Browsing by Author "Demiç, S"

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    Synthesis of imidazole derivatives and their immobilization to wool fabric to impart antibacterial properties
    Akca, C; Gürgen, NM; Ates, M; Demiç, S
    The increasing awareness of health and hygiene issues, coupled with epidemics and rising living standards, has fueled a growing interest and demand for antibacterial textiles. While various chemicals are utilized in the production of antibacterial textiles, metal salts and nano metal particles, particularly silver compounds, are also commonly employed. Silver salts, due to their ionic structure, often result in a rapid release of silver in water, leading to a short-term, high antibacterial effect. In contrast, N-heterocyclic carbene (NHC) complexes offer a unique advantage by providing long-term, high antibacterial activity through the gradual release of silver ions. This is facilitated by the bond formed between wool and NH2 groups, rendering the fabric resistant to light. In this study, we conducted the synthesis of N-heterocyclic carbene (NHC) complexes and successfully immobilized these compounds onto wool fabric. The outcome of this research is the production of antibacterial wool fabrics exhibiting prolonged high antibacterial activity even after 50 washing cycles, while remaining resistant to light. Notably, N-heterocyclic carbene (NHC) complexes, commonly used in pharmacology, have not been explored for imparting antibacterial properties to wool fiber prior to this study. The study is original in this aspect.
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    Synthesis and Spectroscopic Properties of a Novel Perylenediimide Derivative
    Hakli-Birel, Ö; Dinçalp, H; Zafer, C; Demiç, S; Colladet, K; Vanderzande, D; Yürüm, Y; Içli, S
    A novel symmetric 3,4,9,10-perylenetetracarboxylic acid derivative (PDI1) dye based on thiophene donor group was synthesized and characterized by FT-IR and H-1 NMR. Cyclic Voltammetry analysis is performed to determine the energy levels of the perylene derivative. Optical characteristics were determined by visible absorption and fluorescence emission spectra. Spectral behavior and fluorescence quantum yield of PDI1 have been measured in different solvents. The dye exhibits high fluorescence quantum yield (Phi(f): 0.94-0.99). But the quantum yield PDI1 is very low in the n-butanol solution (Phi(f): 0.12). The photophysical properties have important implications for use in a variety of electroactive and photovoltaic applications. A photovoltaic device was fabricated with PDI1 as transporting material. The conversion efficiency for DSSC sensitized by PDI1 is 0.0065%. PDI1 exhibits electrochromic behavior by switching between neutral (red) and oxidized (blue) states. Electron transfer capacity of PDI to the TiO2 was investigated by incorporation of dye as sensitizer in dye sensitized solar cell (DSSC). Soluble dye molecules are very important to prepare dye sensitized solar cell. Solubility was increased with thiophene group.