查看更多>>摘要：Functional organics doped polymers have displayed tunable room temperature phosphorescence(RTP),emerging as promising applications in optical information encryption and organic electronic devices.However,the present doped polymer systems confront a difficulty of constructing a low-cost heavy-atom-free doped systems with ultra-long RTP lifetime and high luminescent efficiency by a facile and environmental-friendly approach,which retards large-scale and commercialized applications.In this work,based on indole derivatives of high quantum efficiency and water-soluble polyacrylamide(PAM)of high H-bond capacity,several kinds of commercialized indole carboxylic acid(ICA),with different extended benzoic acid arms,were respectively combined with PAM based on intermolecular hydrogen bonding by water-promoted dispersion,thereby effectively retarding non-radiative transition.The average RTP lifetimes of 5-ICA/PAM-0.3% and IDCA/PAM-0.3% films could reach 1.997 and 0.992 s respectively at room temperature.Moreover,to adjust the.positions of substituted carboxy groups,the luminescent colors can be tuned from blue to yellowish green.Anti-counterfeiting patterns can be facilely fabricated with ICA-doped PAM by environmental-friendly and low-cost screen printing and brush writing,which gives an insight into commercialized production for information security.
查看更多>>摘要：Recent interests of scientists in the natural dyes for not only textile colouration but also clean production of functional fabric materials,has led to the development and application of ancient nature-based sources of colourants.Historical textiles are considered as important artefacts that present the culture and society from antient time to contemporary centuries,as well as the database to develop the functional materials.Study of organic colourants in ancient textiles is an effective approach to investigate the historical dyeing science and technology,likewise evolve the bio-colourants for modern applications.Plant-based colouring matters were widely utilized since the early textile civilization until the early 20th century.Currently,several anthraquinone colourants are discovered from vegetation,especially the morindone which was widely used in traditional fabric dyeing techniques of Southeast Asia,India and the Pacific Islands.In this context,the principal focus of this study is anthraquinone-based morindone dye,started from a brief overview of natural anthraquinone dyes in historical textiles,followed by the detailed discussion on biological sources,extraction of morindin,modification to red morindone pigment,as well as the summary of mordanting and dyeing method.For intensive investigation of the practical utilization of organic morindone in historical textiles,some recent works using analytical methods including high performance liquid chromatography(HPLC)and surface-enhanced Raman spectroscopy(SERS),are thoroughly discussed.Furthermore,the potential antimicrobial and ultraviolet protective performances of morindone dye are analysed with respect to effective application of morindone in functional textiles.
查看更多>>摘要：Mitochondrial copper is involved in various physiological processes and the dysregulation of mitochondrial copper balance is related to various diseases such as Wilson's disease,Alzheimer's disease and cancer.It is now still a challenge to develop efficient fluorescent sensors for monitoring mitochondrial copper with"turn-on"response due to its inherent paramagnetic quenching effect.In this work,a mitochondria-targeted turn-on fluorescent sensor,CySH,with near-infrared absorption and emission wavelengths,was developed for the selective determination of copper.This probe displays very weak fluorescence at 784 nm due to the photo-induced electron transfer(PET)effect.After the sulfhydryl on the middle position of cyanine is coordinated with copper,the quenching process of PET is inhibited and the fluorescence of probe CySH is turn-on.CySH exhibits high selectivity towards copper and excellent anti-interference ability.Job's plot and high resolution mass spectrometry verified the stoichiometric ratio of 2:1 between CySH and Cu~(2+).The probe could penetrate the cell membrane well and was utilized to monitor the fluctuation of labile copper in mitochondria.Furthermore,CySH has been successfully used to assess mitochondrial copper variations in copper-overload HepG-2 cells.The proposed feature of the single S-donor might offer a new stratregety for the turn-on fluorescence detection of copper.
查看更多>>摘要：In this work,we have designed and synthesized for the first time a series of red/near-infrared chromenoqui-noline-based fluorescent dyes.These dyes show long wavelength emission(600-821 nm),large stokes shift and good photostability.It was shown that these newly developed dyes are capable of being used in LEDs,as well as in bioimaging of live cells and zebrafish.Importantly,the near-infrared chromenoquinoline dye can be used as targeting probe for mitochondria with good labeling properties.
查看更多>>摘要：Due to the focus on the development of environment-friendly and hygienic textiles,a novel and sustainable approach was adopted to functionalize acid dye for cotton dyeing to develop durable antibacterial and ultraviolet protective fabric.Functionalization of commercial acid dye was carried out by incorporation of triazine reactive system and antibacterial agent(chloroxylenol)into dye structure.The modified bioactive reactive dye was characterized by ~1H NMR,~(13)C NMR,FTIR,and UV-Vis spectroscopy.The exhaust dyeing approach was used for the application of dye on cotton.Antibacterial efficacy of modified dye powder and dyed fabric against Escherichia coli and Staphylococcus aureus was evaluated quantitatively and qualitatively following standard testing protocols.Fastness properties,levelness of dye,colorimetric data(L*,C* a*,b*,H*),and color strength(K/S)of dyed cotton fabric were also assessed.The dye exhibited remarkable antibacterial potential with 99.9% bacterial growth reduction with nearly the same results after 20 industrial laundering cycles.Ultraviolet Protection Factor(UPF)of dyed unwashed and washed fabric,measured according to standard AATCC-183,was>100.The dyed fabric showed good durability to light,washing,and rubbing fastness.The excellent antibacterial potential and remarkable durability to washing is due to the incorporation of chloroxylenol and triazine reactive system in acid dye structure.Thus,the development of such functional reactive dyes with durable antibacterial activity will be fruitful in the future in terms of sustainability for desired applications.Moreover,all commercially available acid dyes can be made reactive for functional dyeing of cotton by adopting this route.
查看更多>>摘要：Four new 9-thienylanthracene fluorescent dyes(TAs)bearing 1-methylindole/triphenylamine moieties were successfully synthesized.They all displayed typical aggregation-induced emission enhancement(AIEE)features with bright and varying aggregative-state emission involving multiple fluorescence colors containing cyan,green,and jacinth.Meanwhile,their solid state fluorescence could be effectively switched by mechanical grinding and dichloromethane fuming except for TPATA-Py12.Specifically,ITA,TPATA and ITA-Py12 showed reversible high contrast mechanofluorochromic(MFC)behaviors involving distinct fluorescent color changes from cyan/yellow to green/red.Notably,these TA dyes displayed excellent biocompatibility and have been successfully realized in living cell imaging.Particularly,ITA-Py12 and TPATA-Py12 can steadily immobilize in the mitochondria of HeLa cells by strong hydrophobic interaction between the C12-alkyl chain and lipid bilayer,resulting in high specificity mitochondrial staining.These good properties of them could provide a reference for the design and development of multi-functional AIEE dyes based on TA-skeleton.
查看更多>>摘要：Developing highly efficient red emitters with emission beyond 600'nm is full of challenges for organic light-emitting diodes(OLEDs).Herein,two novel red isomers of 11-DTPA-BBI and 3-DTPA-BBI manifesting hybridized local and charge-transfer(HLCT)state were designed and synthesized,based on triphenylamine(TPA)as donor and 7H-benzo[de]benzo[4,5]imidazo[2,l-a]isoquinolin-7-one(BBI)as acceptor.The charge-transfer(CT)component in HLCT state ensures their red emission and high excitons utilization,while the locally excited(LE)component guarantees the high fluorescence radiative rate.Further,the non-radiative transition is suppressed through regulating molecular vibration modes by isomer engineering,resulting in the high fluorescence quantum efficiency of 53% for 3-DTPA-BBI.Consequently,a maximum external quantum efficiency of 3.0% is achieved with emission peak at 604 nm in 3-DTPA-BBI based OLEDs.This contribution demonstrates a comprehensive structure-property relationship which may provide an effective guidance to design high performance red electroluminescent emitters.
查看更多>>摘要：A novel trichromophoric molecular chemosensor Rh-NI-Hz was designed,synthesized and examined f<detection.It exhibited naked eye observed colorimetric and fluorometric responses to lower and high pH v The probe sensitivity towards an acidic environment was achieved through the rhodamine part of the mo] where the colour was changed from colourless to red and yellow fluorescence was emitted.On the other ha:a basic environment,the colour was changed to yellow and a green fluorescence emission was prod Moreover,the probe mimics a digital comparator by executing three INHIBIT logic gates using H+ and H<chemical inputs.
查看更多>>摘要：Two benzo[1,2-b:4,3-b']dithiophene-pyridine-based bent shaped isomers(3BDTPy12 and 4BDTPy12)have been synthesized via Suzuki coupling reactions as key steps.They differ themselves in the position of N-atom on the pyridine unit which has generated significant effect on their self-assembly behavior and photophysical properties.4BDTPy12 with N in the para position in the pyridine ring can self-assemble into a columnar liquid crystalline phase while its isomer 3BDTPy12 with N in the meta position in the pyridine ring is only a crystal.Both compounds can form gels in different organic solvents but with different morphologies.The influence of the solvent polarities and doping agents including chiral L-phenylalanine(L-Phe),trifluoroacetic acid as well as L-tartaric acid on their gel morphologies were also studied.The gel of 4BDTPy12 doped with L-tartaric acid could produce enhanced yellow emission which can be used to generate WLED,and such compounds can be used as chemosensors towards volatile acid-base vapors with good reversibility.
查看更多>>摘要：Donor(D)-acceptor(A)type compounds have drawn significant attraction recently due to their large Stokes shifted emission and easy-tunable emissive behaviour.Herein,a new family of D-A type[2.2]paracyclophanyl 4H-pyran-4-one fluorescent molecules(3a-3d)have been rationally designed and easily synthesized,and they exhibited intensity and wavelength-based fluorescence sensing in response to active hydrogen,polarity,viscosity and acidic/basic vapours.Therefore,visual and quantitative detection of trace water in different organic solvents with low detection limits of 1.39-8.75 ppm were achieved for 3c; Fluorescence ratiometric detection of pH in the range of 2-7 was achieved for 3b.Moreover,3a-3d could be served as coated test strips for detecting acidic gases(HC1,TFA,HCOOH and SO2)and HCHO with high sensitivity,reversibility,reproducibility and long-time stability.The response times to TFA vapour were 3-5 s,to HCOOH vapour were 5-7 s and to HCHO vapour 32-70 s.These processes could be readily visualized by unaided eye detection under day light and UV-irradiation.Furthermore,the sensing mechanisms were elucidated by X-ray diffraction,NMR and TD-DFT calculations.The present results suggest that the coated test strips of 3a-3d have potential applications in data encryption and decryption and anti-counterfeiting fields.
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