Visible-light photoexcitation of pyridine surface complex, leading to selective dehydrogenative cross-coupling with cyclohexane. Issue 45 (5th September 2018)

• Record Type: Journal Article
• Authors: Naniwa, Shimpei; Tyagi, Akanksha; Yamamoto, Akira; Yoshida, Hisao
• Is Part Of: Physical chemistry chemical physics. Volume 20:Issue 45(2018)
• Page Start: 28375
• Page End: 28381
• Publication Date: 2018-09-05
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c8cp04292f
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : A pyridine–TiO2 LMCT complex is excited by visible light to achieve selective DCC with cyclohexane via a unique reaction mechanism. Abstract : Upon photoirradiation with visible light, a pyridine molecule adsorbed on a TiO2 surface can be photoexcited to give a pyridine radical cation via ligand-to-metal charge transfer (LMCT) between pyridine and titanium. This leads to dehydrogenative cross-coupling (DCC) between pyridine and cyclohexane with concomitant hydrogen evolution. Since the radical cation can selectively oxidize cyclohexane to a cyclohexyl radical, the cross-coupling between pyridine and cyclohexane proceeds with higher selectivity compared with that in photocatalysis by TiO2 under UV irradiation.