Abstract
Transfer of both chirality and energy information plays an important role in biological systems. Here we show a chiral donor π-gelator and assembled it with an achiral π-acceptor to see how chirality and energy can be transferred in a composite donor–acceptor system. It is found that the individual chiral gelator can self-assemble into nanohelix. In the presence of the achiral acceptor, the self-assembly can also proceed and lead to the formation of the composite nanohelix. In the composite nanohelix, an energy transfer is realized. Interestingly, in the composite nanohelix, the achiral acceptor can both capture the supramolecular chirality and collect the circularly polarized energy from the chiral donor, showing both supramolecular chirality and energy transfer amplified circularly polarized luminescence (ETACPL).
Highlights
Transfer of both chirality and energy information plays an important role in biological systems
Since the excited state of donor or acceptor can possibly have energy, the other is that during such chirality transfer process, how energy transfer is related to the chirality? As expected, we find that the chiral gelator could form chiral nanohelix through gelation and show both supramolecular chirality and circularly polarized luminescence (CPL)
By carefully examining the CD signal, we found that, while the CD bands ascribed to the cyano-substituted stilbene (CNSB) remained, there are two additional positive ICD signals for L-1/BPEA, whereas two negative CD signals for D-1/BPEA located at 445 and 470 nm, which are consistent with the absorption peaks of BPEA observed in gels
Summary
Transfer of both chirality and energy information plays an important role in biological systems. Transfer of information in living organisms is mutichannel, through chirality-based structural information, and through ion-, electron- and light-based energy types[13,14,15,16] Inspired by these sophisticated information communications in physiological systems, many researchers have tried to mimic the chiroptical material systems through a molecular to supramolecular level by self-assembly strategy[2,7,8,10,17,18,19,20,21]. Chirality transfer could be realized by just weak p–p interaction other than common hydrogen bonding[31], electrostatic interaction[32] or chain interdigitation[33,34] In this composite nanohelix assemblies, the acceptor BPEA could capture the energy from the chiral gel through highly efficient energy transfer. Supramolecular chirality transferred from the chiral species to the achiral component and the production of CPL has been reported, the study presented highlights the ETACPL in the self-assembly nanoscale systems
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