Zhang, Minchao and Zhang, Wangqing (2008) Pd nanoparticles immobilized on pH-responsive and chelating nanospheres as an efficient and recyclable catalyst for Suzuki reaction in water. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (16). pp. 6245-6252.
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Official URL: http://dx.doi.org/10.1021/jp7121517
The pH-responsive and chelating core-shell nanospheres of polystyrene-co-poly[2-methacrylic acid 3-bis(carboxymethylamino)-2-hydroxypropyl ester] (PS-co-PGMA-IDA), which contain a PS core and a pH-responsive and chelating shell of PGMA-IDA, are synthesized by one-stage soap-free emulsion polymerization and used as scaffold to synthesize Pd nanoparticles embedded in the shell layer of the core-shell nanospheres. This catalyst of shell-embedded Pd nanoparticles is highly dispersed in aqueous medium at pH range from 3 to 11 just like a homogeneous catalyst and can be separated and reused like a heterogeneous one by adjusting pH value of the aqueous medium. The Suzuki reaction performed in water demonstrates that the shell-embedded Pd catalyst is an efficient and easily reusable one. Compared with the Pd catalyst of nanoparticles immobilized on the core layer of core-shell microspheres, the present shell-embedded Pd catalyst is more efficient possibly due to easier access to the active sites of the Pd nanoparticles immobilized on the outer shell of the core-shell nanospheres.
|Subjects:||Material Science > Functional and hybrid materials|
Material Science > Nanochemistry
|Deposited By:||Anuj Seth|
|Deposited On:||09 Dec 2008 12:35|
|Last Modified:||20 Jan 2009 09:42|
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