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    Electrochemical, Spectroelectrochemical, and Electrocatalytic Dioxygen Reducing Properties of Peripheral Tetra-2,6-dimethoxyphenoxy Substituted Phthalocyanines
    (John Wiley and Sons Inc, 2021) Orman, Efe Baturhan; Pişkin, Mehmet; Odabaş, Zafer; Özkaya, Ali Rıza
    By using of peripherally tetrakis-2,6-dimethoxyphenoxy substituted Co(II), Fe(III), and Mn(III) phthalocyanines was observed to extend the redox richness of the phthalocyanine ring with the addition of reversible metal-based electron transfer couples to the phthalocyanine ring-based electron transfer processes in solution. The emergence of highly steady anionic and cationic redox species with clear spectral and colour changes both in solution and in the film during in situ spectroelectrochemical and in situ electrocolorimetric measurements pointed out their applicability as electrochromic materials. Furthermore, the phthalocyanine complexes demonstrated strong interaction with dioxygen and thus, high electrocatalytic enforcement for its reduction.
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    Öğe
    Newly Soluble and Non-Aggregated Copper(II) and Tin(II) Phthalocyanines: Synthesis, Characterization and Investigation of Photophysical and Photochemical-Responsive
    (2017) Pişkin, Mehmet; Öztürk, Ömer Faruk; Odabaş, Zafer
    This work presents the synthesis and characterization of non-aggregated and highly soluble copper(II) and tin(II) phthalocyaninessubstituted with 2,6-dimethoxyphenoxy groups at the non-peripheral (alpha) and peripheral (beta) positions. The phthalocyanines havebeen characterized by common spectroscopic techniques. They show excellent solubility and non-aggregated species in common organicsolvents such as dimethylsulfoxide, dimethylformamide, tetrahydrofuran, toluene, acetonitrile, chloroform and dichloromethane, whichmake them candidates to use for many applications in different fields of science and technology. The effects positions of substituenton the phthalocyanine skeleton and the variety of central metal ions on the phthalocyanine of aggregation and on their spectroscopicproperties were determined in different solvents as mentioned above. The novel synthesized copper phthalocyanines were not evaluatedfor fluorescence, photophysical and photochemical properties due to transition metal and paramagnetic behavior of central metalin the phthalocyanine cavity. The effects of substituent and their positions on the tin(II) phthalocyanines’ on their photophysical(fluorescence quantum yields and lifetimes) and photochemical properties (singlet oxygen generation and photodegradation underlight irradiation) were also investigated and reported in dimethylsulfoxide for the first time.
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    Öğe
    Synthesis and Spectroscopic Properties of Newly Tetrapyrazinoporphyrazine Containing Gadolinium(III) Acetate
    (2023) Pişkin, Mehmet; Odabaş, Zafer; Durmuş, Mahmut
    A new tetrakis-(2-methylpyrazino)porphyrazinato gadolinium(III) acetate complex was synthesized. Elemental analysis, Fourier-Transform Infrared, Ultraviolet-visible, and fluorescence spectroscopy techniques clarified its structure. It can dissolve very well without aggregation in both Dimethyl sulfoxide and N, N-Dimethylformamide, which have high dielectric constant and high dipole moment from polar aprotic solvent type. Its aggregation property was also investigated in dimethyl sulfoxide at different concentrations, and it was determined to contain monomeric species. In addition, its fluorescence properties were investigated in Dimethyl sulfoxide and the effect of gadolinium(III) acetate metal ion as a heavy rare earth element was determined. According to the findings in this study, it may be used as an electronic and optical material and in various technological applications such as photocatalytic applications. In addition, these findings may be useful for systems that include changes in pyrazinoporphyrazine-like forms.
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    Öğe
    Synthesis, spectroscopy, and photophysical properties of newly magnesium (II) phthalocyanine
    (2021) Pişkin, Mehmet Burçin; Öztürk, Ömer; Odabaş, Zafer
    2(3),9(10),16(17),23(24)-tetrakis-2,6-dimethoxyphenoxy substituted magnesium (II) phthalocyanine, which has very good solubility in polar and non-polar solvents and does not aggregate, was synthesized. Its structure was characterized by spectroscopic methods such as elemental analysis, UV-vis, FT-IR, MALDI-TOF mass and 1H NMR. It has very good solubility in polar aprotic solvents such as dimethyl sulfoxide, N, N- Dimethylformamide, tetrahydrofuran, dichloromethane, and non-polar solvents such as toluene, chloroform. Its aggregation properties have been studied both in the solvents mentioned above and in N, N- Dimethylformamide at different concentrations. Its photophysical properties were determined in N, N-dimethyl formamide. The effects of the nature and presence of 2,6-dimethoxyphenoxy group, which is an antioxidant derivative, on the phthalocyanine skeleton on the spectroscopic and photophysical properties were investigated by comparing it with unsubstituted magnesium (II) phthalocyanine. It can be a good nominee for various technological applications in that it does not aggregate and has good solubility in polar and non-polar solvents, as well as better and favorable fluorescence properties than its analog in the previous study.