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M. Nilüfer Yarasir - One of the best experts on this subject based on the ideXlab platform.
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Novel biologically active Metallophthalocyanines as promising antioxidant-antibacterial agents: Synthesis, characterization and computational properties
Journal of Molecular Structure, 2020Co-Authors: Armağan Günsel, Abdullah Kobyaoglu, Ahmet T. Bilgicli, Burak Tuzun, Busra Tosun, Gulnur Arabaci, M. Nilüfer YarasirAbstract:Abstract This study reports on the synthesis and characterization of non-peripherally tetrasubstituted zinc(II), copper(II) and cobalt(II) phthalocyanines with 4-(trifluoromethylthio)phenoxy substituents. Synthesized compounds were characterized by FT-IR, 1H NMR, MALDI mass, elemental analysis and UV–Vis spectroscopic methods. By using some parameters obtained from quantum chemical calculations, the activity of the studied ligand (1) against metal atoms was investigated. Based on the obtained results, the NMR, IR and UV–Vis spectra of the ligand (1) in different phases were compared with experimental results. Also, theorical and experimental UV–Vis spectrum values of Metallophthalocyanines (2–4) were investigated. Additionally, the possible use of all synthesized Metallophthalocyanines for antioxidant and antibacterial agents were investigated. The obtained results showed that CoPc (4) had very good antioxidant activities among others. Although all of the tested Metallophthalocyanines (2–4) had some antibacterial activities, ZnPc (2) had the best antibacterial effect against five different bacteria among other Metallophthalocyanines tested.
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Synthesis of tetra-substituted Metallophthalocyanines: Spectral, structural, computational studies and investigation of their photophysical and photochemical properties
Polyhedron, 2019Co-Authors: Emre Güzel, Ahmet T. Bilgicli, Burak Tuzun, Armağan Günsel, Göknur Yaşa Atmaca, Ali Erdoğmuş, M. Nilüfer YarasirAbstract:Abstract This work presents the synthesis of peripherally and non-peripherally tetra-substituted Metallophthalocyanines (6–14) containing the 2-(3,4-dimethoxyphenyl)ethanol group. The synthesized compounds were characterized by standard spectroscopy methods. The ligands of the Metallophthalocyanines were investigated by quantum chemical calculations. The quantum chemical parameters of these ligands (1 and 2) such as the HOMO, LUMO and chemical hardness were calculated by the B3lyp, HF and M062x methods. The ΔG value of the metal complexes of the ligands were calculated with the obtained results. In addition, photophysical (fluorescence quantum yields) and photochemical (singlet oxygen generation and photodegradation under light irradiation) properties of newly synthesized phthalocyanines were investigated in DMSO solutions, comparatively.
Nathan S. Lewis - One of the best experts on this subject based on the ideXlab platform.
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detection of organic vapors and nh3 g using thin film carbon black Metallophthalocyanine composite chemiresistors
Sensors and Actuators B-chemical, 2008Co-Authors: Stephen Maldonado, Edgardo Garciaberrios, Marc D Woodka, Bruce S Brunschwig, Nathan S. LewisAbstract:Thin-film chemiresistive vapor sensors have been fabricated using composites of carbon black (CB) and Metallophthalocyanines. The resulting sensors exhibited large, rapid, and reversible relative differential resistance changes upon exposure to a series of test organic vapors. The individual sensor responses, and collective sensor array properties for classification of a series of test organic vapors, were comparable to those of chemiresistor arrays made from composites of conductors and insulating organic polymers. In addition to displaying resistance responses to volatile organic compounds, the CB/Metallophthalocyanine composite sensors exhibited a high sensitivity towards trace levels of NH_3(g) under ambient temperature and pressure conditions. No degradation in sensor response was observed after nearly 12 h of repeated exposure to 30 parts per million of NH_3(g) in air. Chemiresistors formed from composites of CB and zinc phthalocyanines demonstrated responses that were comparable to those of commercial NH_3(g) sensors. The CB/Metallophthalocyanine composites thus broaden the types of materials that can be used for this type of low-power chemiresistive gas sensing, and broaden the types of analytes that can be sensitively detected to include inorganic gases as well as organic vapors.
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Detection of organic vapors and NH3(g) using thin-film carbon black–Metallophthalocyanine composite chemiresistors
Sensors and Actuators B-chemical, 2008Co-Authors: Stephen Maldonado, Edgardo García-berríos, Marc D Woodka, Bruce S Brunschwig, Nathan S. LewisAbstract:Thin-film chemiresistive vapor sensors have been fabricated using composites of carbon black (CB) and Metallophthalocyanines. The resulting sensors exhibited large, rapid, and reversible relative differential resistance changes upon exposure to a series of test organic vapors. The individual sensor responses, and collective sensor array properties for classification of a series of test organic vapors, were comparable to those of chemiresistor arrays made from composites of conductors and insulating organic polymers. In addition to displaying resistance responses to volatile organic compounds, the CB/Metallophthalocyanine composite sensors exhibited a high sensitivity towards trace levels of NH_3(g) under ambient temperature and pressure conditions. No degradation in sensor response was observed after nearly 12 h of repeated exposure to 30 parts per million of NH_3(g) in air. Chemiresistors formed from composites of CB and zinc phthalocyanines demonstrated responses that were comparable to those of commercial NH_3(g) sensors. The CB/Metallophthalocyanine composites thus broaden the types of materials that can be used for this type of low-power chemiresistive gas sensing, and broaden the types of analytes that can be sensitively detected to include inorganic gases as well as organic vapors.
David E. Bergbreiter - One of the best experts on this subject based on the ideXlab platform.
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polyolefin soluble polyisobutylene oligomer bound Metallophthalocyanine and azo dye additives
Journal of Polymer Science Part A, 2014Co-Authors: Nilusha Priyadarshani, Chase W. Benzine, Benjamin Cassidy, Jakkrit Suriboot, Peng Liu, Hung-jue Sue, David E. BergbreiterAbstract:Metallophthalocyanines prepared with polyisobutyl (PIB) substituents have very high solubility in organic solvents including saturated hydrocarbons, toluene, and other low polarity organic solvents. In heptane, PIB-bound Metallophthalocyanines have solubility of about 0.1 g/mL at 25 °C, solubility values that are significantly higher than other substituted Metallophthalocyanines. PIB terminally functionalized with Metallophthalocyanines as well as PIB containing terminal azo dye groups also dissolve in molten hydrocarbon polymers like polyethylene or polypropylene. Thus, these highly chromogenic PIB-bound dyes can be incorporated uniformly into the polyolefins to form colored polymer solids on cooling. Because only a low concentration of a highly hydrocarbon compatible dye is used, the crystallinity and thermal properties of the colored polyolefin products are not significantly affected. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 545–551
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Polyolefin soluble polyisobutylene oligomer‐bound Metallophthalocyanine and azo dye additives
Journal of Polymer Science Part A: Polymer Chemistry, 2013Co-Authors: Nilusha Priyadarshani, Chase W. Benzine, Benjamin Cassidy, Jakkrit Suriboot, Peng Liu, Hung-jue Sue, David E. BergbreiterAbstract:Metallophthalocyanines prepared with polyisobutyl (PIB) substituents have very high solubility in organic solvents including saturated hydrocarbons, toluene, and other low polarity organic solvents. In heptane, PIB-bound Metallophthalocyanines have solubility of about 0.1 g/mL at 25 °C, solubility values that are significantly higher than other substituted Metallophthalocyanines. PIB terminally functionalized with Metallophthalocyanines as well as PIB containing terminal azo dye groups also dissolve in molten hydrocarbon polymers like polyethylene or polypropylene. Thus, these highly chromogenic PIB-bound dyes can be incorporated uniformly into the polyolefins to form colored polymer solids on cooling. Because only a low concentration of a highly hydrocarbon compatible dye is used, the crystallinity and thermal properties of the colored polyolefin products are not significantly affected. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 545–551
Bouchta Sahraoui - One of the best experts on this subject based on the ideXlab platform.
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impact of annealing process on stacking orientations and second order nonlinear optical properties of Metallophthalocyanine thin films and nanostructures
Dyes and Pigments, 2014Co-Authors: Alicja Zawadzka, P Plociennik, Andrzej Korcala, J. Strzelecki, Abdul Kariem Arof, Bouchta SahraouiAbstract:Abstract The paper presents the second order nonlinear optical properties of Cu, Co, Mg and Zn metallophtalocyanines thin films. The films were fabricated by physical vapor deposition in high vacuum onto fused silica glass substrates. In order to investigate both optical and structural properties an annealing process in an ambient atmosphere for 12 h at temperatures equal to either 150 °C or 250 °C applied after the fabrication process. Atomic force microscopy images were obtained for an observation of the structural property changes. The thickness of the thin films was in the range from 80 nm to 120 nm. The size and shape of the forming nanostructures were different for different Metallophthalocyanines and depended on the phase of the material. As-deposited sample of copper phthalocyanine formed the smallest nanostructures – standing columns with 100 nm of the height and 40 nm of the diameter. Annealed sample formed the largest nanostructures – lying cuboids with dimensions: 10 × 1000 × 40 nm. The second harmonic generation measurements have been carried out in order to investigate the second order nonlinear optical properties and their dependence on the structure of the thin films after the annealing process. Moreover the fittings based on the two models have been carried out in order to understand deeper the origin of the experimental findings. It was found that the annealing process can significantly modify both the structural and the second order nonlinear optical properties of the Metallophthalocyanine thin films.
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Optical properties of Metallophthalocyanine compounds thin films
2012 14th International Conference on Transparent Optical Networks (ICTON), 2012Co-Authors: Alicja Zawadzka, Andrzej Korcala, J. Strzelecki, P. Płóciennik, Z. Łukasiak, K. Bartkiewicz, Bouchta SahraouiAbstract:This work contains investigation results of the linear and nonlinear optical properties of Metallophthalocyanines (Cu, Co, Zn, and Mg) and Metallophthalocyanine chlorides (Al, Ga) thin films which were grown by physical vapor deposition (PVD) technique in high vacuum on transparent (quartz) and semiconductor (silica) substrates. Spectral properties of these films were examined using transmission, SGH and THG technique. Structural properties were investigated by AFM measurements. Transmission spectra were shown a large influence of intermolecular interaction on spectral properties of Metallophthalocyanines and Metallophthalocyanine chlorides. The influence of films thickness and annealing process of samples on their optical properties were also determined. The thickness dependence was connected with morphology of the film while annealing was caused change in polymorph phase. The measurements of transmission, SHG and THG spectra were allowed to determine optical constant of these films.
Ritwick Das - One of the best experts on this subject based on the ideXlab platform.
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phase dependent ultrafast third order optical nonlinearities in Metallophthalocyanine thin films
Journal of Applied Physics, 2016Co-Authors: Samir Kumar, K Anil V Kumar, S M Dharmaprakash, Ritwick DasAbstract:We present a comprehensive study on the impact of phase transformations of Metallophthalocyanine thin films on their third-order nonlinear optical (NLO) properties. The Metallophthalocyanine thin films are prepared by thermally evaporating the commercially available Copper(II)2,9,16,23-Tetra-tert-butyl-29H,31H-phthalocyanine (CuPc) and Zinc(II) 2,9,16,23-Tetra-tert-butyl-29H,31H-phthalocyanine (ZnPc) powder on glass substrate. Thermal annealing causes a phase transformation which has a distinct signature in powder X-ray diffraction and UV-Vis-NIR spectroscopy. The NLO characteristics which include nonlinear refractive index n2, as well as nonlinear absorption coefficient (βeff), were measured by using a single beam Z-scan technique. An ultrashort pulsed fiber laser emitting femtosecond pulses (Δτ ≈ 250 fs) at 1064 nm central wavelength is used as a source for the Z-scan experiment. The βeff values in as prepared thin films were ascertained to be smaller as compared to the annealed one due to the smaller v...