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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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    Novel bis-ball-type double-decker phthalocyanines containing symmetric di-schiff base derivatives: Synthesis, spectroscopy, and photophysicochemical properties
    (Elsevier, 2025) Mutlu, Fatih; Ozturk, Omer Faruk; Piskin, Mehmet
    In this study, novel symmetric bis(oxy)-diphthalonitrile derivatives carrying di-Schiff base groups were designed and synthesized for various applications, including pharmaceuticals and photocatalysis. The compounds, 4,4 '((((1E, 1 ' E)-(1,4-phenylenebis(azanilylidene) bis(methanylylidene) bis(6-methoxy-2,1-phenylene))bis(oxy))diphthalonitrile) (2), and their ball-type bis-metal-free (3) and lutetium(III) phthalocyanine complex derivatives (4), were characterized by elemental analysis, FTIR, 1H NMR, 13C NMR, MALDI-TOF MS, and UV-vis spectroscopy (for bis-ball-type double-decker phthalocyanines 3 and 4). The solubility and aggregation behaviors of 2 and 3, containing electron donor and acceptor groups in the symmetric di-Schiff base framework, were studied in various solvents: polar protic, aprotic, borderline polar aprotic, and non-polar. These bis-ball-type doubledecker phthalocyanine derivatives exhibited high solubility without aggregation in all solvents studied, except hexane for 3 and 4, and water and toluene for 3. To assess their potential as photosensitizers for photocatalytic applications, their photophysical properties in DMSO and photochemical properties in DMSO and DMF were investigated. These bis-ball-type double-decker phthalocyanine derivatives exhibited absorption bands with high molar extinction coefficients in the therapeutic window, along with low but sufficient fluorescence quantum yields, lifetimes, and intersystem crossing probabilities. They also displayed adequate singlet oxygen production and high photostability. These photophysical and chemical properties make them promising candidates for various photocatalytic applications, including biological and biomedical imaging.
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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 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.