Platinum(II) Schiff Base Complexes as Photocatalysts for Visible‐Light‐Induced Cross‐Dehydrogenative Coupling Reactions. Issue 10 (1st July 2015)

• Record Type: Journal Article
• Authors: Shelar, Deepak Prakash; Li, Ting‐Ting; Chen, Yong; Fu, Wen‐Fu
• Is Part Of: ChemPlusChem. Volume 80:Issue 10(2015:Oct.)
• Page Start: 1541
• Page End: 1546
• Publication Date: 2015-07-01
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1002/cplu.201500157
• Languages: English
• ISSNs: 2192-6506

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Four phosphorescent platinum(II) Schiff base complexes are screened for application in visible‐light‐induced cross‐dehydrogenative coupling (CDC) reactions. Preliminary studies show that, among the four platinum(II) complexes, <bold>Pt3</bold> is an efficient catalyst for CDC reactions with oxygen as an oxidant. Light irradiation (<italic>λ</italic>&gt;420 nm) on a mixture of the Pt^II complex, tertiary amine, and a variety of nucleophiles (nitroalkanes, ketones, or indoles) under aerobic conditions gives α‐functionalized tertiary amines in good to excellent yields. The photoluminescence quenching experiment reveals that the CDC reaction is initiated by photoinduced electron transfer from <italic>N</italic>‐phenyltetrahydroisoquinoline to the Pt^II complex. Further, electron spin resonance (ESR) measurements clearly indicate the formation of superoxide radical anions (O₂^.−) rather than singlet oxygen (¹O₂) during the photocatalytic reaction.</p> </abstract>