Browsing by Author "Aǧirtaş, Mehmet Salih"

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Interaction Activity of Metal-Free Phthalocyanine Compound Bearing Tetra -(2-(N-2'-Cyanoethyl)aminoethylsulfanyl) Units with DNA
(Chemical Society of Pakistan, 2025) Arslantaş, Ali; Aǧirtaş, Mehmet Salih
The phthalocyanine having 4-(2-(N-2'-cyanoethyl)aminoethylsulfanyl) group had been reported earlier in the literature. In this current studying, DNA binding activity of 1Pc phthalocyanine bearing 4-(2-(N-2'-cyanoethyl)aminoethylsulfanyl units was examined spectroscopically via elctronic absoption, fluorescence titration, melting point profile, electrophoresis and viscosity methods. The interaction activity of 1Pc compound was examined at differing concentrations. UV/Vis spectrometer, viscosity, fluorescence spectroscopy and thermal melting temperature confirmed that 1Pc binds to the DNA. The Kb of 1Pc is also estimated via UV/Vis titration and Kb of 1Pc was computed as 2.1394 x 106 M-1. The Kb value demonstrated that 1Pc reacts with DNA by an intercalative mechanism. Alongside this research, the mechanism by which the compound binds to DNA was investigated by determining Tm. The Tm of DNA + 1Pc complex was identified as 74.31. This data confirmed that 1Pc binds to DNA intercalatively. All the results obtained from the used methods demonstrated that 1Pc phthalocyanine compound has an efficient DNA interaction activity and 1Pc phthalocyanine compound interacts with DNA via an intercalative mechanism. As a result, the compound may be a therapeutic agent due to its DNA interaction property. © 2025 Elsevier B.V., All rights reserved.
Photovoltaic Enhancement Using Green-Synthesized AgNPs and Phthalocyanine in DSSCs
(Springer, 2025) Ödemiş, Ömer; Gungordu Solgun, Derya; Özkartal, Abdullah; Aǧirtaş, Mehmet Salih
This study aims to improve the photovoltaic properties of phthalacyanines by additives that can be used as DSSC to produce economical materials for renewable energy. Therefore, silver nanoparticles (AgNPs) were successfully synthesized by green chemistry method using green husk of walnut (GHW). Additionally, a new axial silicon phthalocyanine was synthesized. The phytocomponent AgNPs were doped with our newly synthesized phthalocyanine and applied in dye-sensitized solar cells (DSSC) as a sensitizer. The power conversion efficiency of the prepared DSSC was investigated. The formation of AgNPs was confirmed by optical absorption at wavelength between 350 and 540 nm. XRD data confirmed that the average crystallite size of AgNPs was 46.17 nm. FTIR analyses identified the bio-components potentially responsible for silver nanoparticle formation. TEM analysis shows that there are nanoparticles with an average size of 36.15 nm. The success of environmentally friendly green synthesized AgNPs to activate the sensitizer in DSSCs indicates that silver nanoparticles can be effectively used in such applications. The conversion efficiency of the axial phthalocyanine compound was measured as 2.05. However, as a result of doping the phthalocyanine compound with AgNPs, it was measured as 2.63 and 2.81 at 1:1 and 1:2 ratios, respectively. This clearly reveals the effect of AgNPs. © 2025 Elsevier B.V., All rights reserved.
Synthesis of Biomass-Supported Nanocomposites From Black Cumin Pulp and Their Use as Catalysts in NaBH4 Hydrolysis
(Springer, 2025) Keskin, Mehmet Salih; Aǧirtaş, Mehmet Salih
Co-Cu-Zn-B/black cumin meal(bcm) nanocomposites were synthesized by chemical degradation and deposition method. The structure and morphology of Co-Cu-Zn-B/bcm, which was synthesized at room conditions and active in sodium borohydride hydrolysis, were characterized by SEM, EDS, XRD devices. To prepare the waste black cumin meal as a support material, it was first kept in an autoclave at 180 °C in the oven for 6 h. In this stage, binary and ternary Co-Cu-B/bcm, Co-Zn-B/bcm and Co-Cu-Zn-B/bcm samples and different metal ratios (10–60%) NaBH4 hydrolysis experimental results were tested. In terms of production from NaBH4 hydrolysis of the synthesized nanocomposites, it has been observed that the best results are exhibited in those produced with 50% metal ratio and binary metal components Co-Cu-B/bcm, where catalytic activities occur. Co-Cu-B/bcm > Co-Cu-Zn-B/bcm > Co-Zn-B/bcm Maximum energy production rate in terms of catalytic activity and completion time of parts is 1757.1 mL/g.cat at 30 °C it was detected as min. The effects of variables such as NaOH and NaBH4 compositions in solution, a certain limit and temperature on NaBH4 hydrolysis were tested separately. The kinetics of the combined products were examined between temperatures (20–50 °C) and then the activation energy was calculated as 37.67 kJ/mol. The activation energy and temperature range obtained show that the catalyst has good activity compared to expensive catalysts. © 2025 Elsevier B.V., All rights reserved.