Reactive Silver and Cobalt Nanoparticles Modified with Fatty Acid Ligands Functionalized by Imidazole Derivatives

被引：30

作者：

Bromberg, Lev ^{[1
]}

Chen, Liang ^{[1
]}

Chang, Emily P. ^{[1
]}

Wang, Sa ^{[1
]}

Hatton, T. Alan ^{[1
]}

机构：

[1] MIT, Dept Chem Engn, Cambridge, MA 02139 USA

来源：

CHEMISTRY OF MATERIALS | 2010年 / 22卷 / 18期

关键词：

STABILIZED MAGNETIC FLUIDS; SMALL-ANGLE NEUTRON; CATALYZED HYDROLYSIS; GOLD NANOPARTICLES; ESTER HYDROLYSIS; PHENYL ESTER; OLEIC-ACID; METAL; BINDING; SURFACE;

D O I：

10.1021/cm1018508

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Novel nucleophilic ligands were synthesized from oleic acid conjugated with 2-mercaptoimidazole via a UV-initiated thiol-ene reaction, and by a condensation of trans-9,10-epoxystcaric acid with 4(5)-imidazoledithiocarboxylic acid. Nanoparticles (NPs) with 10-100 nm Ag(0) or Co(0) cores were obtained by reduction of Ag+ or Co2+ by borohydride in N,N-dimethylformamide or aqueous solutions respectively. The NPs capped with oleic acid or 9,10-epoxystearic acids were further covalently bound to 2-mercaptoimidazole or 4(5)-imidazoledithiocarboxylic acid. The ligands and NPs functionalized with nucleophilic imidazole moieties enabled facile hydrolysis of paraoxon (O,O-diethyl O-(p-nitrophenyl) phosphate) by NPs in their aqueous media. The NPs acted as recoverable semiheterogeneous catalysts. The paraoxon hydrolysis was accelerated 10- to 50-fold by the formation of complexes between the imidazole-containing ligands or NPs with Co2+.

引用

页码：5383 / 5391

页数：9

共 79 条

[1] THE RELATIVE AFFINITIES OF LIGAND ATOMS FOR ACCEPTOR MOLECULES AND IONS [J].