Currently, the development of circularly polarized luminescent (CPL) materials has drawn extensive attention due to the numerous potential applications in optical data storage, displays, backlights ...in 3D displays, and so on. While the fabrication of CPL‐active materials generally requires chiral luminescent molecules, the introduction of the “self‐assembly” concept offers a new perspective in obtaining the CPL‐active materials. Following this approach, various self‐assembled materials, including organic‐, inorganic‐, and hybrid systems can be endowed with CPL properties. Benefiting from the advantages of self‐assembly, not only chiral molecules, but also achiral species, as well as inorganic nanoparticles have potential to be self‐assembled into chiral nanoassemblies showing CPL activity. In addition, the dissymmetry factor, an important parameter of CPL materials, can be enhanced through various pathways of self‐assembly. Here, the present status and progress of self‐assembled nanomaterials with CPL activity are reviewed. An overview of the key factors in regulating chiral emission materials at the supramolecular level will largely boost their application in multidisciplinary fields.
Recent development of circularly polarized luminescent (CPL) materials has aroused extensive attention. The self‐assembly strategy is proposed to address the barriers of tedious syntheses and the restricted substitutes during the development of CPL‐active materials. By highlighting the meritorious findings, the present status and progress in this field are reviewed, with the aim of boosting the development of chiroptical materials.
Full text
Available for:
BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SBCE, SBMB, UL, UM, UPUK
Owing to its high charge-carrier mobility, tunable direct-bandgap and unique in-plane anisotropic structure, black phosphorus (BP), a rising star of post-graphene two-dimensional (2D) nanomaterials, ...has been intensively investigated since early 2014. To explore its full potential and push the limits, research into BP-based novel functional nanostructures (
i.e.
, nanomaterials and nanodevices) by means of hybridization, doping, and functionalization is rapidly expanding. Indeed, the cutting-edge developments and applications of BP nanostructures have had a significant impact on a wide range of research areas, including field effect transistors, diodes, photodetectors, biomedicine, sodium-ion batteries, photocatalysis, electrocatalysis, memory devices, and more. This tutorial review summarizes the recent advances of BP nanostructures and outlines the future challenges and opportunities.
This tutorial review summarizes the recent advances in BP-based nanostructures by means of hybridization, doping and functionalization.
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).
Amplification of circularly polarized luminescence (CPL) is demonstrated in a triplet–triplet annihilation-based photon upconversion (TTA-UC) system. When chiral binaphthyldiamine acceptors are ...sensitized with an achiral Pt(II) octaethylporphine (PtOEP) in solution, upconverted circularly polarized luminescence (UC-CPL) were observed for the first time, in which the positive or negative circularly polarized emission could be obtained respectively, following the molecular chirality of the acceptors (R/S). More interestingly, one order of magnitude amplification of the dissymmetry factor g lum in UC-CPL was obtained in comparison with the normal promoted CPL. The multistep photophysical process of TTA-UC including triplet–triplet energy transfer (TTET) and triplet–triplet annihilation (TTA) have been suggested to enhance the UC-CPL, which provided a new strategy to design CPL materials with a higher dissymmetry factor.
Full text
Available for:
IJS, KILJ, NUK, PNG, UL, UM
Helical structures such as double helical DNA and the α‐helical proteins found in biological systems are among the most beautiful natural structures. Chiral nanoarchitectonics, which is used here to ...describe the hierarchical formation and fabrication of chiral nanoarchitectures that can be observed by atomic force microscopy (AFM), scanning tunneling microscopy (STM), scanning electron microscopy (SEM), or transmission electron microscopy (TEM), is one of the most effective ways to mimic those natural chiral nanostructures. This article focuses on the formation, structure, and function of the most common chiral nanoarchitectures: nanoscale chiral twists and helices. The types of molecules that can be designed and how they can form hierarchical chiral nanoarchitectures are explored. In addition, new and unique functions such as amplified chiral sensing, chiral separation, biological effects, and circularly polarized luminescence associated with the chiral nanoarchitectures are discussed.
Chiral nanoarchitectonics is used to describe the hierarchical formation and fabrication of chiral nanoarchitectures, which can be observed using various microscopy imaging methods. The building of chiral nanoarchitectures such as nanoscale chiral twists and helices from molecules and building blocks using bottom‐up self‐assembly is discussed. In addition, new functions emerging from chiral nanoarchitectures are presented.
Full text
Available for:
BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SBCE, SBMB, UL, UM, UPUK
The design and fabrication of quantum dots (QDs) with circularly polarized luminescence (CPL) has been a great challenge in developing chiroptical materials. We herein propose an alternative to the ...use of chiral capping reagents on QDs for the fabrication of CPL‐active QDs that is based on the supramolecular self‐assembly of achiral QDs with chiral gelators. Full‐color‐tunable CPL‐active QDs were obtained by simple mixing or gelation of a chiral gelator and achiral 3‐mercaptopropionic acid capped QDs. In addition, the handedness of the CPL can be controlled by the supramolecular chirality of the gels. Moreover, QDs with circularly polarized white light emission were fabricated for the first time by tuning the blending ratio of colorful QDs in the gel. The chirality transfer in the co‐assembly of the achiral QDs with the gelator and the spacer effect of the capping reagents on the QD surface are also discussed. This work provides new insight into the design of functional chiroptical materials.
Circularly polarized luminescence (CPL) was observed for various co‐gels with nanotube structures that had been assembled from achiral quantum dots (QDs) and a chiral lipid gelator. Full‐color and white CPL was achieved through mixing several QDs with different colors with the chiral gelator.
Full text
Available for:
BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SBCE, SBMB, UL, UM, UPUK
Circularly polarized luminescent (CPL) materials are currently attracting great interest. While a chiral building is usually necessary in order to obtain CPL materials, here, this study proposes a ...general approach for fabricating 1D circularly polarized luminescent nanoassemblies from achiral aromatic molecules or aggregation‐induced emissive compounds (AIEgens). It is found that a C3 symmetric chiral gelator can individually form hexagonal nanotube structures and encapsulate the guest molecules. When achiral AIEgens are encapsulated into the confined nanotubes via organogelation, the AIEgens will emit circularly polarized luminescence. Further, the direction of the CPL could be controlled by the supramolecular chirality of the nanotube. Remarkably, the approach is universal and various kinds of the AIEgens can be doped to show such property, providing a full‐color‐tunable circularly polarized luminescence.
Circularly polarized luminescence is observed from achiral dyes doped in confined chiral nanotube organogels which are assembled from C3 symmetric chiral gelators with hexagonal tubular structures. This provides a versatile approach for fabricating 1D circularly polarized luminescent materials.
Full text
Available for:
BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SBCE, SBMB, UL, UM, UPUK
8.
Supramolecular chiroptical switches Zhang, Li; Wang, Han-Xiao; Li, Shuai ...
Chemical Society reviews,
12/2020, Volume:
49, Issue:
24
Journal Article
Peer reviewed
Chiroptical switches, whose chiral optical signals such as optical rotatory dispersion (ORD), circular dichroism (CD) and circularly polarized luminescence (CPL) are reversibly interchangeable ...between two states, offer many promising applications in the fields of chiral sensing, optical displays, information storage, asymmetric catalysis and so on. Through various non-covalent interactions, supramolecular chiroptical switches have been constructed by combining the chiral and responsive functional components. This review summarizes the recent progress in the construction of supramolecular chiroptical switchable systems that reversibly respond to various stimuli, such as light, electricity, magnetic fields, mechanical force, solvents, pH, temperature, and chemical additives. The switching of supramolecular chirality in the forms of on/off, amplification/weakening and chirality inversion is shown. Additionally, the design of chiroptical switchable systems for chiral logic gates, data communication, chiral separation and asymmetric catalysis has been demonstrated. Future challenges in developing supramolecular chiroptical switches are also discussed.
Recent progress in chiroptical switches including on/off, amplification, and inversion of the chiral signals such as ECD and CPL in supramolecular assemblies is shown.
Direct utilization of the full spectrum of renewable solar light, in particular the visible‐ and near‐infrared (NIR) portions, is currently receiving a great deal of attention in solar‐to‐chemical ...energy conversion—a clean, economically, and environmentally sustainable process. Black phosphorus (BP), a newly emerging class of ultrathin 2D nanomaterials rediscovered in early 2014, fulfills this purpose due to its unique properties like high charge‐carrier mobility and tunable direct‐bandgap. To this end, the rational combinations of BP in the form of few‐layer nanosheets or ultrasmall quantum dots with a range of organic and inorganic nanomaterials offer more versatile and robust hybrids and nanocomposites that are functional in solar fuel production and environmental remediation. Herein, the most recent and key achievements of BP‐based nanostructured photocatalysts in water splitting, organic pollutant degradation, and nitrogen fixation under either visible‐ or NIR‐light illumination are summarized. Furthermore, perspectives on the potential future research directions are provided.
The latest advances in black phosphorus (BP)‐based nanostructures toward direct solar‐to‐chemical energy conversion such as water splitting, organic pollutant degradation, and nitrogen fixation under either visible‐ or near‐infrared‐light illumination are highlighted, focusing on novel hybrids and nanocomposites combining ultrathin BP nanosheets or ultrasmall BP quantum dots with a range of organic and inorganic nanomaterials.
Full text
Available for:
BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SBCE, SBMB, UL, UM, UPUK
Ever since the axial chiral catalysts were developed for asymmetric reactions with excellent chiral discrimination and high efficiencies, the interest in the supramolecular catalyst has also been ...extensively investigated. Here, with a hint from the typical molecular catalyst, we developed a series of metal-coordinated nanotube (M-helical nanotube, M-HN) catalysts for asymmetric reactions. The M-HN catalyst was fabricated on the basis of the self-assembly of an l-glutamic acid terminated bolaamphiphile, which formed a single-walled nanotube. On one hand, through the coordination of transition metal ions with the carboxylic acid groups on the nanotube surface, a wide variety of single-walled M-HN catalysts could be fabricated, in which the coordination sites could serve as the catalytic sites. On the other hand, using a slight amount of these catalysts, significant reactivity and enantioselectivity were realized for certain asymmetric reactions under mild conditions. Remarkably, Bi(III)-HN could catalyze the asymmetric Mukaiyama aldol reaction with high enantioselectivity (up to 97% ee) in an aqueous system; Cu(II)-HN catalyzed the asymmetric Diels–Alder reaction with up to 91% ee within 60 min. It was suggested that a synergetic effect of the aligned multicatalytic sites and stereochemical selectivity of the M-HN lead to an excellent catalytic performance. Through this work, we proposed a new concept of a single-walled nanotube as catalyst and showed the first example of nanotube catalysts presenting high reactivity and enantioselectivity that rivaled a chiral molecular catalyst.
Full text
Available for:
IJS, KILJ, NUK, PNG, UL, UM
PDF
