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Recyclable Polymer‐Supported Nanometal Catalysts in Water
Author(s) -
Ohtaka Atsushi
Publication year - 2013
Publication title -
the chemical record
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.61
H-Index - 78
eISSN - 1528-0691
pISSN - 1527-8999
DOI - 10.1002/tcr.201300001
Subject(s) - polystyrene , catalysis , sonogashira coupling , polymer , polymer chemistry , thermal decomposition , decomposition , nanoparticle , materials science , chemical engineering , chemistry , palladium , organic chemistry , nanotechnology , engineering
Abstract Two types of polymer‐supported nanometal catalysts with high catalytic activity and recyclability in water have been developed. One catalyst was composed of linear polystyrene‐stabilized metal nanoparticles ( PS ‐MtNPs). A palladium catalyst ( PS ‐ PdONPs ) was prepared in water by the thermal decomposition of P d( OAc ) 2 in the presence of polystyrene. The degree of immobilization of P d, but not the size of the P d nanoparticles, was dependent on the molecular weight and cross‐linking of the polystyrene. The PS ‐ PdONPs exhibited high catalytic activity for S uzuki, H eck, and Sonogashira coupling reactions in water and they could be recycled without loss of activity. Linear polystyrene was also suitable as a stabilizer for in situ generated PdNPs and PtNPs . The second catalyst was a polyion complex that was composed of poly[4‐chloromethylstyrene‐ co ‐(4‐vinylbenzyl)tributylammonium chloride] and poly(acrylic acid)‐stabilized PdNPs ( PIC ‐ PdNPs ). Aggregation and redispersion of PIC ‐ PdNPs were easily controlled by adjusting the pH value of the solution.