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Dual Roles of Polyhydroxy Matrices in the Homocoupling of Arylboronic Acids Catalyzed by Gold Nanoclusters under Acidic Conditions

Authors

  • Raghu Nath Dhital,

    1. Department of Functional Molecular Science, Graduate University of Advanced Studies (SOKENDAI), Myodaiji, Okazaki 444-8787 (Japan)
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  • Dr. Arumugum Murugadoss,

    1. Research Center for Molecular Scale Nanoscience, Institute for Molecular Science, Myodaiji, Okazaki 444-8787 (Japan), Fax: (+81) 564-595527
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  • Prof. Dr. Hidehiro Sakurai

    Corresponding author
    1. Research Center for Molecular Scale Nanoscience, Institute for Molecular Science, Myodaiji, Okazaki 444-8787 (Japan), Fax: (+81) 564-595527
    2. Department of Functional Molecular Science, Graduate University of Advanced Studies (SOKENDAI), Myodaiji, Okazaki 444-8787 (Japan)
    • Research Center for Molecular Scale Nanoscience, Institute for Molecular Science, Myodaiji, Okazaki 444-8787 (Japan), Fax: (+81) 564-595527

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Abstract

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Polyhydroxy biopolymers play dual roles in the stabilization of gold clusters as well as the activation of arylboronic acids through reversible binding. In acidic pH (4.57), the electronic state of boron is changed into that observed at pH 9 in the vicinity of Au/chit or Au/starch, which favors the transmetalation process; this change is why homocoupling product was observed even in acidic solutions.

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