Yazar "Al-Raqa, Shaya Y." seçeneğine göre listele

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    Efficient singlet oxygen generation by triptycene substituted A3B type zinc(II) phthalocyanine photosensitizers
    (Pergamon-Elsevier Science Ltd, 2016) Al-Sohaimi, Bandar R.; Piskin, Mehmet; Ghanem, Bader S.; Al-Raqa, Shaya Y.; Durmus, Mahmut
    A(3)B type unsymmetrical 8,11,15,18,22,25-hexadecyl-2,3-(9,10-diocty1-6,7-dimethoxy-2,3-dioxytriptycene) (11) and 8,11,15,18,22,25-hexadecyl-2,3-(9,10-diundecy1-6,7-dimethoxy-2,3-dioxytriptycene) (12) zinc(II) phthalocyanines were synthesized for the first time. Their photophysical and photochemical properties were investigated as solutions in toluene and obtained values were compared with unsubstituted zinc(II) phthalocyanine for determination of substitution effect. Both newly synthesized phthalocyanines showed high singlet oxygen generation making them good candidates as photosensitizers for photocatalytic-reactions. (C) 2015 Elsevier Ltd. All rights reserved.
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    Öğe
    Enhancing photophysical and photochemical properties of zinc(II) phthalocyanine dyes by substitution of triptycene moieties
    (Elsevier, 2016) Al-Sohaimi, Bander Roshadan; Piskin, Mehmet; Aljuhani, Ateyatallah; Al-Raqa, Shaya Y.; Durmus, Mahmut
    The symmetrical zinc(II) phthalocyanines conjugated with 9,10-dioctyl-6,7-dimethoxy-2,3-dioxytriptycene or 9,10-diundecyl-6,7-dimethoxy-2,3-dioxytriptycene moieties were synthesized in this study. These novel phthalocyanines were characterized by standard characterization techniques such as 1HNMR, FT-IR, UV-vis, Mass and Elemental Analysis. All these phthalocyanines showed highly solubility and formed non-aggregated monomeric species in most of the organic solvents. Their photochemical properties such as singlet oxygen, and photodegradation quantum yields, and photophysical properties including fluorescence quantum yields and lifetimes were investigated in toluene. The fluorescence quenching behavior of the studied zinc(II) phthalocyanines by the addition of 1,4-benzoquinone were also described in toluene. (C) 2016 Elsevier B.V. All rights reserved.
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    Öğe
    Synthesis, photophysical and photochemical properties of novel phthalocyanines substituted with triptycene moieties
    (Pergamon-Elsevier Science Ltd, 2015) Ghanem, Bader S.; Piskin, Mehmet; Durmus, Mahmut; El-Khouly, Mohamed E.; Al-Raqa, Shaya Y.
    New metal-free and zinc(II) phthalocyanines containing four triptycene moieties were synthesized and characterized by H-1 NMR, mass, IR, electronic spectroscopies and elemental analysis as well. The steady-state absorption spectra of the investigated compounds exhibited the main absorption bands in the visible region, at around 700 nm. The fluorescence spectra and quantum yields were recorded by steady-state emission measurements. The powerful nanosecond laser flash photolysis technique was employed to record the transient absorption spectra of the long-lived triplet states of the investigated compounds. The singlet oxygen generation and photodegradation properties of the target phthalocyanines under light irradiation were also investigated in tetrahydrofuran solution. (C) 2015 Elsevier Ltd. All rights reserved.