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NIR-Ⅱ Excitation and NIR-I Emission Based Two-photon Fluorescence Lifetime Microscopic Imaging Using Aggregation-induced Emission Dots

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Chemical Research in Chinese Universities 2021年第1期37卷 171-176页

作者： LIU Wen ZHANG Yuhuang QI Jj QIAN Jun tang ben zhong State Key Laboratory of Modern Optical Instrumentations Centre for Optical and Electromagnetic ResearchCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityHangzhou310058P.R.China Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of TechnologyGuangzhou510640P.R.China Department of Chemistry The Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionInstitute for Advanced Study and Department of Chemical and Biological Engineering and Institute of Molecular Functional MaterialsThe Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongP.R.China

Near-infrared(NIR)lights are powerful tools to conduct deep-tissue imaging since NIR-Ⅰ wavelengths hold less photon absorption and NIR-Ⅱ wavelengths serve low photon scattering in the biological tissues compared with visible ***-photon fluorescence lifetime microscopy(2PFLM)can utilize NIR-Ⅱ excitation and NIR-Ⅰ emission at the same time with the assistance of a well-designed fluorescent *** induced emission(AIE)dyes are famous for unique optical properties and could serve a large two-photon absorption(2PA)cross-section as aggregated ***,we report two-photon fluorescence lifetime microscopic imaging with NIR-Ⅱ excitation and NIR-Ⅰ emission using a novel deep-red AIE *** AIE-gens held a 2PA cross-section as large as 1.61×10^(4)GM at 1040 *** AIE dots had a two-photon fluorescence peak at 790 nm and a stable lifetime of 2.2 ns under the excitation of 1040 nm femtosecond *** brain vessels of a living mouse were vividly reconstructed with the two-photon fluorescence lifetime information obtained by our home-made 2PFLM *** vessels as small as 3.17µm were still observed with a nice signal-background ratio at the depth of 750µ*** work will inspire more insight into the improvement of the working wavelength of fluorescent agents and traditional 2PFLM.

关键词： Near-infrared Brain imaging Aggregation-induced emission Two-photon fluorescence lifetime microscopic imaging

Bioapplications Manipulated by AIEgens with Nonlinear Optical Effect

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Chemical Research in Chinese Universities 2021年第1期37卷 25-37页

作者： HAO Yuxuan XU Shengpeng CHEN Ming QIAN Jun tang ben zhong College of Chemistry and Materials Science Jinan UniversityGuangzhou510632P.R.China Department of Chemistry The Hong Kong University of Science and TechnologyKowloonHong KongP.R.China College of Optical Science and Engineering Zhejiang UniversityHangzhou310058P.R.China

The modern medicine requires precise diagnostic techniques while the fluorescent imaging shows great potential in such applications due to its excellent sensitivity and high ***,conducting fluorescent imaging in deep-tissue is not so easy because most luminogens show short-wavelength excitation,which may undergo severe light scattering by the *** marriage of fluorescent imaging with nonlinear optical(NLO)effect can alleviate such adverse effects by utilizing NIR laser to reduce light *** the other hand,scientists are enthusiastic in pursuing luminescent materials,which can match well with NLO ***-induced emission(AIE)materials exhibit huge advantages in such aspect not only because of its high luminescent efficiency in aggregate state but also due to its excellent photo-stability(a key factor to meet laser application because of its ultrahigh energy density).Inspired by this,many interesting and meaningful works have sprung up based on AIE luminogens with NLO effect in recent years,and for such reason,it motivates us to summarize them to give a systematic ***,we first give a brief introduction of the principle of NLO ***,the strategies for improving the NLO effect of AIE materials,such as increasing molecular conjugation,introduction of donor-acceptor effect,induction of centrally asymmetric array of AIE molecules in crystals and introduction of intermolecular interactions are *** the final part,we also present the multiple applications of AIEgens with NLO effect in cell imaging,deep-tissue tumor and brain blood vessel imaging and photodynamic *** believe,with this review,the topic will attract more attention from the scientists in multi-science field to accelerate the development of AIE materials in biomedical applications.

关键词： Aggregation-induced emission Nonlinear optical effect Bioimaging Photodynamic therapy

Thiol-yne click polymerization

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Chinese Science Bulletin 2013年第22期58卷 2711-2718页

作者： YAO BiCheng SUN JingZhi QIN AnJun tang ben zhong MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University Department of Chemistry Institute for Advanced StudyInstitute of Molecular Functional MaterialsThe Hong Kong University of Science & Technology

The research on using thiol-ene click reaction to synthesize sulfur-containing polymers with topological structures and advanced functional properties is a hot topic. However, the application of the thiol-yne reaction in the functional polymer preparation is limited and the thiol-yne click polymerization is to be further developed. In this review, we summarized recent research efforts on using thiol-yne click polymerization to synthesize polymers with topological structures. The sulfur-containing polymers were facilely prepared by photo-and thermo-initiated, amine-mediated, and transition-metal-catalyzed thiol-yne click polymerizations. These polymers are promising to be used as drug-delivery vehicles, high refractive index optical materials, photovoltaic materials, and biomaterials etc.

关键词：含硫聚合物巯基过渡金属催化拓扑结构反应合成合成聚合物功能特性应用程序

Synthesis and Characterization of Polystyrene/Nanosilica Organic-Inorganic Hybrid

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Chemical Research in Chinese Universities 2006年第6期22卷 797-802页

作者： YUAN Wang-zhang PENG Mao YU Qiu-ming tang ben-zhong ZHENG Qiang Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 P. R. China National Engineering Research Center for Compounding and Modification of Polymer Materials Guiyang 550025 P. R. China Department of Chemistry Hong Kong University of Science and Technology Kowloon Hong Kong P. R. China

A polystyrene（PS）/nanosilica organic-inorganic hybrid material was prepared from styrene monomer and commercial aqueous silica sol containing large amounts of Si-OH by means of emulsion polymerization. The nanosilica sol was modified by the addition of the reactive coupling agent methacrylexy propyltrimethoxysilane （ MPS）, and the resulting latex particles were protected by surfactants such as sodium dodecyl sulphonate（ SDS）, hydroxypropyl methyl cellulose （ HMPC）, and poly （vinylpyrrolidone）（PVP）. The effects of the type of surfactant, the amount of surfactant, and the coupling agent on the shape and stability of the resulting latex particles were investigated. The TEM observation indicates that among SDS, HMPC, and PVP, SDS is the best surfactant. When the content of SDS is 0. 5% and the amount of MPS is 7% in the system, the latex with obvious core-shell structure could be obtained. The average diameters of the monodispersed particles range from 182 to 278 nm, and the average number of silica beads for each composite are 1325 and 4409, respectively. The FrIR analysis shows that PS was chemically linked to silica through MPS. The thermal gravimetric analysis shows that when there is a higher silica content, the hybrid composites have a better heat resistance.

关键词： Commercial aqueous silica sol Organic-inorganic hybrid particle Core-shell latex 1005-9040 (2006) -06-797-06

Restriction of Intramolecular Motion(RIM):Investigating AIE Mechanism from Experimental and Theoretical Studies

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Chemical Research in Chinese Universities 2021年第1期37卷 1-15页

作者： ZHANG Jianyu ZHANG Haoke LAM Jacky W.Y. tang ben zhong Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration and ReconstructionInstitute for Advanced Studyand Department of Chemical and Biological EngineeringThe Hong Kong University of Science&TechnologyClear Water BayKowloonHong KongP.R.China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou310027P.R.China Center for Aggregation-Induced Emission SCUT-HKUST Joint Research InstituteState Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou510640P.R.China Guangzhou Development District AIE InstituteGuangzhou510530P.R.China

Mechanistic studies promote scientific development from phenomena to ***-induced emission(AIE),as an unusual photophysical phenomenon,builds the bridge between molecular science and aggregate *** the twenty-year development of AIE,restriction of intramolecular motion(RIM)has been verified as the working mechanism of AIE *** this review,these mechanistic works about RIM are summarized from experimental and theoretical ***,the experimental studies are introduced from three parts:external rigidification,structural modification and structural *** the theoretical part,calculations on the low-frequency motion of AIEgens have been performed to prove the RIM *** virtue of the theoretical calculations,some new mechanisms are proposed to supplement the RIM,such as restriction of access to conical intersection,suppression of Kasha transition,restriction of access to dark state,*** is foreseeable that the RIM mechanism will unify the photophysical theories for both molecules and aggregates,and inspire more progress in aggregate science.

关键词： Aggregation-induced emission(AIE) Restriction of intramolecular motion Photophysical mechanism Aggregate science

Probing the pH-dependent chain dynamics of poly(acrylate acid) in concentrated solution by using a cationic AIE fluorophore

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Science China Chemistry 2013年第9期56卷 1253-1257页

作者： ZHANG Shuang YAN JiMing QIN AnJun SUN JingZhi tang ben zhong MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University Department of Chemistry The Hong Kong University of Science & Technology

We report a novel strategy to study the chain dynamics of poly(acrylic acid) (PAA) in a relative concentrated solution (1.0 g/L). The strategy is based on the fluorescent probe (DCTPE) with unique aggregation-induced emission (AIE) characteristics. Free DCTPE molecules are non-emissive in aqueous solution, but they become highly emissive when trapped in polymer coils. The fluorescence intensity is proportional to the efficiency of trapping DCTPE molecules in polymer coils. By correlation the change of fluorescence intensity with the variation of pH value (from 1.78 to 12.06), the PAA chain's dynamics in the relatively concentrated solution have been elucidated into three processes. In the pH range from 12.06 to 6.0, PAA chains take an extended and non-folding conformation. Changing pH from 6.0 to 3.86, PAA chains are partially protonated and loosely packed polymer coils are formed. Further lowering the pH value of the solution (from 3.86 to 1.78), protonated segments dominate the PAA chains, and at the same time, the intermolecular hydrogen bonding takes effect, thus the polymer chains posses in the conformation of more compact coils.

关键词： polyelectrolyte polymer dynamics coils concentrated solution aggregation-induced emission

New tetraphenylpyridinium-based luminogens with aggregation-induced emission characteristics

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Science China Chemistry 2013年第9期56卷 1187-1190页

作者： WANG ZongTan FANG Yuan SUN JingZhi QIN AnJun tang ben zhong MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University Department of Chemistry Institute for Advanced StudyInstitute of Molecular Functional MaterialsThe Hong Kong University of Science & Technology (HKUST) Guangdong Innovative Research Team SCUT-HKUST Joint Research LaboratoryState Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology (SCUT)

The research on aggregation-induced emission (AIE) has drawn increasing interests in the past decade. With the efforts scientists paid, a variety of AIE systems have been developed, among which the tetraphenylethelene and silole derivatives are the most studied. Development of new AIE systems could further enrich the AIE molecules and promote the development of AIE area. In this communication, we prepared a new AIE system based on 1,2,4,6-tetraphenylpyridinium ions according to the restriction of intramolecular rotation mechanism. These molecules could be facilely synthesized via one-step and one-pot reaction. The ionic AIE-active molecules could find wide application in sensing and optoelectronic areas.

关键词： aggregation-induced emission cation restriction of intramolecular rotation tetraphenylpyridinium

Delayed Fluorescence and Amplified Chirality via Modified Substitution Position for Deep-red Circularly Polarized Organic Light Emitting-diodes

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Chemical Research in Chinese Universities 2024年第4期40卷 657-663页

作者： ZHU Lixun LIU Dan WU Kaiwen XIE Guohua ZHAO Zheng tang ben zhong School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhen(CUHK-Shenzhen)Shenzhen518172P.R.China Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionThe Hong Kong University of Science and TechnologyHongkong999077P.R.China The Institute of Flexible Electronics(Future Technologies) Xiamen UniversityXiamen361005P.R.China

Developing easily accessible deep-red/near-infrared circularly polarized emitters for practical organic light-emitting diodes remains a significant ***,a practical strategy has been proposed for developing deep-red circularly polarized delayed fluorescent emitters based on a novel chiral acceptor *** changing triphenylamine(TPA)substitution position from para to meta,R/S-M-TBBTCN demonstrated thermally activated delayed fluorescence(TADF)properties with a delayed lifetime of 6.6µs that R/S-P-TBBTCN doesn’t ***,R/S-M-TBBTCN showed a 65 nm red-shift in emission and a 10-fold enhancement in asymmetry factor(glum),compared with R/*** solution-processed nondoped circularly polarized organic light-emitting diodes(CP-OLEDs)based on R-M-TBBTCN display deep-red emission and 2.2%external quantum efficiency.

关键词： Amplified chirality Deep-red circularly polarized organic light emitting-diode Binaphthol based chiral acceptor

Themed Issue on Aggregation-induced Emission

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Chemical Research in Chinese Universities 2021年第1期37卷 I0001-I0002页

作者： ZHANG Haoke tang ben zhong Zhejiang University| Hong Kong University of Science and Technology&South China University of Technology

Twenty years of aggregation-induced emission(AIE)research has witnessed the flourishing development of aggregate-related disciplines(ie,solid-state emitters).From photophysical mechanisms to structural frameworks and thence to functional applications,AIE systems possess many unique and superior characteristics compared to the traditional structures with detrimental aggregation-caused quenching(ACQ)effct.

关键词： aggregation aggregate quenching