Light harvesting vesicular donor–acceptor scaffold limits the rate of charge recombination in the presence of an electron donor

Abstract

This work highlights the utility of π–π stacked self-assembly for enhanced survival time of charge transfer intermediates upon photoexcitation of donor–acceptor systems.

Enhanced intersystem crossing in core-twisted aromatics

“…Our on-going interest in core-twisted 21 organic chromophores 22 prompted us to study the role of twisting in triplet formation. Recent efforts from our group on bay substitution with multiple bromine atoms revealed the core-twisted geometry of perylenediimide which results in an enhancement in triplet generation.…”

Viable access to the triplet excited state in peryleneimide based palladium complex $$^{\S }$$ §

“…15,16 To date, the access to the triplet excited state in organic chromophores has been reported via bimolecular triplet sensitization, 17 spin-orbit coupling mediated heavy-atom effect, [18][19][20][21] singlet fission 14,22,23 and charge-recombination of the photoinduced radical-ion pair intermediates. [24][25][26] Though the above-mentioned methods can populate the triplet state, they are prone to annihilation and the generation of efficient long-lived triplet excited-state in innately triplet deficient chromophores remains a highly investigated subject.…”

Unreactive Gel Networks as Versatile Confined Spaces for Enhanced Photoinduced Processes

“…Among the above‐mentioned classical confined media, the use of gels as reaction vessels for photoinduced processes has been only scarcely explored despite their remarkable potential as nanoreactors . Most of the examples reporting gels and photoinduced reactions involve either photopolymerization of the gel phase built from gelators bearing polymerizable groups or the use of photoactive gelators . Shinkai and co‐workers pioneered the studies of the photodimerization of anthracene derivatives at 366 nm in supramolecular gel systems based on 2‐anthracenecarboxylic acid (2Ac), resulting in different degrees of stereoselectivity (e.g., head ‐to‐ head vs. head ‐to‐ tail photodimers) depending on both the structure of the gelator and the nature of the solvent .…”

“…[17,18] Most of the examples reporting gels and photoinduced reactions involve either photopolymerization of the gel phase built from gelators bearing polymerizable groups [17] or the use of photoactive gelators. [19,20] Shinkai and co-workers pioneered the studies of the photodimerization of anthracene derivatives at 366 nm in supramolecular gel systems based on 2-anthracenecarboxylic acid (2Ac), resulting in different degrees of stereoselectivity (e.g., head-to-head vs. head-to-tail photodimers) depending on both the structure of the gelator and the nature of the solvent. [21][22][23] However, in all these cases the gel network is the reactive specie and, therefore, the thermal, mechanical and morphological properties of the gel assembly are modified upon irradiation.…”