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Controlling the Emergence and Shift Direction of Mechanochromic Luminescence Color of a Pyridine-Terminated Compound
摘要： In this study, mechanochromic luminescence was induced in a complex of mechano-inactive compounds. Dye/acid complexes containing the same p-conjugated backbones was prepared. While the luminophore showed blue and red shifts in photoluminescence spectra when combined with different acids by grinding, it exhibited slight mechanoresponsiveness itself. Also, compounds with similar molecular backbones to the dye/acid complex were synthesized to clarify the color change mechanism. The compounds showed both blue and red shifts in photoluminescence and diffuse reflectance spectra upon grinding, indicating that mechanochromic luminescence in the hydrogen-bonded complex is like its monomeric analogue and that aggregation structure plays an important role in the mechanoresponsive behavior rather than p-conjugated structure. We showed that mechanoinduced color change can be induced by imitating mechanoresponsive compounds without synthetic modification.
关键词： Luminescence,Supramolecular chemistry,Aggregation
更新于2025-09-23 15:23:52
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A multi-color and white-light emissive cucurbituril/terpyridine/lanthanide supramolecular nanofiber
摘要： Multi-color and white light luminescence materials based on supramolecular assemblies are attractive because of their potential applications in advanced light-emitting material. Herein, a cucurbit[8]uril-enhanced lanthanide luminescent supramolecular assembly was constructed in a facile but efficient way using terpyridine imidozalium cations, cucurbit[8]urils and rare earth ions such as Tb3+ and Eu3+. Significantly, the resultant fibrous supramolecular assembly, with an average width of 15 nm, could emit remarkable lanthanide luminescence, which was ten times higher than the corresponding terpyridine/Ln3+ without cucurbit[8]uril. And the solid state luminescence of supramolecular assembly could be smartly and easily turned among blue, green, red and white by adjusting the molar ratios between Tb3+ and Eu3+. The enhanced white-light emission by supramolecular strategy may provide a new approach for smart and tunable solid luminescent materials.
关键词： Cucurbit[8]uril,White-light emission,Supramolecular chemistry,Host-guest interaction,Lanthanide luminescence
更新于2025-09-23 15:23:52
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Divergent Terpyridine-Based Coordination for the Construction of Photoactive Supramolecular Structures
摘要： Exploring new materials to manipulate luminescent radiation and investigate the interaction of light and matter is one of the most compelling prospects of our century. Supramolecular chemistry has unraveled the opportunity to synergistically combine the chemical and optoelectronic properties of the most diverse classes of compounds. Among these, terpyridines have acted as pivotal ligand units that enable self-assembly of multicomponent chromophoric systems. In this review we therefore elucidate the metal-coordinating ability of these materials, that promote a plethora of aggregation-induced phenomena. In particular, fluorescence tuning, reversible stimuli-responsive phosphorescence enhancement and low-dimensional complexation have been demonstrated for carbon and sulfur based terpyridine oligomeric structures. Common thread of such processes is the versatile application of light as a trigger for spectroscopic investigation and output for superior optical, medical and sensing devices.
关键词： Luminescence,Terpyridine,Supramolecular chemistry,Polymers
更新于2025-09-23 15:23:52
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Photoresponsive Halogen-Bonded Liquid Crystals: The Role of Aromatic Fluorine Substitution
摘要： A new strategy for controlling the liquid crystalline and photophysical properties of supramolecular mesogens assembled via halogen bonding is reported. Changing the degree of fluorination at the halogen-bond donor of the supramolecular liquid crystal allows for the fine-tuning of the halogen bond strength and thereby provides control over the temperature range of the mesophase. At least three fluorine atoms have to be present to ensure efficient polarization of the halogen-bond donor and the formation of a mesophase. In addition, it was found that stilbazole acceptors are superior to their azopyridine counterparts in promoting stable liquid crystalline phases. The halogen-bond-driven supramolecular liquid crystals between fluorinated azobenzenes and stilbazole/azopyridine acceptors show a rich variety of photoinduced processes driven by azobenzene photoisomerization, dictated not only by the photochemical properties of the molecular components but also by the difference between the operation temperature and the clearing point.
关键词： photoresponsive materials,fluorination,supramolecular chemistry,azobenzenes,halogen bonding,liquid crystals
更新于2025-09-23 15:23:52
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Light-powered, artificial molecular pumps: a minimalistic approach
摘要： The realization of artificial molecular motors capable of converting energy into mechanical work is a fascinating challenge of nanotechnology and requires reactive systems that can operate away from chemical equilibrium. This article describes the design and construction of a simple, supramolecular ensemble in which light irradiation causes the directional transit of a macrocycle along a nonsymmetric molecular axle, thus forming the basis for the development of artificial molecular pumps.
关键词： molecular machine,azobenzene,rotaxane,supramolecular chemistry,photochemistry
更新于2025-09-23 15:22:29
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Self-assembled Ln(III) cyclen-based micelles and AuNPs conjugates as candidates for luminescent and magnetic resonance imaging (MRI) agents
摘要： The tetra-substituted heptadentate cyclen (1,4,7,10-tetraazacyclododecane) based Eu(III)/Tb(III)/Gd(III)-complexes 1.Ln and 2.Ln were developed. 1.Eu/Tb and 2.Eu/Tb were employed in the formation of luminescent self-assembling ternary structures, and we demonstrate that only in the presence of appropriate sensitizing antennae, was the lanthanide-emission of 1.Eu/Tb and 2.Eu/Tb ‘switched on’. 1.Gd/2.Gd were developed as potential MIR contrast agents, and employed in NMRD-measurements, where their relaxivity was investigated, and their (relatively high) r1 values determined. The formation of a self-assembled micelle-type structure was clearly observed for 2.Gd. The functionalised gold nanoparticles 1.Ln-AuNP were also synthesized from 1.Ln. As for the free complexes, the Ln-emission was ‘switched on’ for 1.Eu/Tb-AuNP in the presence of the antennae. NMRD measurements indicated that the relaxivity for the 1.Gd-AuNP systems was very high, with a value of 445 s-1mM-1 (at 400 MHz), demonstrating the cumulative effect of the relatively high number of 1.Gd complexes on the surface of the AuNP.
关键词： gold nanoparticles,lanthanides,Supramolecular chemistry,luminescence,MRI contrast agents,cyclen complexes
更新于2025-09-23 15:19:57
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Semiconductor Quantum Dots as Components of Photoactive Supramolecular Architectures
摘要： Luminescent quantum dots (QDs) are colloidal semiconductor nanocrystals consisting of an inorganic core covered by a molecular layer of organic surfactants. Although QDs have been known for more than thirty years, they are still attracting the interest of researchers because of their unique size-tunable optical and electrical properties arising from quantum confinement. Moreover, the controlled decoration of the QD surface with suitable molecular species enables the rational design of inorganic-organic multicomponent architectures that can show a vast array of functionalities. This minireview highlights the recent progress in the use of surface-modified QDs – in particular, those based on cadmium chalcogenides – as supramolecular platforms for light-related applications such as optical sensing, triplet photosensitization, photocatalysis and phototherapy.
关键词： supramolecular chemistry,sensing,catalysis,triplet sensitization,quantum dots
更新于2025-09-19 17:13:59
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The Power of Confocal Laser Scanning Microscopy in Supramolecular Chemistry: In situ Reala??time Imaging of Stimulia??Responsive Multicomponent Supramolecular Hydrogels
摘要： Multicomponent supramolecular hydrogels are promising scaffolds for applications in biosensors and controlled drug release due to their designer stimulus responsiveness. To achieve rational construction of multicomponent supramolecular hydrogel systems, their in-depth structural analysis is essential but still challenging. Confocal laser scanning microscopy (CLSM) has emerged as a powerful tool for structural analysis of multicomponent supramolecular hydrogels. CLSM imaging enables real-time observation of the hydrogels without the need of drying and/or freezing to elucidate their static and dynamic properties. Through multiple, selective fluorescent staining of materials in supramolecular hydrogels (e.g. inorganic materials and self-sorting nanofibers) can also be visualized. CLSM and the related microscopic techniques will be indispensable to investigate complex life-inspired supramolecular chemical systems.
关键词： confocal microscopy,gels,self-assembly,supramolecular chemistry,stimulus response
更新于2025-09-19 17:13:59
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Encapsulation of Organic Dyes within an Electron-Deficient Redox Metal-Organic Tetrahedron for Photocatalytic Proton Reduction
摘要： The design of artificial systems that mimic highly evolved and finely tuned natural photosynthetic systems is a subject of intensive research. By incorporating electron-deficient anthraquinone within the ligand backbone, a redox-active Ni-based tetrahedron was developed as a redox vehicle for the construction of an artificial photosynthesis system. The tetrahedron can encapsulate fluorescein within its cavity for light-driven H2 evolution, with the turnover number reaching 1200 moles H2 per mole redox catalyst. This well-designed supramolecular system displayed a significantly superior activities compared with the reference mononuclear compound or introducing an inactive inhibitor (ATP), which confirmed this enzymatic photocatalytic behaviour.
关键词： light-driven H2 evolution,metal-organic tetrahedral,anthraquinone,supramolecular chemistry
更新于2025-09-10 09:29:36
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Comprehensive Supramolecular Chemistry II || Fluorescent Sensors Based on Indicator Displacement
摘要： Indicator displacement assays (IDAs) provide a different, more versatile approach to chemical sensing. In these systems, introduced to supramolecular chemists by Inouye, and popularized by Anslyn soon thereafter, there is no covalent linkage between the receptor and the indicator moieties. Instead, the indicator is typically chosen to be capable of binding at the same position in the receptor as the analyte, therefore establishing a competition between the indicator and the analyte for the receptor’s binding site. One typically prepares a receptor–indicator complex as the sensing system, which is then exposed to the analyte. The analyte displaces the indicator from the receptor, either by way of its stronger affinity or through mass action, thereby freeing the indicator back into the solution bulk. Decomplexation is typically accompanied by drastic changes in one or more macroscopic properties of the indicator (e.g., color, absorbance, fluorescence, electrochemical properties): monitoring this property allows the experimenter to follow the otherwise silent binding event between the analyte and the receptor.
关键词： Supramolecular Chemistry,Indicator Displacement,Chemical Sensing,Fluorescent Sensors
更新于2025-09-10 09:29:36