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    Optical and morphological properties and in silico studies on metallophthalocyanines containing pyridyloxy moieties
    (Elsevier, 2020) Sorar, Idris; Ozcesmeci, Ibrahim; Katirci, Ramazan; Gul, Ahmet
    Metallophthalocyanines (M = zinc (II) and cobalt (II)) containing four 4-pyridyloxy -terminal groups were prepared by cyclotetramerization of 4-(4-pyridyloxy)phthalonitrile. The optimized geometry, electronic properties (chemical hardness, electron affinity, electronegativity), linear and nonlinear optical features of the phthalocyanine derivatives were investigated using density functional theory (DFT). The energy of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) were calculated. The excitation features of electrons in the ultraviolet-visible (UV) region were computed with time-dependent density functional theory (TD-DFT). Thin films of these metallophthalocyanines which have low solubility in organic solvents have been prepared by spin coating after solution preparation by both magnetic stirring and ultrasonic treatment. Results showed that ultrasonic treatment increased the solubility of the compounds and better thin films were obtained. (C) 2020 Elsevier B.V. All rights reserved.
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    Optical and Morphological Properties of New Metallophthalocyanines with Hydroxyethylsulfanyl Substituents
    (Maik Nauka/Interperiodica/Springer, 2019) Sorar, Idris; Ozcevneei, Ibrahim; Gul, Ahmet
    Metallophthalocyanine complexes (M = Pd, FeCl, VO, or MnCl) bearing four hydroxyl-terminated aliphatic groups were prepared by cyclotetramerization 4-(hydroxyethylsulfanyl)phthalonitrile. Aggregation tendencies of these phthalocyanines were investigated in varying concentrations from 4 x 10(-5) to 8 x 10(-6) M in DMF. Spin coating method was used to prepare thin films of metallophthalocyanines substituted with four hydroxyethylsulfanyl groups. The optical properties of the films were investigated as a function of the different metal ions in the inner core, with the transmittance spectrum measured at a wavelength range of 200-1000 nm. The results show that different metal ions in the inner core clearly change the transmittance values of the thin films of metallophthalocyanine. Morphological results also show that surface of the metallophthalocyanines has changed considerably according to the nature of the metal ion.
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    Optical studies on phthalocyanines substituted with phenylazonaphthoxy groups
    (Taylor & Francis Ltd, 2016) Ozcesmeci, Ibrahim; Sorar, Idris; Gul, Ahmet
    The synthesis and characterization of peripherally ({1-[(Z or E)-phenylazo]-2-naphthyl} oxy) tetra-substituted metal-free and metallo (Zn(II), Co(II) and Cu(II)) phthalocyanines are described in this study. Aggregation properties of these compounds were investigated in the concentration range of 20-1M in tetrahydrofuran. Spectroscopic and photophysical properties of these phthalocyanines have been investigated in tetrahydrofuran. Thin films of metallophthalocyanines were prepared by spin coating technique. Results show that transmittance values of the films change with respect to the metal ions in the visible and Q absorptions regions. Films were also annealed at 100, 200 and 300 degrees C and their optical properties were investigated as a function of annealing temperature. The spectrophotometric measurements of transmittance spectra were carried out in the wavelength range 200-1000nm. Results showed that transmittance values of ZnPc thin films were increased as a result of heat treatment.
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    Zinc(II)phthalocyanine as an optical window for visible region
    (Elsevier Science Bv, 2011) Ozcesmeci, Ibrahim; Sorar, Idris; Gul, Ahmet
    Zinc(II)phthalocyanine with four naphthoxy pendant groups on the periphery was prepared by cyclotetramerization of 4-(2-naphthoxy)phthalonitrile. Thin films of this material have been prepared from solutions of different concentrations (5-100 mg ZnPc in 1 mL THF) by spin coating technique. Optical transmittance of thin films was measured using a spectrophotometer in the wavelength range of 2601100 nm. Results show that transmittance is decreased with the increasing concentration in the ranges corresponding to B and Q absorptions, but the films can still be proposed as optical windows between these regions (-400-600 nm) due to very low absorbances. The surface morphology of the thin films was investigated by atomic force microscopy, AFM, and showed that all of the films have nano volcanic holes, except the film prepared from the most concentrated solution (100 mg ZnPc in 1 mL THF). (C) 2011 Elsevier B.V. All rights reserved.