Catalyst‐ and Template‐Free Ultrafast Visible‐Light‐Triggered Dimerization of Vinylpyridine‐Functionalized Tetraarylaminoborane: Intriguing Deep‐Blue Delayed Fluorescence

Abstract

Ap hotoredox-catalyst-and template-free sunlightinduced molecular dimerization of av inylpyridine-functionalized tetraarylaminoborane (TAAB) has been accomplished for the first time.T he reaction is quantitative,h ighly regioselective,a nd thermally irreversible.T he presence of the propeller-shaped TAAB framework allows selective photodimerization of one of the two vinyl pyridine units.M onomer 1 and photodimer 2 exhibit distinct photophysical properties with delayed fluorescence (DF) both in solution and the solid state,w hichw as confirmed by steady-state and time-resolved luminescence studies.Q uantum 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.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Photocatalytic Homocoupling Transformations

“…This simple strategy opens up new avenues for the development of novel optoelectronic materials through a green synthetic route, since the present procedure does not require any organic solvents or harmful UV radiation as the energy source. 41 Cyclobutanes 36 were diastereoselectively prepared through an anti head-to-head coupling by using an elegant multicomponent cascade reaction that proceeded via an aldol reaction → visible-light-induced (blue LED) [2+2] cycloaddition. The best results were achieved using 1 mol% of the photoredox catalyst [Ir(ppy) 3 ] (35) at room temperature.…”

Status of Inorganic Chemistry Research in India

“…They have established the design and development of multiple emissive molecular polyads, aggregation induced emissive small molecules, strongly luminescent organic/organometallic solids and external stimuli responsive materials (Swamy et al, 2013). The concepts of BN/CC isosterism and topochemistry was utilized to assemble deep-blue delayed fluorescent materials (Neena et al, 2018).…”

Phenoxazine-Dibenzothiophene Sulfoximine Emitters Featuring Both Thermally Activated Delayed Fluorescence and Aggregation Induced Emission

“…Currently, it has been demonstrated by numerous reports that conjugation of nitrogen-containing aromatics (i.e., carbazole [26], dimethylacridane [27], phenoxazine [28,29]) with acceptors such as aza-aromatic rings [15][16][17][18][19], ketones [29][30][31], vestigations [23][24][25]. Currently, it has been demonstrated by numerous reports that conjugation of nitrogen-containing aromatics (i.e., carbazole [26], dimethylacridane [27], phenoxazine [28,29]) with acceptors such as aza-aromatic rings [15][16][17][18][19], ketones [29][30][31], nitriles [32][33][34], sulfones [35][36][37], boranes [38,39], amides [40], could realize decent device efficiencies. However, the majority of these structural units are chemically inert and not easy to be functionalized, disfavoring color management or further optimization of device performances.…”