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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
    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.