查看更多>>摘要：There is currently great interest in developing an environment-friendly,low-cost,and scalable approach for producing stimuli-responsive fluorescent hydrogels(FHs)with excellent mechanical property,rewritable fluo-rescence,and dual anti-counterfeiting capabilities.Herein,by applying natural,environment-friendly,and sus-tainable curcumin as a responsive agent,tough pH-responsive FHs(pH-FHs)are fabricated via a facile preparation strategy.These materials have outstanding mechanical performances:ultimate stress of 180 kPa,an ultimate strain of～2500％,and good anti-fatigue performances against compression.These pH-FHs are able to sense ammonia and formaldehyde gas,resulting in both a color change and fluorescence for dual anti-counterfeiting functionality.This sensing information is stored individually by the pH-FHs and could be externally removed using formaldehyde gas to achieve a rewritable system.Our study provides valuable insights that are expected to facilitate the development of smart FHs for information encryption and anti-counterfeiting applications.
查看更多>>摘要：Lipid droplets(LDs)are dynamic organelles interacting with a variety of intracellular organelles.Tracking intracellular LD dynamics employing synthetic small molecules is crucial for biological studies.Fluorescence imaging in the red and near infrared(NIR)region is more suitable for biological imaging due to its low photo-toxicity and high signal-to-noise ratio.However,available LD-dyes in the red region with remarkable environ-mental sensitivity,selectivity for LDs staining are limited.Here,we constructed a red-emission D-π-A-π type LD-dye LD 688P with higher environmental sensitivity and suitable"calculated log P"(Clog P)for LDs dynamic imaging.LD 688P was proved to be highly selective and photostable for tracing LD fusion including multiple consecutive fusions and fusions in a centrosymmetric manner by super-resolution microscopy.We believe that the D-π-A-π skeleton would be an efficient strategy to construct red and even NIR-emission dyes.
查看更多>>摘要：Improving light-harvesting efficiency and suppressing interfacial charge recombination are of paramount importance to the development of Cu(Ⅱ/Ⅰ)redox shuttle-based dye-sensitized solar cells(DSSCs).Here,we present a rational molecular engineering on D-A-π-A organic sensitizers featuring with fluorenyl-substituted bulky donor(HY57,HY60,and HY61)for Cu(Ⅱ/Ⅰ)mediated DSSCs.By gradually enhancing conjugation and rigidity of the π-spacer and auxiliary acceptor moieties,the light-harvesting and electron-injection efficiencies can be simultaneously improved.The large size of fluorenyl-substituted arylamine donor together with abundant alkyl chains decorated on the molecular structures assist dense assembly of dye monolayer at surface of nanocrystalline TiO2,which largely suppress interfacial charge recombination losses.When applied in Cu(Ⅱ/Ⅰ)mediated DSSCs,the combination of an auxiliary acceptor of phenanthrene-fused-quinoxaline(PFQ)and a π-spacer of cyclo-pentadithiophene(CPDT)in dye HY61 results in a simultaneous enhancement in short-circuit current(Jsc)and open-circuit voltage(Voc),thus improving the power conversion efficiency(PCE)from 7.3％for reference dye HY59 to 10.3％for HY61.This study demonstrates that rigid and fused building block is promising towards constructing highly efficient organic sensitizers.
查看更多>>摘要：Recently,nano theranostics,by integrating diagnostic and therapeutic functions into a nano system,have pro-vided increasing opportunities for the design of personalized medicine in cancer.Among the construction method of various theranostic nano systems,the design of single component nanoparticles which are composed of organic photosensitive dyes has become a promising approach to constructing multifunctional nano-theranostic systems,thanks to its unique advantages such as defined structure,100％loading,and high repeatability.Specifically,depending on the inherent photonic imaging and therapeutic properties of the photosensitive dyes,the multi-functional purpose which integrates theranostic effects and targeting abilities can be realized via reasonable molecular modification and supramolecular assembly.In this review,recent advances in the development of nanostructured self-assemblies of porphyrins,phthalocyanines,and boron-dipyrromethanes for theranostics are summarized.Emphasis on their design consideration and theranostic applications are presented.Additionally,prospects for clinical practice and potential challenges of this rapidly growing field are also provided.
查看更多>>摘要：Cell wall is a basic component of bacteria that promotes bacteria to adapt the complicated environment as well as play an essential role in antimicrobial resistance.The structure of bacterial cell wall is remarkably rich,and some complex components,such as peptidoglycan,lipopolysaccharide,and peptidoglycan-arabinogalactan et al.,can only be found in bacteria.Furthermore,the biosynthesis and transfer of these glycolipids are indispensable for bacteria during cell elongation.And the process of biosynthesis and transfer are generally associated with metabolism and sophisticated enzyme mechanisms.However,how the metabolic process takes place,what role enzymes play in this process and how they function have been major concerns for scientists in this field.Numerous significant progresses on fluorescent probes and biological imaging bring opportunity for the studying of metabolism and enzyme mechanisms recently due to its non-invasive and high sensitivity.In this review,we focused on metabolic fluorescent probes for the detection of glycolipids in bacterial cell wall and highlighted the involving mechanisms and biological application.
查看更多>>摘要：Rapid,selective,and quantitative profiling of SO32-is a prerequisite for investigating its effect on different physiopathological processes.To address this challenge,our team prepared a ratiometric fluorescent probe HBTC-S,based on 4-(benzothiazol-2-yl)-3-hydroxybenzaldehyde for specific detection of SO32-under a single-wavelength excitation.The solution of probe HBTC-S itself exhibited orange fluorescence(λem=614 nm),and became green fluorescent(λem=471 nm)after the addition of SO32-.The vitro experiments suggested that the probe displayed high sensitivity,excellent selectivity,and a low detection limit(0.15 pM).Moreover,probe HBTC-S was successfully applied for qualitative and quantitative monitoring of SO32-in realistic samples and living HeLa cells in a ratiometric manner.
查看更多>>摘要：Solar-driven photoreduction of CO2 to value-added fuels such as CO,CH4,and CH3OH is a promising approach for alleviating the greenhouse effect.Transition-metal-complex molecular catalysts exhibit high catalytic perfor-mance for CO2 reduction owing to their tunable structures.In this study,we developed an efficient,inexpensive,and noble-metal-free photocatalytic CO2 reduction system containing an organic photosensitizer proflavine,a cobalt molecular catalyst,and an organic electron transfer relay emodin in DMF/H2O(DMF:N,N-dime-thylformamide)solvent.In the presence of water,a turnover number(TON)of 1333 was achieved for CO2-to-CO conversion under ambient conditions and visible light irradiation,which is a 1.7-fold improvement over the system without emodin.In addition,a high selectivity of 90％was obtained for CO production.Absorption spectroscopy and cyclic voltammetry confirmed the crucial role of emodin in facilitating electron transfer between the photosensitizer and catalyst.We expect that our system will promote the development of an effective ho-mogenous photocatalytic solar-fuel production technology.
查看更多>>摘要：NH2-MIL-125(Ti)is a Ti-MOFs(MOFs:metal-organic frameworks)with high adsorption properties and is therefore widely used for wastewater purification.However,the powdered MOF material suffers from the dis-advantages of being difficult to separate and being potentially wasted due to easy agglomeration,which limits its application in practical applications.Here,a mesoporous Ti-MOF/polymer(PEG,PVA,and PAM)monolithic material was prepared by freeze casting in liquid nitrogen(-196 ℃)as an adsorbent for wastewater remediation.The composites could be easily picked up with tweezers and used for recovery tests.Characterization results such as XRD,BET,FT-IR,and SEM proved the successful synthesis of Ti-MOF/polymer.Adsorption tests using 100 mg/L methylene blue(MB)simulated wastewater showed that the Ti-MOF/PEG monolithic material had the best adsorption capacity.The order of adsorption was Ti-MOF@PEG10(747.4 mg/g)＞Ti-MOF@PVA10(687.4 mg/g)＞Ti-MOF@PAM10(633.7 mg/g)＞NH2-MIL-125(Ti)(571.4 mg/g).The effects of polymer dosage,different pollutants(methylene blue,methyl orange,indigo,actual textile wastewater),pH,anions,and cations on the adsorption effect of Ti-MOF/polymer were also investigated.It was demonstrated that all the above pollutants were well adsorbed by this Ti-MOF/polymer in the pH range 3-9.The adsorption isotherms and kinetic data are fully consistent with the Langmuir and pseudo-secondary models.This suggests that the adsorption between the pollutant and the adsorbent is a chemical interaction.Thermodynamic studies indicate that the adsorption process is exothermic and spontaneous.This work provides the potential methods to fabricate Ti-MOF/polymer monolith to avoid the pollution from powdery adsorbents that could be practical applications.
查看更多>>摘要：The development of aggregation-induced emission luminogens(AIEgens)with high brightness and efficient photodynamic therapy(PDT)is of great value for the precise diagnosis and treatment of cancers.In this contri-bution,two novel AIEgens,TBBCyP and TBTCyP with D-A-π-A structure,were designed and prepared based on molecular rational design of electron-donating receptors.Experimental and theoretical results indicated that both TBBCyP and TBTCyP own bright AIE feature,satisfy photos ability,and generate efficient singlet oxygen(1O2).Notably,TBBCyP exhibited brighter emission and higher 1O2 yield in compared with TBTCyP,which could be ascribed to its weaker twisted intramolecular charge transfer(TICT)effect and narrower singlet-triplet energy gap(△EST).Moreover,it was proved that TBBCyP and TBTCyP showed a great mitochondrial specificity and desired intracellular ROS productivity for realizing the effective mitochondria-targeted PDT of cancer cells.
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