Yazar "Yildiz, S. Z." seçeneğine göre listele

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    Peripherally substituted soluble nickel phthalocyanines: Synthesis, characterization, aggregation behavior and antioxidant properties
    (World Scientific Publishing Co., 2020) Yazici, S. Ç.; Kahraman, S.; Yildiz, S. Z.; Yilmaz, M. D.
    Tetra-zwitterionic-substituted nickel(II) phthalocyanine derivatives were newly synthesized starting from nonionic 2(3), 9(10), 16(17), 23(24)-tetrakis-[2-(N-((3-dimethylamino)propyl) carbamate)oxyethyl)phthalocyaninato nickel (II). The novel compounds have been characterized by a combination of UV-vis, FT-IR and mass spectroscopies and elemental analysis. The critical micelle concentrations of the prepared compounds were measured, and the antioxidant activities were analyzed with radical scavenging ability of 1, 1-diphenyl-2-picrylhydrazyl (DPPH) and with 2, 2'-azino-bis(3- ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS). The zwitterionic molecules showed aggregated spectra in the UV-vis region, and they might be good surfactant candidates for the detergent industry with their appropriate critical micelle concentration (CMC) properties in water. The compounds exhibited ABTS radical scavenging activity and thus they have antioxidant activity. © 2021 by World Scientific Publishing Co. Pte. Ltd.
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    Preparation and characterization of highly fluorescent TGA-Cdte quantum dot-hyamine 1622 additive composite
    (Bentham Science Publishers, 2020) Kudrat-E-Zahan, M.; Yildiz, S. Z.; Yazici, S. C.
    Objective: The aim of the present study was to prepare highly luminescent additive composite polymer with hyamine 1622 and Thioglycolic Acid (TGA) coated CdTe Quantum Dots (QDs). Methods: The additive nano-composite was synthesized by the colloid synthesis method for the first time. The properties like particle size, fluorescence efficiency, fluorescence imaging, self-assembling, quantum dots, encapsulation, etc. were characterized by the employing of instrumental techniques such as1H and13C NMR, Fourier Transform Infrared spectroscopy (FT-IR), BAB image analysis sys-tem spectroscopy, Atomic Force Microscopy (AFM), Transmission Electron Microscopy (TEM) and Energy Dispersive X-Ray Spectroscopy (EDS). Results: CdTe quantum dots were stabilized successfully in the solid phase by hydrophobic conversion with hyamine 1622 as the cationic surfactant. The experimental results show that the prepared composite is ideal for various applications, easily synthesized, safe, and maintain good fluorescence properties. Conclusion: The newly prepared additive nanocomposite having sharp and narrow excita-tion/emission properties is expected to be applicable in biomedical/analytical systems. ©2020 Bentham Science Publishers.