Architectured Fe3Pd2(OH)(2)[picolinic acid](8)(H2O)(4) Hybrid Nanorods: A Remarkably Reusable and Robust Heterogeneous Catalyst for Suzuki-Miyaura and Mizoroki-Heck Cross-Coupling Reactions

摘要

Pd/Fe-catalyzed Mizoroki-Heck and Suzuki-Miyaura cross-coupling reactions are among the important C-C bond-forming reactions. In the present work, new approaches were evaluated systematically for preparing heterogeneous Pd based catalysts with high activities. For the first time architectured organic-inorganic Fe3Pd2(OH)(2)[PA](8)(H2O)(4) hybrid nanorods were reported. They were fabricated by solvothermal reaction of K2PdC14 with picolinic acid (PA) (chelating agent) in the presence of Fe(NO3)(2) and an excess amount of base. This reaction produces isostructural coordination complex ligands containing palladium coordinate to Fe-OH chains. As-prepared Fe3Pd2(OH)(2)[PA](8)(H2O)(4) hybrid nanorods are a promising new catalyst candidate for Suzuki-Miyaura and Mizoroki-Heck cross-coupling reactions. Usually, the catalytic activity with Pd based catalysts was characterized by reaction times, catalyst usage, and reusability of the catalyst. The Fe3Pd2(OH)(2)[PA](8)(H2O)(4) catalyst demonstrates excellent catalytic activity for Suzuki-Miyaura and Mizoroki-Heck reactions, with remarkable yield of over 81.3% and 96.5%, respectively, under only 0.197 mol % Pd + Fe loading. Interestingly, the Fe3Pd2(OH)(2)[PA](8)(H2O)(4) catalyst easily recovered from the reaction mixture and recycled 30 times without any significant loss in its catalytic activity. This study may provide new perspectives for the catalytic reactions of Suzuki-Miyaura and Mizoroki-Heck cross-coupling reactions catalyzed by heterogeneous catalysts.