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  1. Article ; Online: Correction to "Radicals as Exceptional Electron-Withdrawing Groups: Nucleophilic Aromatic Substitution of Halophenols Via Homolysis-Enabled Electronic Activation".

    Shin, Nick Y / Tsui, Elaine / Reinhold, Adam / Scholes, Gregory D / Bird, Matthew J / Knowles, Robert R

    Journal of the American Chemical Society

    2024  Volume 146, Issue 3, Page(s) 2286–2287

    Language English
    Publishing date 2024-01-08
    Publishing country United States
    Document type Published Erratum
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/jacs.3c13005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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  2. Article ; Online: Singly Reduced Iridium Chromophores: Synthesis, Characterization, and Photochemistry.

    Baek, Yunjung / Reinhold, Adam / Tian, Lei / Jeffrey, Philip D / Scholes, Gregory D / Knowles, Robert R

    Journal of the American Chemical Society

    2023  Volume 145, Issue 23, Page(s) 12499–12508

    Abstract: One-electron reduced photosensitizers have been invoked as crucial intermediates in photoredox catalysis, including multiphoton excitation and electrophotocatalytic processes. However, such reduced chromophores have been less investigated, limiting ... ...

    Abstract One-electron reduced photosensitizers have been invoked as crucial intermediates in photoredox catalysis, including multiphoton excitation and electrophotocatalytic processes. However, such reduced chromophores have been less investigated, limiting mechanistic studies of their associated electron transfer processes. Here, we report a total of 11 different examples of isolable singly reduced iridium chromophores. Chemical reduction of a cyclometalated iridium complex with potassium graphite affords a 19-electron species. Structural and spectroscopic characterizations reveal a ligand-centered reduction product. The reduced chromophore absorbs a wide range of light from ultraviolet to near-infrared and exhibits photoinduced bimolecular electron transfer reactivity. These studies shed light on elusive reduced iridium chromophores in both ground and excited states, providing opportunities to investigate a commonly invoked intermediate in photoredox catalysis.
    Language English
    Publishing date 2023-06-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/jacs.2c13249
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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  3. Article ; Online: Radicals as Exceptional Electron-Withdrawing Groups: Nucleophilic Aromatic Substitution of Halophenols Via Homolysis-Enabled Electronic Activation.

    Shin, Nick Y / Tsui, Elaine / Reinhold, Adam / Scholes, Gregory D / Bird, Matthew J / Knowles, Robert R

    Journal of the American Chemical Society

    2022  Volume 144, Issue 47, Page(s) 21783–21790

    Abstract: While heteroatom-centered radicals are understood to be highly electrophilic, their ability to serve as transient electron-withdrawing groups and facilitate polar reactions at distal sites has not been extensively developed. Here, we report a new ... ...

    Abstract While heteroatom-centered radicals are understood to be highly electrophilic, their ability to serve as transient electron-withdrawing groups and facilitate polar reactions at distal sites has not been extensively developed. Here, we report a new strategy for the electronic activation of halophenols, wherein generation of a phenoxyl radical via formal homolysis of the aryl O-H bond enables direct nucleophilic aromatic substitution of the halide with carboxylate nucleophiles under mild conditions. Pulse radiolysis and transient absorption studies reveal that the neutral oxygen radical (O
    MeSH term(s) Electrons ; Electronics ; Carboxylic Acids ; Phenol ; Reactive Oxygen Species
    Chemical Substances Carboxylic Acids ; Phenol (339NCG44TV) ; Reactive Oxygen Species
    Language English
    Publishing date 2022-11-17
    Publishing country United States
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/jacs.2c10296
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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  4. Article ; Online: Elucidating the mechanism of photochemical CO

    Cohen, Kailyn Y / Reinhold, Adam / Evans, Rebecca / Lee, Tia S / Kuo, Hsin-Ya / Nedd, Delaan G / Scholes, Gregory D / Bocarsly, Andrew B

    Dalton transactions (Cambridge, England : 2003)

    2022  Volume 51, Issue 45, Page(s) 17203–17215

    Abstract: The complex, [{[Mn(bpy)(CO) ...

    Abstract The complex, [{[Mn(bpy)(CO)
    Language English
    Publishing date 2022-11-21
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472887-4
    ISSN 1477-9234 ; 1364-5447 ; 0300-9246 ; 1477-9226
    ISSN (online) 1477-9234 ; 1364-5447
    ISSN 0300-9246 ; 1477-9226
    DOI 10.1039/d2dt02506j
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Morphological Requirements for Nanoscale Electric Field Buildup in a Bulk Heterojunction Solar Cell.

    Schwarz, Kyra N / Mitchell, Valerie D / Khan, Saeed-Uz-Zaman / Lee, Calvin / Reinhold, Adam / Smith, Trevor A / Ghiggino, Kenneth P / Jones, David J / Rand, Barry P / Scholes, Gregory D

    The journal of physical chemistry letters

    2020  Volume 12, Issue 1, Page(s) 537–545

    Abstract: The morphology of organic semiconductors is critical to their function in optoelectronic devices and is particularly crucial in the donor-acceptor mixture that comprises the bulk heterojunction of organic solar cells. Here, energy landscapes can play ... ...

    Abstract The morphology of organic semiconductors is critical to their function in optoelectronic devices and is particularly crucial in the donor-acceptor mixture that comprises the bulk heterojunction of organic solar cells. Here, energy landscapes can play integral roles in charge photogeneration, and recently have been shown to drive the accumulation of charge carriers away from the interface, resulting in the buildup of large nanoscale electric fields, much like a capacitor. In this work we combine morphological and spectroscopic data to outline the requirements for this interdomain charge accumulation, finding that this effect is driven by a three-phase morphology that creates an energetic cascade for charge carriers. By adjusting annealing conditions, we show that domain purity, but not size, is critical for an electro-absorption feature to grow-in. This demonstrates that the energy landscape around the interface shapes the movement of charges and that pure domains are required for charge carrier buildup that results in reduced recombination and large interdomain nanoscale electric fields.
    Language English
    Publishing date 2020-12-30
    Publishing country United States
    Document type Journal Article
    ISSN 1948-7185
    ISSN (online) 1948-7185
    DOI 10.1021/acs.jpclett.0c03425
    Database MEDical Literature Analysis and Retrieval System OnLINE

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