Journal of the American Chemical Society, Год журнала: 2024, Номер unknown
Опубликована: Дек. 25, 2024
The photoswitching of supramolecular host-guest complexes is the basis numerous molecularly controlled macroscopic functions, such as sol-gel transition, photopharmacology, active transport ions or molecules, light-powered molecular machines, and much more. most commonly used systems employ photoactive azobenzene guests synthetic host which bind stable
Язык: Английский
Nature Communications, Год журнала: 2024, Номер 15(1)
Опубликована: Окт. 7, 2024
Azo switches are widely employed as essential components in light-responsive systems. Here, we develop an azo-fluorescent switch that is visible and its processes can be monitored using fluorescence imaging. Visible light irradiation promotes isomerization, accompanied by changes enable the process to through Furthermore, document nanocavity size of liposome encapsulated nanoparticles containing azo isomerization show this change enables construction a nanoplatform for optically controlled release antimycotics. Also, natural activation loaded with antimycotic agent causes death Rhizoctonia solani. The results these double holding period comparison small molecule strategy used design imaging-guided light-controlled nano-antimycotic system applicable protocols delivery wide variety drugs.
Язык: Английский
Процитировано
8
Chemical Communications, Год журнала: 2025, Номер unknown
Опубликована: Янв. 1, 2025
Photoisomerization of a [2]catenane-based receptor functionalized with stiff-stilbene allows for on demand uptake and release chloride ions.
Язык: Английский
Процитировано
1
Journal of the American Chemical Society, Год журнала: 2024, Номер unknown
Опубликована: Ноя. 28, 2024
Traditional desalination methods face criticism due to high energy requirements and inadequate trace ion removal, whereas natural light-driven pumps offer superior efficiency. Current synthetic systems are constrained by short exciton lifetimes, which limit their ability generate sufficient electric fields for effective pumping. We introduce an innovative approach utilizing covalent-organic framework membranes that enhance light absorption reduce charge recombination through vertical gradient protonation of imine linkages during acid-catalyzed liquid-liquid interfacial polymerization. This technique creates intralayer interlayer heterojunctions, facilitating hybridization establishing a robust built-in field under illumination. These improvements enable the achieve remarkable transport across extreme concentration gradients (2000:1), with rate approximately 3.2 × 10
Язык: Английский
Процитировано
3
Chemical Science, Год журнала: 2025, Номер unknown
Опубликована: Янв. 1, 2025
A sulfate-binding stiff-stilbene based bis(cyclopeptide) gives rise to 1 : 1, 2 and host–guest assemblies, which can be interconverted by light irradiation acid/base addition.
Язык: Английский
Процитировано
0
ACS Applied Bio Materials, Год журнала: 2025, Номер unknown
Опубликована: Апрель 1, 2025
In-situ fabrication of nucleic acid molecular machines in biological environments is desirable for smart theranostic applications. However, given the complex nature environments, integration multiple functional modules into a coordinated machine remains challenging. Recent advances nanotechnology offer solutions to these challenges. Here, we outline design principles acid–based tailored physiological conditions, drawing on recent examples. We review cutting-edge technologies that facilitate their functionalization settings, particularly presynthesis modifications using unnatural bases and postsynthesis via bioorthogonal chemistry noncovalent interactions. discuss advantages limitations suggest future directions overcome existing
Язык: Английский
Процитировано
0
Advanced Materials, Год журнала: 2025, Номер unknown
Опубликована: Март 30, 2025
Abstract Biological ion channels achieve remarkable permselectivity and cation discrimination through the synergy of their intricate architectures specialized ionophores within confined nanospaces, enabling efficient energy conversion. Emulating such selectivity in synthetic nanochannels, however, remains a persistent challenge. To address this, novel host‐guest assembly membrane is developed by incorporating sodium‐selective into β‐ketoenamine‐linked covalent organic framework (COF). This design confers exceptional Na + selectivity, achieving /K /Li ratios 3.6 103, respectively, along with near‐perfect /Cl − under 0.5 M || 0.01 salinity gradient. Notably, dynamically switches its to favor anion transport presence high‐valent cations (e.g., Ca 2+ ), overcoming limitations as uphill diffusion back currents observed conventional cation‐selective membranes. adaptive behavior yields 4.6‐fold increase output power density ‐rich environments. These findings advance biomimetic nanochannels unparalleled enhanced conversion efficiency.
Язык: Английский
Процитировано
0
Journal of the American Chemical Society, Год журнала: 2025, Номер unknown
Опубликована: Апрель 11, 2025
The modulation of molecular recognition underpins numerous wide-ranging applications and has inspired the development a myriad switchable receptors, in particular photo- or redox-responsive hosts. Herein, we report highly versatile three-state cation receptor family switch system based on an overcrowded alkene strapped with crown ethers, which can be switched by both redox light stimuli, thereby combining advantages approaches. Specifically, neutral switches quantitatively converted between anti- syn-folded geometries irradiation, leading to discovery significant increase decrease binding affinity, was exploited shuttle pseudorotaxane-forming dibenzylammonium guest ethers slightly different sizes. Alternatively, two-electron oxidation orthogonal, dicationic, nonvolatile state completely turns off host, ejecting guest. Upon reduction, metastable is first formed, then thermally relaxes, resulting unique, autonomous, cation-dependent multistate switching cascade.
Язык: Английский
Процитировано
0
Journal of the American Chemical Society, Год журнала: 2025, Номер unknown
Опубликована: Апрель 23, 2025
The removal of anions from aqueous media using molecular receptors in liquid-liquid extraction is a long-standing strategy to clean up contaminated water sources. Therein, high selectivity needed remove specific ions mixtures other ions, and affinity provides extractions at low concentrations. However, the creates conundrum by impeding release any stripping steps for further processing. To circumvent this problem, light-responsive have been proposed as candidates turning off binding, but they are currently untested extraction. We tested feasibility light-driven cyanostar macrocycle. demonstrate selective PF6- over large excesses competing (Cl-, NO3-, SO42-) followed photodriven quantitative isolation target. Release relies on photoisomerization macrocycle's five stilbenes generating distorted isomers turn binding. With modest reversibility, only single-shot was demonstrated, akin uncaging. These methods were extended capture ReO4- radioactive 99TcO4- ∼90% efficiency. Extraction demonstrated down highly dilute 4 ppb levels anion. This proof-of-concept demonstration verifies use change all-to-nothing target between liquid phases.
Язык: Английский
Процитировано
0
Journal of the American Chemical Society, Год журнала: 2025, Номер unknown
Опубликована: Апрель 25, 2025
The length of the linker connecting a photoswitch to material significantly influences latter's properties, with "zero-length" linkers being ideal for optimal photomodulation. 1,2,3-triazole formed through "click" reaction between an azide and alkyne has been used as such linking motif in various areas research spanning from materials biological chemistry. However, its effect, well that regioisomers, on photoswitching properties not fully elucidated. Here, we report series triazole-containing hydrazone photoswitches, investigating how connectivity (1,4 vs 1,5) triazole switch affects properties. structure-property analysis DFT/TD-DFT calculations show switching efficiency N-connected 1,4-triazole hydrazones is lower than their C-connected counterparts, while 1,5-triazole exhibits overall better efficiency.
Язык: Английский
Процитировано
0
ChemSystemsChem, Год журнала: 2025, Номер unknown
Опубликована: Апрель 28, 2025
Abstract Over the past decade there has been a tremendous development of systems capable to autonomously convert energy, in particular light and chemical, into directed motion at nanoscale. These nanoscopic devices are called molecular motors. The autonomous operation artificial motors pumps under constant experimental conditions represents key achievement their implementation more sophisticated networks. Nonetheless, principles behind successful only recently being rationalized. Within this review we focus on fundamental aspects that enable exploiting chemical energy. We also compare mechanisms with these two energy sources highlight common ground as well differences specificities by discussing selection recent examples classes. Finally, provide perspective view future advances exciting research area.
Язык: Английский
Процитировано
0