine the effect of alternative assessment tools on safety performance in occupational health and safety training. The obtained data were analyzed using the Statistical Package for Social Sciences 22 software program for reliability and exploratory factor analysis, and the Analysis of Moment Structures and Structural Equation Model 21 software program for confirmatory factor analysis, respectively. It was determined that the average score of the experimental group subjected to hazard detection poster exams using alternative assessment tools exceeded the average score of the control group taking traditional multiple-choice exams and that the level of participation in occupational health and safety regulations had a moderate positive effect on safety performance. The importance of both compulsory occupational health and safety training for primary school graduates and customized training programs for this group was emphasized. There was a positive and significant correlation between occupational health and safety compliance and safety performance. It was strongly suggested that interventions be tailored to optimum effectiveness according to training levels and that businesses also take proactive approaches to increase compliance with occupational health and safety regulations, such as organizing incentive activities and providing ongoing occupational health and safety training. A safer workplace environment should be promoted by effectively transforming the knowledge and skills acquired in occupational health and safety training into observable behaviors.
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    The new zinc phthalocyanine having high singlet oxygen quantum yield substituted with new benzenesulfonamide derivative groups containing schiff base
    (Elsevier, 2020) Piskin, Mehmet; Canpolat, Erdal; Ozturk, Omer Faruk
    The new (E)-4-((5-bromo-2-hydroxy-3-methoxybenzylidene)amino)-N-(5-methyl-1,3,4-thiadiazol-2-yl) benzenesulfonamide 1, (E)-4-((5-bromo-2-(3,4-dicyanophenoxy)-3-methoxy benzylidene)amino)-N-(5-methyl-1,3,4-thiadiazol-2-yl)benzenesulfonamide 2 and peripheral tetrakis-(E)-4-((5-bromo-3-methoxy-2-(lambda(1)-oxidaneyl)benzylidene) amino)-N-(5-methyl-1,3,4-thiadiazol-2-yl)benzenesulfonamide substituted zinc(II) phthalocyanine 3 were been synthesized and characterized using UV-vis, FT-IR, H-1 NMR, C-13 NMR (except for 3), MALDI-TOF mass spectra and elemental analysis for the first time. The spectroscopic, photophysical and photochemical properties for the phthalocyanine 3 were been described in dimethyl sulfoxide. These properties of the phthalocyanine 3 as a photosensitizer are very useful for photodynamic therapy application and its good fluorescence properties, high singlet oxygen quantum yield and appropriate photodegradation quantum yield are very important for Type II mechanisms. It has the remarkable potential to be used as Type II photosensitizers for the treatment of cancer in photodynamic therapy with these features. (C) 2019 Elsevier B.V. All rights reserved.