Desulfurization of Mercaptobenzimidazole and Thioguanine on Gold Nanoparticles Using Sodium Borohydride in Water at Room Temperature
Abbreviated Journal Title
J. Phys. Chem. C
ENHANCED RAMAN-SCATTERING; CATALYTIC-ACTIVITY; DEPENDENT CATALYSIS; OXIDATION CATALYSIS; LIGAND ADSORPTION; AU NANOPARTICLES; PARTICLE-SIZE; NANOCLUSTERS; REDUCTION; CLUSTERS; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, ; Multidisciplinary
Organosulfur compounds are known to poison metallic nanoparticle catalysts. Herein NaBH4 is shown to desorb and desulfurize 2-mercaptobenzimidazole (2-MBI) and 6-thioguanine (6-TG) adsorbed on 10, 15, and 50 nm diameter gold nanoparticles (AuNPs). The desulfurization rates decrease significantly with increasing AuNP sizes. Isotope labeling experiments, conducted with NaBD4 in H2O, indicate that this desulfurization reaction proceeds through a pathway requiring hydrogen uptake onto AuNP surfaces prior to the 2-MBI or 6-TG desulfurization reaction, rather than direct hydride attack from BH4- on the sulfur-bearing carbon in 2-MBI or 6-TG, or H-2 reaction with 2-MBI or 6-TG. In addition to serving as the hub for electron charge transfer between hydride and proton, AuNPs capture the cleaved sulfide, facilitating sulfur separation from the desulfurized products.
Journal of Physical Chemistry C
"Desulfurization of Mercaptobenzimidazole and Thioguanine on Gold Nanoparticles Using Sodium Borohydride in Water at Room Temperature" (2013). Faculty Bibliography 2010s. 3620.