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Mesoporous Transition Metal Aluminosilicas: Incorporation of Alkylphenothiazines and Their Photoionization

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Magnetic Resonance in Colloid and Interface Science

Part of the book series: NATO Science Series ((NAII,volume 76))

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Abstract

Photoionization of N-alkylphenothiazines in mesoporous Me-A1MCM-41 containing ion-exchanged transition metal ions Me = Ni(II), Fe(III) and Cu(II) was investigated. N-alkylphenothiazine cation radicals (PCn +) are produced by 320 nm light at room temperature and characterized by electron spin resonance and ultraviolet-visible diffuse reflectance spectroscopy. Me-A1MCM- 41 materials are shown to be efficient heterogeneous hosts for the photoinduced formation of long-lived PCn cation radicals indicating efficient photoinduced charge separation. Ni-A1MCM-41 shows the highest photoionization efficiency compared to Fe-A1MCM-41 and Cu-A1MCM-41. The photoionization efficiency depends on the metal ion type and concentration ion-exchanged into mesoporous Me-A1MCM-41 molecular sieves. Also, as the alkylphenothiazine alkyl chain length increases from methyl to hexadecyl, the photoionization yield decreases.

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Authors and Affiliations

  1. Department of Chemistry, University of Houston, Houston, Texas, 77204-5003, USA

    Sunsanee Sinlapadech & Larry Kevan

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  1. Sunsanee Sinlapadech
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  2. Larry Kevan
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Editors and Affiliations

  1. Laboratoire de Chimie des Surfaces, Université Pierre et Marie Curie, Paris, France

    Jacques Fraissard

  2. Russian Academy of Sciences, Boreskov Institute of Catalysis, Novosibirsk, Russia

    Olga Lapina

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Sinlapadech, S., Kevan, L. (2002). Mesoporous Transition Metal Aluminosilicas: Incorporation of Alkylphenothiazines and Their Photoionization. In: Fraissard, J., Lapina, O. (eds) Magnetic Resonance in Colloid and Interface Science. NATO Science Series, vol 76. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0534-0_39

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  • DOI: https://doi.org/10.1007/978-94-010-0534-0_39

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-1-4020-0787-3

  • Online ISBN: 978-94-010-0534-0

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