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Aromatic Carbonyl and Nitro Compounds as Photosensitizers and Their Photophysical Properties in the Tropospheric Aqueous Phase

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Download Hi-Res ImageDownload to MS-PowerPointCite This:J. Phys. Chem. A 2021, 125, 23, 5078-5095
    A: Aerosols; Environmental and Atmospheric Chemistry; Astrochemistry

    Aromatic Carbonyl and Nitro Compounds as Photosensitizers and Their Photophysical Properties in the Tropospheric Aqueous Phase
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    • Tamara Felber
      Tamara Felber
      Leibniz Institute for Tropospheric Research (TROPOS), Atmospheric Chemistry Department (ACD), Permoserstrasse 15, 04318 Leipzig, Germany
      More by Tamara Felber
    • Thomas Schaefer
      Thomas Schaefer
      Leibniz Institute for Tropospheric Research (TROPOS), Atmospheric Chemistry Department (ACD), Permoserstrasse 15, 04318 Leipzig, Germany
      More by Thomas Schaefer
    • Lin He
      Lin He
      Leibniz Institute for Tropospheric Research (TROPOS), Atmospheric Chemistry Department (ACD), Permoserstrasse 15, 04318 Leipzig, Germany
      More by Lin He
    • Hartmut Herrmann*
      Hartmut Herrmann
      Leibniz Institute for Tropospheric Research (TROPOS), Atmospheric Chemistry Department (ACD), Permoserstrasse 15, 04318 Leipzig, Germany
      *Phone: +49 341 2717 7024; fax: +49 341 2717 99 7024; E-mail: [email protected]
      More by Hartmut Herrmann
      Orcidhttps://orcid.org/0000-0001-7044-2101
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    The Journal of Physical Chemistry A

    Cite this: J. Phys. Chem. A 2021, 125, 23, 5078–5095
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    https://doi.org/10.1021/acs.jpca.1c03503
    Published June 7, 2021
    Copyright © 2021 American Chemical Society
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    Abstract

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    Secondary organic aerosol formation in the atmospheric aqueous/particulate phase by photosensitized reactions is currently subject to uncertainties. To understand the impact of photosensitized reactions, photophysical and -chemical properties of photosensitizers, kinetic data, and reaction mechanisms of these processes are required. The photophysical properties of acetophenones, benzaldehydes, benzophenones, and naphthalenes were investigated in aqueous solution using laser flash excitation. Quantum yields of excited photosensitizers were determined giving values between 0.06–0.80 at 298 K and pH = 5. Molar absorption coefficients (εmax(3PS*) = (0.8–13) × 104 L mol–1 cm–1), decay rate constants in water (k1st = (9.4 ± 0.5) × 102 to (2.2 ± 0.1) × 105 s–1), and quenching rate constants with oxygen (kq(O2) = (1.7 ± 0.1–4.4 ± 0.4) × 109 L mol–1 s–1) of the excited triplet states were determined at 298 K and pH = 5. Photosensitized reactions of carboxylic acids and alkenes show second-order rate constants in the range of (37 ± 7.0–0.55 ± 0.1) × 104 and (27 ± 5.0–0.04 ± 0.01) × 108 L mol–1 s–1. The results show that different compound classes act differently as a photosensitizer and can be a sink for certain organic compounds in the atmospheric aqueous phase.

    Copyright © 2021 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.jpca.1c03503.

    • Materials, mathematical derivation of the quantum yield, credibility model of the quantum yield, triplet energy calculation method, UV–vis spectra of the ground-state photosensitizers, time-resolved transient absorbance and emission spectra, values of the molar absorption coefficients of the excited triplet states, absorbance–time traces and Stern–Volmer plots of the quenching reaction of the excited triplet-state photosensitizers with oxygen, description of box model studies of the impact of ionic strength on photosensitized processes as well as of the impact of competing oxidants on the conversion of organic compounds (PDF)

    • Values of the molar absorption coefficients (XLSX)

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    The Journal of Physical Chemistry A

    Cite this: J. Phys. Chem. A 2021, 125, 23, 5078–5095
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.jpca.1c03503
    Published June 7, 2021
    Copyright © 2021 American Chemical Society
    Request reuse permissions

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