Ligand functionalization as a deactivation pathway in a fac-Ir(ppy)3-mediated radical addition† †Electronic supplementary information (ESI) available. See DOI: 10.1039/c4sc03064h Click here for additional data file.

نویسندگان

  • James J. Devery III
  • James J. Douglas
  • John D. Nguyen
  • Kevin P. Cole
  • Robert A. Flowers II
  • Corey R. J. Stephenson
چکیده

Knowledge of the kinetic behavior of catalysts under synthetically relevant conditions is vital for the efficient use of compounds that mediate important transformations regardless of their composition or driving force. In particular, these data are of great importance to add perspective to the growing number of applications of photoactive transition metal complexes. Here we present kinetic, synthetic, and spectroscopic evidence of the mechanistic behavior of fac-Ir(ppy)3 in a visible lightmediated radical addition to 3-methylindole, demonstrating the instability of fac-Ir(ppy)3 under these conditions. During the reaction, rapid in situ functionalization of the photocatalyst occurs, eventually leading to deactivation. These findings demonstrate a conceivable deactivation process for catalytic single electron reactions in the presence of radicophilic ligands. Attempts to inhibit photocatalyst deactivation through structural modification provide further insight into catalyst selection for a given system of interest.

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منابع مشابه

Ligand functionalization as a deactivation pathway in a fac-Ir(ppy)3-mediated radical addition.

Knowledge of the kinetic behavior of catalysts under synthetically relevant conditions is vital for the efficient use of compounds that mediate important transformations regardless of their composition or driving force. In particular, these data are of great importance to add perspective to the growing number of applications of photoactive transition metal complexes. Here we present kinetic, sy...

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General ............................................................................................................................................S1 General Procedure A: Preparation of 3’-Phosphorylated Nucleosides .................................S1 Preparation of 3’-acetylated Nucleosides...................................................................................S8 NMR Studies .........

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Laboratory of Molecular Recognition an Zhejiang University, Hangzhou 310027, Zh ac.cn State Key Laboratory of Organometallic C Chemistry, Chinese Academy of Sciences, [email protected] Shanghai Key Laboratory of Magnetic Reson Normal University, Shanghai 200062, P. R. † Electronic supplementary information ( and experimental procedures and theor 979559 and 990983. For ESI and crystallo format s...

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عنوان ژورنال:

دوره 6  شماره 

صفحات  -

تاریخ انتشار 2015