Catalyst‐ and Template‐Free Ultrafast Visible‐Light‐Triggered Dimerization of Vinylpyridine‐Functionalized Tetraarylaminoborane: Intriguing Deep‐Blue Delayed Fluorescence. (16th November 2018)

• Record Type: Journal Article
• Authors: Neena, Kalluvettukuzhy K.; Sudhakar, Pagidi; Thilagar, Pakkirisamy
• Is Part Of: Angewandte Chemie. Volume 130:Number 51(2018)
• Page Start: 17048
• Page End: 17052
• Publication Date: 2018-11-16
• Subjects: Aminoborane -- Bor -- Photodimerisierung -- Verzögerte Fluoreszenz; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201811353
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: A photoredox‐catalyst‐ and template‐free sunlight‐induced molecular dimerization of a vinylpyridine‐functionalized tetraarylaminoborane (TAAB) has been accomplished for the first time. The reaction is quantitative, highly regioselective, and thermally irreversible. The presence of the propeller‐shaped TAAB framework allows selective photodimerization of one of the two vinyl pyridine units. Monomer 1 and photodimer 2 exhibit distinct photophysical properties with delayed fluorescence (DF) both in solution and the solid state, which was confirmed by steady‐state and time‐resolved luminescence studies. Quantum mechanical calculations were performed to support the experimental observations. Our new approach using [2+2] cycloaddition chemistry paves the way for the development of highly sought‐after deep‐blue DF materials. Abstract : Sichtbares Licht induziert die Photodimerisierung eines Tetraarylaminoborans (TAAB) mit Vinylpridin‐Seitengruppen ohne Photoredoxkatalysator oder Templat in einer Rekordzeit von nur 1 h. Sowohl das Monomer als auch das Photodimer zeigen charakteristische photophysikalische Eigenschaften mit tiefblauer verzögerter Fluoreszenz (DF) in Lösung und im festen Zustand.