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    A New Strategy for Photo-Electrochemical Reduction of Carbon Dioxide Using a Carbazole-BODIPY Based Metal-Free Catalyst
    (Wiley-V C H Verlag Gmbh, 2024) Ozdemir, Mucahit; Ulucay, Sude; Altinisik, Sinem; Koksoy, Baybars; Yalcin, Bahattin; Koyuncu, Sermet
    In this study, a cross-linked boron dipyrromethene (BODIPY) photocatalyst containing a carbazole donor group designed for photoelectrocatalytic carbon dioxide (CO2) reduction is synthesized and characterized. The BODIPY-based system, coated onto a platinum surface, is evaluated for its electrochemical and photocatalytic performance under light illumination. Cyclic voltammetry (CV) and chronoamperometry measurements reveals enhanced photocurrent responses, confirming the catalyst's ability to effectively drive CO2 reduction. Gas chromatography/mass spectrometry (GC-MS) analysis identifies the formation of ethanol (C2H5OH) as a major reaction product, showing that its yield increased with extended reaction times. Additionally, the photocatalyst demonstrates remarkable performance with significantly increasing turnover numbers (TON) and turnover frequencies (TOF) over time, indicating stable and sustained catalytic activity. With a Faradaic efficiency of 34.79% at a potential of -1.15 V, this BODIPY system exhibits both high activity and long-term stability. The combination of efficient electron transfer and visible light absorption by the carbazole-BODIPY donor-acceptor structure positions this system as a highly promising candidate for sustainable CO2 conversion applications.
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    Öğe
    Photophysical and photochemical properties and comparison of tolyl and tosyl coumarin-bearing phthalocyanines
    (Elsevier, 2023) Kazancicok, Zehra; Guler, Hatice Esar; Ozdemir, Mucahit; Piskin, Mehmet; Bulut, Mustafa; Yalcin, Bahattin; Salan, Umit
    In this study, peripheral and non-peripherally substituted Zn(II) phthalocyanine complexes were synthe-sized from 7-hydroxy-3-(p-tolyl)coumarin and 7-hydroxy-3-(p-tosyl)coumarin compounds. The synthe-sized new compounds were characterized using elemental analysis, FT-IR, UV-Vis, Fluorescence 1 HNMR spectroscopy and MALDI-TOF mass spectrometry. All the synthesized phthalocyanine complexes showed good solubility in organic solvents such as acetone, dichloromethane, chloroform, pyridine, and ethyl acetate. Fluorescent quenching behavior was investigated using 1,4-benzoquinone and potassium io-dide as a quencher. The photophysical (fluorescent quantum yields and lifetimes) and photochemical (single oxygen and photodegradation quantum yields) properties of these new phthalocyanines were examined in dimethyl sulfoxide. Phthalocyanine complexes containing 7-hydroxy-3-(p-tolyl)coumarin had higher singlet oxygen quantum yields than phthalocyanine complexes containing 7-hydroxy-3-(p- tosyl)coumarin. Phthalocyanines to which coumarins are peripherally bound were more advantageous than their non-peripherally bound derivatives. As a result of their photophysical and photochemical prop-erties, coumarin-phthalocyanine complexes containing tolyl-/tosyl-groups can be used as photosensitiz-ing candidates in photodynamic therapy and can be developed with targeted modifications.(c) 2022 Elsevier B.V. All rights reserved.