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how temperature and hydrostatic pressure impact organic room temperature phosphorescence from h-aggregation of planar triarylboranes and the application in bioimaging

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Science China Chemistry 2023年第3期66卷 816-825页

作者： Liangjing Tu Yuanyuan Fan Changjiang Bi Leyi Xiao Yonggang Li Aisen Li Weilong Che Yujun Xie Yufeng Zhang Shuping Xu Weiqing Xu Qianqian Li Zhen Li Institute of Molecular aggregation Science Tianjin UniversityTianjin 300072 China hubei Key Lab on Organic and Polymeric Opto-Electronic Materials Department of ChemistryWuhan UniversityWuhan 430072China State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China School and hospital of Stomatology Wuhan UniversityWuhan 430079China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Binhai New CityFuzhou 350027China Tianjin Key Laboratory of Molecular Optoelectronic Sciences Tianjin UniversityTianjin 300072China

highly efficient persistent organic room temperature phosphorescence(RTP) has attracted increasing attention because of promising applications in fields of chemical sensors, optoelectronic devices, information security, and bioimaging, etc. Wherein,the crystal engineering of h-aggregation offers stabilization for long-lived triplet exciton for RTP, but the related research is rare because of the scarcity of ideal phosphorescent h-aggregate. herein, we designed planar tricoordinate organoboron derivatives with molecular arrangement in ideal h-aggregation. The integration of Br atom can largely enhance RTP efficiency through increasing SOC effect, while the antiparallel molecular arrangement causes annihilation of triplet exciton. Thanks to good selfassembly property, their RTP can even be observed in PMMA matrix with doping ratio of merely 1 wt%. We further found that the cryogenic temperature contributes to stabilizing triplet exciton in h-aggregation, leading to red-shifted phosphorescence. By applying high hydrostatic pressure, the phosphorescence was largely enhanced and redshifted, demonstrating the crucial role of h-aggregation on RTP property. In phosphorescent tissue imaging of live mouse, nanoparticles of BrBA exhibited high contrast image via eliminating the interference of autofluorescence.

关键词： room temperature phosphorescence h-aggregation planar triarylboranes bioimaging

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h-and J-aggregation of conjugated small molecules in organic solar cells

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Journal of Energy Chemistry 2024年第6期93卷 174-192,I0005页

作者： Qiaoqiao Zhao Feng he State Key Laboratory of Biobased Material and Green Papermaking Qilu University of TechnologyShandong Academy of SciencesJinan 250353ShangdongChina Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and TechnologyShenzhen 518055GuangdongChina Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and TechnologyShenzhen 518055GuangdongChina

As h-and J-aggregation receive more and more attention in the research of organic solar cells(OSCs),especially in small molecular systems,deep understanding of aggregation behavior is needed to guide the design of conjugated small molecular structure and the fabrication process of OSC *** this end,this review is ***,the review firstly introduced the basic information about h-and J-aggregation of conjugated small molecules in ***,the characteristics of h-and J-aggregation and the methods to identify them were ***,it reviewed the research progress of h-and J-aggregation of conjugated small molecules in OSCs,including the factors influencing h-and J-aggregation in thin film and the effects of h-and J-aggregation on OPV performance.

关键词： h-aggregation J-aggregation Organic solar cells Small molecules Efficiency Stability

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A synergetic strategy of NIR-Ⅱ squaraine dyes with ultrahigh photothermal conversion efficiency for photothermal therapy

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Science China Chemistry 2024年第2期67卷 612-621页

作者： Yigang Wang Guomin Xia Junhui Wang Mingda Wang Weihan Guo Manman Tan Leilei Si Yang Yang hua Wang hongming Wang Institute for Advanced Study and School of Chemistry and Chemical Engineering Nanchang UniversityNanchang330031China State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China The Second Affiliated hospital of Nanchang University Nanchang330031China

Recent research on photothermal therapy(PTT) has sparked significant interest in the development of new organic photothermal agents(PTAs),ranging from single-molecule to aggregated ***,controlling aggregation pathways for PTAs with ultrahigh photothermal conversion efficiency(PCE) remains a major ***,a two-pronged approach utilizing “haggregation” and “intramolecular motion” was employed to enhance the PCE of an acceptor-substituted squaraine dye(NSQs).The C2vmolecular symmetry of the NSQs,which possess a ground state dipole moment(μg),promotes h-dimeric aggregates through dipole-dipole *** triphenylethylene or diphenylamine groups were added to this h-dimeric *** was done to enhance intramolecular motions for heat generation and also to extend conjugation,which redshifted the optical absorption and balanced the blue-shift induced by *** this technique,an organic PTA with NIR-II absorption was developed,and its nanoparticle achieved a remarkable PCE of 86.3% under 1,064 nm laser *** transient absorption spectroscopy and quantum mechanical calculations demonstrated the accelerated internal conversion process in NIR-II PTAs for rapid heat *** NSQs nanoparticles exhibit superior photothermal therapeutic properties for in vivo photoacoustic imaging-guided PTT,demonstrating the potential of bottom-up design to enable synergistic engineering strategies towards efficient phototheranostic agents.

关键词： squaraine dyes second near-infrared window h-aggregation intramolecular motion photothermal therapy

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Ultalong nanowires self-assembled from a[b]-bisphenanthrene-fused azadipvrromethene

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Chinese Chemical Letters 2021年第3期32卷 1249-1252页

作者： Wanle Sheng Zhangcui Wang Erhong hao Lijuan Jiao Department of Chemistry Bengbu Medical CollegeBengbu 233030China The Key Laboratory of Functional Molecular Solids Ministry of EducationSchool of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China

The 1 D microwires based onπ-extended azaBODIPY were successfully prepared and characterized for the first *** bisphenanthrene-fused azaBPP-12 C with four hydrophobic chains was prepared through de novo synthesis method involving the Suzuki reaction and subsequent oxidative ring-fused *** microwires and aggregation behavior were studied using SEM,XRD and absorption ***,an h-ty pe aggregation was confirmed in the solution process.

关键词： AzaBODIPY Self-assembly h-aggregation Nanowireπ-Extended

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Subtle structure tailoring of metal-free triazine luminogens for highly efficient ultralong organic phosphorescence

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Chinese Chemical Letters 2019年第11期30卷 1935-1938,F0003页

作者： Xuan Wang Nan Gan Mingxing Gu Kun Ling Chaoqun Ma huili Ma Wei Yao Yujian Zhang huifang Shi Zhongfu An Wei huang Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Jiangsu National Synergistic Innovation Center for Advanced Materials(SICAM)Nanjing Tech University(Nanjing Tech)Nanjing 211816China Department of Materials Chemistry Huzhou UniversityHuzhou 313000China Shanxi Institute of Flexible Electronics(SIFE) Northwestern Polytechnical University(NPU)Xi'an 710072China

Ultralong organic phosphorescent materials have invoked considerable attention for their great potential in sensing,data encryption,information anti-counterfeiting and so ***,effective ways to achieve highly efficient ultralong organic phosphorescence(UOP)in metal-free organic materials remain a great ***,we designed three isomers based on asymmetric triazines with various bromine substituted ***,phosphorescence efficiency of p-BrAT in solid state can reach up to 9.7%with a long lifetime of 386 ms,which was one of the highest efficient UOP materials reported so *** calculations further demonstrated that para-substitution exhibited the most effective radiative transition for triplet *** results will provide an effective approach to achieving highly efficient UOP materials.

关键词： Ultralong organic phosphorescence(UOP) Isomerism Crystal engineering h-aggregation Intermolecular interactions

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C─h···πinteraction induced h-aggregates for wide range water content detection in organic solvents

Aggregate

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Aggregate 2024年第4期5卷 269-278页

作者： Jiajun Xu Meifen huang haijun Pang Zhehui Weng Guangzhi hu Siman Zhang Qiuling Yang Qiong Wu Department of Chemical Science and Technology Kunming UniversityKunmingChina College of Physics Science and Technology Kunming UniversityKunmingChina The School of Material Science and Chemical Engineering Harbin University of Science and TechnologyHarbinChina Institute for Ecological Research and Pollution Control of Plateau Lakes Yunnan UniversityKunmingChina

J-aggregation and h-aggregation are identified as two classical models of function-ally oriented non-covalent interactions,and significant attention has been drawn by ***,due to the scarcity of single-crystal examples of h-aggregation,a comprehensive understanding of the relationship between its stacking mode and optical behaviour has been *** recent studies,two polyaromatic Schiff base compounds,Cl-Salmphen and h-Salmphen,were successfully synthe-sized,and both were found to exhibit *** thefindings,h-Salmphen was shown to display typical C─h···πinteractions,characteristic of aggregation-Induced Emission(AIE)active molecules,whereas its halogenated counterpart was identified as behaving similar to aggregation-Caused Quenching(ACQ)active *** types of results suggest that identical intermolecular interactions can produce differing optical *** was shed,at least in part,on the for-mation mechanisms of h-type aggregates and their luminescence properties from these ***,the high optical signal-to-noise ratio inherent to h-aggregates was utilized for the exploration of water content *** an outcome,a high-performancefluorescentfilter paper was developed,enabling easy real-time detection using a smartphone.

关键词： aggregation-caused quenching aggregation-induced emission enhanced C─h···πinteractions fluores-cence sensor h-aggregation

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Regioisomerism effect(RIE) on optimizing ultralong organic phosphorescence lifetimes

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Chinese Chemical Letters 2019年第11期30卷 1974-1978页

作者： Yanni Zhang Jianfeng Zhao Caixia Zhu Lifang Bian huifang Shi Shiming Zhang huili Ma Wei huang Key Laboratory of Flexible Electronics (KLOFE) Institute of Advanced Materials (IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM)Nanjing Tech University (NanjingTech)

Organic phosphorescence materials demonstrate potential optoelectronic applications due to their remarkably ultralong organic phosphorescence(UOP)lifetime and abundant optical characteristics prior to the fluorescence *** a better insight into the intrinsic relationship among regioisomeric molecules,crystalline interactions,and phosphorescence properties,three crystalline dicarbazol-9-yl pyrazine-based regioisomers with para-,meta-and ortho-convergent substitutions(p-DCzP,m-DCzP,and o-DCzP)were designed and presented gradually increased UOP lifetimes prolonging from 63.14,127.93 to 350.46 ms,respectively,due to the regioisomerism effect(RIE)which would be an effective strategy for better understanding of structure-property of UOP materials.

关键词： Regioisomerism effect(RIE) Ultralong organic phosphorescence(UOP) Crystal engineering h-aggregation

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