Controlling the Selectivity of the Surface Plasmon Resonance Mediated Oxidation of p‐Aminothiophenol on Au Nanoparticles by Charge Transfer from UV‐excited TiO21. Issue 23 (17th April 2015)

• Record Type: Journal Article
• Authors: Wang, Jiale; Ando, Romulo A.; Camargo, Pedro H. C.
• Is Part Of: Angewandte Chemie international edition. Volume 54:Issue 23(2015)
• Page Start: 6909
• Page End: 6912
• Publication Date: 2015-04-17
• Subjects: catalysis -- nanoparticles -- oxidation -- photochemistry -- surface plasmon resonances; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201502077
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Although catalytic processes mediated by surface plasmon resonance (SPR) excitation have emerged as a new frontier in catalysis, the selectivity of these processes remains poorly understood. Here, the selectivity of the SPR‐mediated oxidation of p ‐aminothiophenol (PATP) employing Au NPs as catalysts was controlled by the choice of catalysts (Au or TiO2 ‐Au NPs) and by the modulation of the charge transfer from UV‐excited TiO2 to Au. When Au NPs were employed as catalyst, the SPR‐mediated oxidation of PATP yielded p, p ‐dimercaptobenzene (DMAB). When TiO2 ‐Au NPs were employed as catalysts under both UV illumination and SPR excitation, p ‐nitrophenol (PNTP) was formed from PATP in a single step. Interestingly, PNTP molecules were further reduced to DMAB after the UV illumination was removed. Our data show that control over charge‐transfer processes may play an important role to tune activity, product formation, and selectivity in SPR‐mediated catalytic processes. Abstract : Controlling selectivity : The selectivity of the surface plasmon resonance (SPR) mediated oxidation of p ‐aminothiophenol was controlled by the choice of catalysts (Au or TiO2 –Au nanoparticles; NPs) and by the modulation of the charge transfer from UV‐excited TiO2 to Au. While p, p ‐dimercaptobenzene was obtained using Au NPs as catalyst, the use of TiO2 –Au NPs under both UV illumination and SPR excitation led to the formation of p ‐nitrophenol.