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Journal articles on the topic 'Aggregation Induced Emission Active Molecule'

Author: Grafiati

Published: 7 September 2023

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1

Chen, Ying, Ke Ma, Ting Hu, Bo Jiang, Bin Xu, Wenjing Tian, Jing Zhi Sun, and Wenke Zhang. "Investigation of the binding modes between AIE-active molecules and dsDNA by single molecule force spectroscopy." Nanoscale 7, no. 19 (2015): 8939–45. http://dx.doi.org/10.1039/c5nr01247c.

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2

Gao, Ying, Chengyuan Qin, Yong Nie, Wei Liu, Tianrui Li, and Xuchuan Jiang. "Recent Progress in Aggregation-Induced Emission-Active Organic Small Molecule Inorganic Nanocomposites." Chinese Journal of Organic Chemistry 40, no. 8 (2020): 2254. http://dx.doi.org/10.6023/cjoc202003036.

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3

Chaudhary, Jagrity, Vibhor Mittal, Shivangi Mishra, Ankita Daiya, Rajdeep Chowdhury, Inamur Rahaman Laskar, and Ram Kinkar Roy. "A New Aggregation Induced Emission Active Halochromic White Light Emissive Molecule: Combined Experimental and Theoretical Study." Journal of Physical Chemistry C 124, no. 28 (May 27, 2020): 15406–17. http://dx.doi.org/10.1021/acs.jpcc.0c01067.

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4

Raichure, Pramod C., Vishal Kachwal, and Inamur Rahaman Laskar. "‘Aggregation-Induced Emission’ Active Mono-Cyclometalated Iridium(III) Complex Mediated Efficient Vapor-Phase Detection of Dichloromethane." Molecules 27, no. 1 (December 29, 2021): 202. http://dx.doi.org/10.3390/molecules27010202.

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Selective vapor-phase detection of dichloromethane (DCM) is a challenge, it being a well-known hazardous volatile organic solvent in trace amounts. With this in mind, we have developed an ‘Aggregation-induced Emission’ (AIE) active mono-cyclometalated iridium(III)-based (M1) probe molecule, which detects DCM sensitively and selectively in vapor phase with a response time <30 s. It reveals a turn-on emission (non-emissive to intense yellow) on exposing DCM vapor directly to the solid M1. The recorded detection limit is 4.9 ppm for DCM vapor with pristine M1. The mechanism of DCM detection was explored. Moreover, the detection of DCM vapor by M1 was extended with a low-cost filter paper as the substrate. The DCM is weakly bound with the probe and can be removed with a mild treatment, so, notably, the probe can be reused.

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5

DONG, YONG QIANG, CHENYU LI, WEIJUN ZHAO, YUPING DONG, and BEN ZHONG TANG. "STIMULUS RESPONSIVE LUMINESCENT MATERIALS: CRYSTALLIZATION-INDUCED EMISSION ENHANCEMENT." Journal of Molecular and Engineering Materials 01, no. 03 (September 2013): 1340010. http://dx.doi.org/10.1142/s2251237313400108.

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Crystallization of a luminogen normally red-shifts and weakens its emission. During investigation of some luminogens exhibiting aggregation-induced emission (AIE), we first noticed that some AIE active luminogens display higher photoluminescence (PL) intensity and bluer emission in the crystalline state than in their amorphous phase, which is termed as crystallization induced emission enhancement (CIEE). The twisted conformations of CIEE active molecules afford loose packing patterns and rule out any detrimental strong interaction. Molecular conformations are locked more tightly in crystals than those in amorphous solid due to the regular weak interactions in crystals, which affords the CIEE effect. The loose packing patterns facilitate emission switching through morphology modulation. Many AIE active molecules have been developed based on restriction of intramolecular rotation (RIR) mechanism, and we obtained many CIEE compounds from those AIE active luminogens and investigated their utilities as stimuli responsive functional materials, especially as chemosensors, thermosensor, mechanosensors and solid-state emitters. Thus, we provide a possible design strategy for the stimuli responsive solid luminescent materials.

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6

Tang, Baolei, Huapeng Liu, Feng Li, Yue Wang, and Hongyu Zhang. "Single-benzene solid emitters with lasing properties based on aggregation-induced emissions." Chemical Communications 52, no. 39 (2016): 6577–80. http://dx.doi.org/10.1039/c6cc02616h.

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Highly efficient single-benzene solid emitters exhibiting aggregation-induced emission (AIE), crystallization-enhanced emission (CEE), as well as amplified spontaneous emission (ASE) have been obtained based on structurally simple ESIPT-active organic molecules.

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7

Tian, Guangjun, Dexian Sun, Yaogang Zhang, and Xi Yu. "Franck–Condon Blockade and Aggregation‐Modulated Conductance in Molecular Devices Using Aggregation‐Induced Emission‐Active Molecules." Angewandte Chemie International Edition 58, no. 18 (April 23, 2019): 5951–55. http://dx.doi.org/10.1002/anie.201900731.

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8

Tian, Guangjun, Dexian Sun, Yaogang Zhang, and Xi Yu. "Franck–Condon Blockade and Aggregation‐Modulated Conductance in Molecular Devices Using Aggregation‐Induced Emission‐Active Molecules." Angewandte Chemie 131, no. 18 (April 23, 2019): 6012–16. http://dx.doi.org/10.1002/ange.201900731.

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9

Ohtani, Shunsuke, Masayuki Gon, Kazuo Tanaka, and Yoshiki Chujo. "The Design Strategy for an Aggregation- and Crystallization-Induced Emission-Active Molecule Based on the Introduction of Skeletal Distortion by Boron Complexation with a Tridentate Ligand." Crystals 10, no. 7 (July 15, 2020): 615. http://dx.doi.org/10.3390/cryst10070615.

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We describe here a new design strategy for obtaining boron complexes with aggregation- and crystallization-induced emission (AIE and CIE, respectively) properties based on the introduction of skeletal distortion. According to our recent results, despite the fact that an almost planar structure and robust conjugation were obtained, the boron azomethine complex provided a slight emission in solution and an enhanced emission in aggregation and crystal. Quantum calculation results propose that unexpected emission annihilation in solution could be caused through intramolecular bending in the excited state. Herein, to realize this unique molecular motion and obtain AIE and CIE molecules, the phenyl quinoline-based boron complexes BPhQ and BPhQm with distorted and planar structures were designed and synthesized, respectively. BPhQm showed emission in solution and aggregation-caused quenching (ACQ, BPhQm: ΦF,sol. = 0.21, ΦF,agg. = 0.072, ΦF,cryst. = 0.051), while BPhQ exhibited a typical AIE and CIE (BPhQ: ΦF,sol. = 0.008, ΦF,agg. = 0.014, ΦF,cryst. = 0.017). The optical data suggest that a large degree of molecular motion should occur in BPhQ after photo-excitation because of the intrinsic skeletal distortion. Furthermore, single-crystal X-ray diffraction data indicate that the distorted π-conjugated system plays a positive role in presenting solid-state emission by inhibiting consecutive π–π interactions. We demonstrate in this paper that the introduction of the distorted structure by boron complexation should be a new strategy for realizing AIE and CIE properties.

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10

Yu, Hao, Binjie Chen, Huiming Huang, Zhentao He, Jiangman Sun, Guan Wang, Xinggui Gu, and Ben Zhong Tang. "AIE-Active Photosensitizers: Manipulation of Reactive Oxygen Species Generation and Applications in Photodynamic Therapy." Biosensors 12, no. 5 (May 18, 2022): 348. http://dx.doi.org/10.3390/bios12050348.

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Photodynamic therapy (PDT) is a non-invasive approach for tumor elimination that is attracting more and more attention due to the advantages of minimal side effects and high precision. In typical PDT, reactive oxygen species (ROS) generated from photosensitizers play the pivotal role, determining the efficiency of PDT. However, applications of traditional PDT were usually limited by the aggregation-caused quenching (ACQ) effect of the photosensitizers employed. Fortunately, photosensitizers with aggregation-induced emission (AIE-active photosensitizers) have been developed with biocompatibility, effective ROS generation, and superior absorption, bringing about great interest for applications in oncotherapy. In this review, we review the development of AIE-active photosensitizers and describe molecule and aggregation strategies for manipulating photosensitization. For the molecule strategy, we describe the approaches utilized for tuning ROS generation by attaching heavy atoms, constructing a donor-acceptor effect, introducing ionization, and modifying with activatable moieties. The aggregation strategy to boost ROS generation is reviewed for the first time, including consideration of the aggregation of photosensitizers, polymerization, and aggregation microenvironment manipulation. Moreover, based on AIE-active photosensitizers, the cutting-edge applications of PDT with NIR irradiated therapy, activatable therapy, hypoxic therapy, and synergistic treatment are also outlined.

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11

Yan, Xiaojing, Pengcheng Zhu, Zhiguo Zhou, Hong Yang, Haichuang Lan, and Shuzhang Xiao. "Aggregation-induced emission enhancement (AIEE)-active boron-difluoride dyes with reversible mechanochromic fluorescence." RSC Advances 9, no. 61 (2019): 35872–77. http://dx.doi.org/10.1039/c9ra07437f.

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A class of AIEE-active mechanochromic boron-difluorides were reported, and the mechanochromism was ascribed to the transition between H(J)-aggregation with loose molecular packing and J-aggregation with intense intermolecular interactions.

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12

Behera, Santosh Kumar, Anwesha Murkherjee, G. Sadhuragiri, Palani Elumalai, M. Sathiyendiran, Manishekhar Kumar, Biman B. Mandal, and G. Krishnamoorthy. "Aggregation induced enhanced and exclusively highly Stokes shifted emission from an excited state intramolecular proton transfer exhibiting molecule." Faraday Discussions 196 (2017): 71–90. http://dx.doi.org/10.1039/c6fd00171h.

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The inner filter effect due to self-quenching dominates the normal emission of dyes at higher concentrations, which would limit their applications. Since normal emission was also observed with aggregation induced emission enhancement (AIEE) active excited state intramolecular proton transfer (ESIPT) exhibiting molecules, two new molecules are synthesized and studied to obtain normal emission free AIEE. The molecules are 4-(3-(benzo[d]thiazol-2-yl)-5-tert-butyl-4-hydroxybenzyl)-2-(benzo[d]thiazol-2-yl)-6-tert-butyl phenol (bis-HPBT) and its oxazole analogue (bis-HPBO). Of these molecules, bis-HPBT, which is weakly fluorescent in tetrahydrofuran solution, shows a sudden high enhancement in fluorescence upon addition of 70% water due to the formation of aggregates. Though the normal emission is also observed in tetrahydrofuran, it is completely eliminated in the aggregates, and the aggregates display exclusive tautomer emission. However, bis-HPBO does not emit such an exclusive tautomer emission in the water/tetrahydrofuran mixture. The enhancement in the fluorescence quantum yield of bis-HPBT in 70% water is ∼300 times higher than that in tetrahydrofuran. The modulated molecular structure of bis-HPBT is the cause of this outstanding AIEE. The observation of almost exclusive tautomer emission is a new additional advantage of AIEE from bis-HPBT over other ESIPT molecules. Since the tautomer emission is highly Stokes shifted, no overlap with the absorption spectrum occurs and therefore, the inner filter effect is averted. The aggregated structure acts as a good fluorescence chemosensor for metal ions as well as anions. The aggregated structure is cell permeable and can be used for cell imaging.

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13

Wang, Lingyun, Meiying Huang, Hao Tang, Derong Cao, and Yu Zhao. "Fabrication and Application of Dual-Modality Polymer Nanoparticles Based on an Aggregation-Induced Emission-Active Fluorescent Molecule and Magnetic Fe3O4." Polymers 11, no. 2 (January 28, 2019): 220. http://dx.doi.org/10.3390/polym11020220.

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Fluorescent magnetic nanoparticles (NPs) utilized for imaging hold great promise for biomedical applications, but it remains a challenging task. Here, we report novel dual-modality NPs using an aggregation-induced emission (AIE)-active and near-infrared (NIR) emissive dye (TPAS) and magnetic Fe3O4 as the core, and biocompatible polymer Pluronic F-127 as the encapsulation matrix by self-assembly procedures. The obtained fluorescent-magnetic AIE NPs have both high fluorescence quantum yield (13.8%) at 700 nm and high magnetic saturation value. With good photostability and biocompatibility, the resulting NPs show effective MRI ability, but also a stain in cytoplasm with a strong NIR fluorescent signal.

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14

Hu, Rong, Guiquan Zhang, Anjun Qin, and Ben Zhong Tang. "Aggregation-induced emission (AIE): emerging technology based on aggregate science." Pure and Applied Chemistry 93, no. 12 (October 20, 2021): 1383–402. http://dx.doi.org/10.1515/pac-2021-0503.

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Abstract Functional materials serve as the basic elements for the evolution of technology. Aggregation-induced emission (AIE), as one of the top 10 emerging technologies in chemistry, is a scientific concept coined by Tang, et al. in 2001 and refers to a photophysical phenomenon with enhanced emission at the aggregate level compared to molecular states. AIE-active materials generally present new properties and performance that are absent in the molecular state, providing endless possibilities for the development of technological applications. Tremendous achievements based on AIE research have been made in theoretical exploration, material development and practical applications. In this review, AIE-active materials with triggered luminescence of circularly polarized luminescence, aggregation-induced delayed fluorescence, room-temperature phosphorescence, and clusterization-triggered emission at the aggregate level are introduced. Moreover, high-tech applications in optoelectronic devices, responsive systems, sensing and monitoring, and imaging and therapy are briefly summarized and discussed. It is expected that this review will serve as a source of inspiration for innovation in AIE research and aggregate science.

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15

Arumugaperumal, Reguram, Muthaiah Shellaiah, Yu-Kuang Lai, Parthiban Venkatesan, Putikam Raghunath, Shu-Pao Wu, Ming-Chang Lin, Kien Wen Sun, Wen-Sheng Chung, and Hong-Cheu Lin. "Acid–base controllable nanostructures and the fluorescence detection of H2PO4− by the molecular shuttling of tetraphenylethene-based [2]rotaxanes." Journal of Materials Chemistry C 9, no. 9 (2021): 3215–28. http://dx.doi.org/10.1039/d0tc05358a.

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Aggregation-induced emission (AIE)-active switchable [2]rotaxanes with two arm-terminated TPE units synthesized by click reaction can induce various acid-base controllable nanostructures and exhibit selective detection of H₂PO₄⁻ ion.

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16

Liu, Shanting, Yue Yang, Dian-dian Deng, Xiao-wen Deng, Zhao Chen, Xiao-Yan Wang, and Shouzhi Pu. "Highly emissive D-A-π-D type aggregation-induced emission (AIE) or aggregation-induced emission enhancement (AIEE)-active benzothiadiazole derivatives with contrasting mechanofluorochromic features." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 274 (June 2022): 121122. http://dx.doi.org/10.1016/j.saa.2022.121122.

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17

Majeed, Shumaila, Muhammad Tahir Waseem, Hafiz Muhammad Junaid, Gul Shahzada Khan, Shamyla Nawazish, Tariq Mahmood, Asad Muhammad Khan, and Sohail Anjum Shahzad. "Aggregation induced emission based fluorenes as dual-channel fluorescent probes for rapid detection of cyanide: applications of smartphones and logic gates." RSC Advances 12, no. 29 (2022): 18897–910. http://dx.doi.org/10.1039/d2ra03119a.

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18

Pasha, Sheik Saleem, Hare Ram Yadav, Angshuman Roy Choudhury, and Inamur Rahaman Laskar. "Synthesis of an aggregation-induced emission (AIE) active salicylaldehyde based Schiff base: study of mechanoluminescence and sensitive Zn(ii) sensing." Journal of Materials Chemistry C 5, no. 37 (2017): 9651–58. http://dx.doi.org/10.1039/c7tc03046k.

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19

Chen, Wen-Bin, Yan-Cong Chen, Jun-Liang Liu, Jian-Hua Jia, Long-Fei Wang, Quan-Wen Li, and Ming-Liang Tong. "A Piezochromic Dysprosium(III) Single-Molecule Magnet Based on an Aggregation-Induced-Emission-Active Tetraphenylethene Derivative Ligand." Inorganic Chemistry 56, no. 15 (July 10, 2017): 8730–34. http://dx.doi.org/10.1021/acs.inorgchem.7b01059.

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20

Yan, Qing, and Sheng Wang. "Fusion of aggregation-induced emission and photochromics for promising photoresponsive smart materials." Materials Chemistry Frontiers 4, no. 11 (2020): 3153–75. http://dx.doi.org/10.1039/d0qm00522c.

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21

Wu, Zhiyuan, Jinghuai Dou, Kathy-Uyen Nguyen, Jayden C. Eppley, Kittipan Siwawannapong, Yunlong Zhang, and Jonathan S. Lindsey. "Tailoring the AIE Chromogen 2-(2-Hydroxyphenyl)benzothiazole for Use in Enzyme-Triggered Molecular Brachytherapy." Molecules 27, no. 24 (December 8, 2022): 8682. http://dx.doi.org/10.3390/molecules27248682.

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A targeted strategy for treating cancer is antibody-directed enzyme prodrug therapy, where the enzyme attached to the antibody causes conversion of an inactive small-molecule prodrug into an active drug. A limitation may be the diffusion of the active drug away from the antibody target site. A related strategy with radiotherapeutics entails enzymatically promoted conversion of a soluble to insoluble radiotherapeutic agent, thereby immobilizing the latter at the target site. Such a molecular brachytherapy has been scarcely investigated. In distinct research, the advent of molecular designs for aggregation-induced emission (AIE) suggests translational use in molecular brachytherapy. Here, several 2-(2-hydroxyphenyl)benzothiazole substrates that readily aggregate in aqueous solution (and afford AIE) were elaborated in this regard. In particular, (1) the 2-(2-hydroxyphenyl) unit was derivatized to bear a pegylated phosphodiester that imparts water solubility yet undergoes enzymatic cleavage, and (2) a p-phenol unit was attached to the benzo moiety to provide a reactive site for final-step iodination (here examined with natural abundance iodide). The pegylated phosphodiester-iodinated benzothiazole undergoes conversion from aqueous-soluble to aqueous-insoluble upon treatment with a phosphatase or phosphodiesterase. The aggregation is essential to molecular brachytherapy, whereas the induced emission of AIE is not essential but provides a convenient basis for research development. Altogether, 21 compounds were synthesized (18 new, 3 known via new routes). Taken together, blending biomedical strategies of enzyme prodrug therapy with materials chemistry concerning substances that undergo AIE may comprise a step forward on the long road toward molecular brachytherapy.

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22

Kumbhar, Haribhau S., Saurabh S. Deshpande, and Ganapati S. Shankarling. "Aggregation induced emission (AIE) active carbazole styryl fluorescent molecular rotor as viscosity sensor." ChemistrySelect 1, no. 9 (June 16, 2016): 2058–64. http://dx.doi.org/10.1002/slct.201600001.

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23

Tian, Xike, Linfeng Chen, Yong Li, Chao Yang, Yulun Nie, Chaoxin Zhou, and Yanxin Wang. "Design and synthesis of a molecule with aggregation-induced emission effects and its application in the detection of arsenite in groundwater." Journal of Materials Chemistry C 5, no. 15 (2017): 3669–72. http://dx.doi.org/10.1039/c7tc00363c.

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24

Yin, Yin, Li Chao Dong, Na Jin, Yan Guan, Jun Ge Zhi, and Wen Sheng Deng. "Synthesis and Aggregation-Induced Emission Feature of Series of Polysiloxanes Containing Triphenylpyrrole Side-Chain." Key Engineering Materials 842 (May 2020): 47–52. http://dx.doi.org/10.4028/www.scientific.net/kem.842.47.

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A series of aggregation-induced emission (AIE) active polysiloxanes (P7-1~P7-2, P29-1~P29-6) were prepared through hydrosilylation between polymethylhydrosiloxane (PMHS, DP=7 or 29) and AIE-active vinyl monomer 1-(4'-allyloxy-biphenyl)-2,5-diphenyl pyrrole (M-TPP), or with optical active monomer cholesteryl allyloxy ether (M-Chol*). Monomer M-TPP and all of the polymers exhibits aggeragation-induced emission enhancement properties. The fluorescence intensity of M-TPP in THF/H2O mixtures increases when the water fraction is higher than 60%, while is over 20% for polysiloxanes, which mainly because the entanglement of the flexible polysiloxane main-chain can restrict the molecular motion of triphenylpyrrole (TPP) derivates and induce the increasing of the fluorescence intensity. Moreover, the maximum relative fluorescence intensity (I/I0) is equal to 4 for M-TPP and 1.4~4.9 for polysiloxanes, and the grafted degree of the TPP derivative has effect on the AIE properties of polymers. The specific optical rotations of the chiral polymers increase with increasing the content of chiral cholesteryl ether moieties. All the target polymers possess good thermal stabilities and their decomposition points (Td) are greater than 320°C.

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25

Kuang, Yunsuo, Linfeng Chen, Xike Tian, Yong Li, Liqiang Lu, Chao Yang, Zhaoxin Zhou, and Yulun Nie. "Novel AIEgens with a 3,5-dibromobenzaldehyde skeleton: molecular design, synthesis, tunable emission and detection application." Analytical Methods 10, no. 46 (2018): 5486–92. http://dx.doi.org/10.1039/c8ay02070a.

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In this study, three novel fluorophores with aggregation-induced emission effects (AIE) have been synthesized by a new strategy that uses the non-AIE active compound 3,5-dibromobenzaldehyde (DBB) as a core (stator).

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26

Mandal, Kuheli, and Nikhil R. Jana. "Galactose-Functionalized, Colloidal-Fluorescent Nanoparticle from Aggregation-Induced Emission Active Molecule via Polydopamine Coating for Cancer Cell Targeting." ACS Applied Nano Materials 1, no. 7 (June 8, 2018): 3531–40. http://dx.doi.org/10.1021/acsanm.8b00673.

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27

Zhou, Shasha, Sidan Guo, Weidong Liu, Qiaoying Yang, Huili Sun, Riqing Ding, Zhaosheng Qian, and Hui Feng. "Rational design of reversibly photochromic molecules with aggregation-induced emission by introducing photoactive thienyl and benzothienyl groups." Journal of Materials Chemistry C 8, no. 38 (2020): 13197–204. http://dx.doi.org/10.1039/d0tc02297g.

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A general strategy to design reversible photochromic molecules with solid-state fluorescence by introducing photoactive thienyl and benzothienyl groups into an AIE-active molecular skeleton was proposed.

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28

Meng, Fei, Chengkai Zhang, Dandan Li, and Yupeng Tian. "Aggregation induced emission-active two-photon absorption zwitterionic chromophore for bioimaging application." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 226 (February 2020): 117571. http://dx.doi.org/10.1016/j.saa.2019.117571.

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29

Wang, Yilan, Hongliang Liu, Zhao Chen, and Shouzhi Pu. "Aggregation-induced emission enhancement (AIEE)-active tetraphenylethene (TPE)-based chemosensor for CN−." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 245 (January 2021): 118928. http://dx.doi.org/10.1016/j.saa.2020.118928.

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30

Zalmi, Geeta A., Ratan W. Jadhav, Harshad A. Mirgane, and Sheshanath V. Bhosale. "Recent Advances in Aggregation-Induced Emission Active Materials for Sensing of Biologically Important Molecules and Drug Delivery System." Molecules 27, no. 1 (December 27, 2021): 150. http://dx.doi.org/10.3390/molecules27010150.

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The emergence and development of aggregation induced emission (AIE) have attracted worldwide attention due to its unique photophysical phenomenon and for removing the obstacle of aggregation-caused quenching (ACQ) which is the most detrimental process thereby making AIE an important and promising aspect in various fields of fluorescent material, sensing, bioimaging, optoelectronics, drug delivery system, and theranostics. In this review, we have discussed insights and explored recent advances that are being made in AIE active materials and their application in sensing, biological cell imaging, and drug delivery systems, and, furthermore, we explored AIE active fluorescent material as a building block in supramolecular chemistry. Herein, we focus on various AIE active molecules such as tetraphenylethylene, AIE-active polymer, quantum dots, AIE active metal-organic framework and triphenylamine, not only in terms of their synthetic routes but also we outline their applications. Finally, we summarize our view of the construction and application of AIE-active molecules, which thus inspiring young researchers to explore new ideas, innovations, and develop the field of supramolecular chemistry in years to come.

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31

Elsyed, Amal Farghal Noreldein, Gah-Lai Wong, Mohamed Ameen, Min-Wei Wu, and Cheng-Chung Chang. "Tunable Fluorescence via Self-Assembled Switching of AIE-Active Micelle-like Nanoaggregates." International Journal of Molecular Sciences 24, no. 12 (June 9, 2023): 9941. http://dx.doi.org/10.3390/ijms24129941.

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Chemical structures bearing a combination of aggregation-induced emission enhancement (AIEE) and intramolecular charge transfer (ICT) properties attracted the attention of many researchers. Recently, there is an increasing demand to pose tunable AIEE and ICT fluorophores that could present their conformation changes-related emission colors by adjusting the medium polarity. In this study, we designed and synthesized a series of 4-alkoxyphenyl-substituted 1,8-naphthalic anhydride derivatives NAxC using the Suzuki coupling reaction to construct donor–acceptor (D-A)-type fluorophores with alkoxyl substituents of varying carbon chain lengths (x = 1, 2, 4, 6, 12 in NAxC). To explain the observation that molecules with longer carbon chains revealed unusual fluorescence enhancement in water, we study the optical properties and evaluate their locally excited (LE) and ICT states by solvent effects combined with Lippert–Mataga plots. Then, we explored the self-assembly abilities of these molecules in water-organic (W/O) mixed solutions and observed the morphology of its nanostructure using a fluorescence microscope and SEM. The results show that NAxC, x = 4, 6, 12 show different degrees of self-assembly behaviors and corresponding aggregation-induced emission enhancement (AIEE) progresses. At the same time, different nanostructures and corresponding spectral changes can be obtained by adjusting the water ratio in the mixed solution. That is, NAxC compounds present different transitions between LE, ICT and AIEE based on the polarity, water ratio and time changes. We designed NAxC as the structure–activity relationship (SAR) of the surfactant to demonstrate that AIEE comes from the formation of micelle-like nanoaggregates, which causes a restriction of the transfer from the LE state to the ICT state, and micelle formation results in a blue-shift in emission and enhances the intensity in the aggregate state. Among them, NA12C is most likely to form micelles and the most obvious fluorescence enhancement, which will switch over time due to the nano-aggregation transition.

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32

Yu, Hai-Xia, Junge Zhi, Zheng-Feng Chang, Tianjiao Shen, Wei-Lu Ding, Xiaoling Zhang, and Jin-Liang Wang. "Rational design of aggregation-induced emission sensor based on Rhodamine B for turn-on sensing of trivalent metal cations, reversible data protection, and bioimaging." Materials Chemistry Frontiers 3, no. 1 (2019): 151–60. http://dx.doi.org/10.1039/c8qm00424b.

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33

Wu, Yi, Ying He, Huiqing Luo, Tingting Jin, and Feng He. "AIEE-Active Flavones as a Promising Tool for the Real-Time Tracking of Uptake and Distribution in Live Zebrafish." International Journal of Molecular Sciences 24, no. 12 (June 15, 2023): 10183. http://dx.doi.org/10.3390/ijms241210183.

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In recent years, aggregation-induced emission enhancement (AIEE) molecules have shown great potential for applications in the fields of bio-detection, imaging, optoelectronic devices, and chemical sensing. Based on our previous studies, we investigated the fluorescence properties of six flavonoids and confirmed that compounds 1–3 have good aggregation-induced emission enhancement (AIEE) properties through a series of spectroscopic experiments. Compounds with AIEE properties have addressed the limitation imposed by the aggregation-caused quenching (ACQ) of classic organic dyes owing to their strong fluorescence emission and high quantum yield. Based on their excellent fluorescence properties, we evaluated their performance in the cell and we found that they could label mitochondria specifically by comparing their Pearson correlation coefficients (R) with Mito Tracker Red and Lyso-Tracker Red. This suggests their future application in mitochondrial imaging. Furthermore, studies of uptake and distribution characterization in 48 hpf zebrafish larvae revealed their potential for monitoring real-time drug behavior. The uptake of compounds by larvae varies significantly across different time cycles (between uptake and utilization in the tissue). This observation has important implications for the development of visualization techniques for pharmacokinetic processes and can enable real-time feedback. More interestingly, according to the data presented, tested compounds aggregated in the liver and intestine of 168 hpf larvae. This finding suggests that they could potentially be used for monitoring and diagnosing liver and intestinal diseases.

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Wang, Yuan, Hao Wu, Wei-Na Wu, Ya-Ping Yu, Xiao-Lei Zhao, Zhi-Hong Xu, Zhou-Qing Xu, and Yun-Chang Fan. "Aggregation-induced ratiometric emission active monocarbazone: Ratiometric fluorescent probe for Cu2+ in either solution or aggregation states." Journal of Luminescence 204 (December 2018): 289–95. http://dx.doi.org/10.1016/j.jlumin.2018.08.042.

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Kato, Takuji, and Kensuke Naka. "Arylaminomaleimides as a New Class of Aggregation-induced Emission-active Molecules Obtained from Organoarsenic Compounds." Chemistry Letters 41, no. 11 (November 5, 2012): 1445–47. http://dx.doi.org/10.1246/cl.2012.1445.

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Ji, Yan-Ming, Min Hou, Wei Zhou, Zhang-Wei Ning, Yuan Zhang, and Guo-Wen Xing. "An AIE-Active NIR Fluorescent Probe with Good Water Solubility for the Detection of Aβ1–42 Aggregates in Alzheimer’s Disease." Molecules 28, no. 13 (June 29, 2023): 5110. http://dx.doi.org/10.3390/molecules28135110.

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Alzheimer’s disease (AD), an amyloid-related disease, seriously endangers the health of elderly individuals. According to current research, its main pathogenic factor is the amyloid protein, which is a kind of fibrillar aggregate formed by noncovalent self-assembly of proteins. Based on the characteristics of aggregation-induced emission (AIE), a bislactosyl-decorated tetraphenylethylene (TPE) molecule TMNL (TPE + malononitrile + lactose), bearing two malononitrile substituents, was designed and synthesized in this work. The amphiphilic TMNL could self-assemble into fluorescent organic nanoparticles (FONs) with near-infrared (NIR) fluorescence emission in physiological PBS (phosphate buffered saline), achieving excellent fluorescent enhancement (47-fold) upon its combination with Aβ1–42 fibrils. TMNL was successfully applied to image Aβ1–42 plaques in the brain tissue of AD transgenic mice, and due to the AIE properties of TMNL, no additional rinsing process was necessary. It is believed that the probe reported in this work should be useful for the sensitive detection and accurate localization mapping of Aβ1–42 aggregates related to Alzheimer’s disease.

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Sarma, Parishmita, Khemnath Patir, Kashyap Kumar Sarmah, Sonit Kumar Gogoi, Ranjit Thakuria, and Pranab Jyoti Das. "Stimuli-responsive aggregation-induced fluorescence in a series of biphenyl-based Knoevenagel products: effects of substituent active methylene groups on π–π interactions." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 75, no. 5 (August 31, 2019): 775–83. http://dx.doi.org/10.1107/s2052520619009156.

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A series of three biphenyl-based Knoevenagel products (denoted 1a, 1b, 1c) with active methylene groups has been synthesized. Compounds 1a and 1b show strong solid-state fluorescence, whereas 1c displays low emission. Effects of substituent groups in condensed phase packing of the molecules have been investigated and correlated with their photophysical properties. Interestingly, compound 1a exhibits mechanofluorochromism with emission color changes from yellow to green (wavelength shift of 40 nm) after mechanical grinding. Furthermore, fluorescence of 1a and 1b is turned off under alkaline conditions, making them potential candidates for aggregation-enhanced emission-based pH sensors.

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Dong, Yanjing, Zikang Chen, Meirong Hou, Li Qi, Chenggong Yan, Xiaodan Lu, Ruiyuan Liu, and Yikai Xu. "Mitochondria-targeted aggregation-induced emission active near infrared fluorescent probe for real-time imaging." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 224 (January 2020): 117456. http://dx.doi.org/10.1016/j.saa.2019.117456.

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Meng, Fei. "Aggregation induced emission-active molecules bearing tunable singlet oxygen generation: The different length alkyl chain matters." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 248 (March 2021): 119233. http://dx.doi.org/10.1016/j.saa.2020.119233.

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Zhang, Xiao-Wen, Xu-Lin Chen, and Can-Zhong Lu. "High-Contrast Visualization Chemiluminescence Based on AIE-Active and Base-Sensitive Emitters." Molecules 28, no. 9 (May 8, 2023): 3976. http://dx.doi.org/10.3390/molecules28093976.

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Peroxyoxalate chemiluminescence (PO-CL) is one of the most popular cold light sources, yet the drawback of aggregation-caused quenching limits their use. Here, we report a new kind of efficient bifunctional emitter derived from salicylic acid, which not only exhibits typical aggregation-induced emission (AIE) character but also has the ability to catalyze the CL process under basic conditions based on base sensitivity. By taking advantage of these unique features, we successfully confine the CL process on the surface of solid bases and provide a high-contrast visualization of CL emission. This method allows most of the common basic salts like sodium carbonate to be invisible encryption information ink and PO-CL solution to be a decryption tool to visualize the hidden information. The current study opens up an appealing way for the development of multifunction CL emitters for information encryption and decryption applications.

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Li, Danxia, Peiying Liu, Yonghong Tan, Zhijun Zhang, Miaomiao Kang, Dong Wang, and Ben Zhong Tang. "Type I Photosensitizers Based on Aggregation-Induced Emission: A Rising Star in Photodynamic Therapy." Biosensors 12, no. 9 (September 4, 2022): 722. http://dx.doi.org/10.3390/bios12090722.

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Photodynamic therapy (PDT), emerging as a minimally invasive therapeutic modality with precise controllability and high spatiotemporal accuracy, has earned significant advancements in the field of cancer and other non-cancerous diseases treatment. Thereinto, type I PDT represents an irreplaceable and meritorious part in contributing to these delightful achievements since its distinctive hypoxia tolerance can perfectly compensate for the high oxygen-dependent type II PDT, particularly in hypoxic tissues. Regarding the diverse type I photosensitizers (PSs) that light up type I PDT, aggregation-induced emission (AIE)-active type I PSs are currently arousing great research interest owing to their distinguished AIE and aggregation-induced generation of reactive oxygen species (AIE-ROS) features. In this review, we offer a comprehensive overview of the cutting-edge advances of novel AIE-active type I PSs by delineating the photophysical and photochemical mechanisms of the type I pathway, summarizing the current molecular design strategies for promoting the type I process, and showcasing current bioapplications, in succession. Notably, the strategies to construct highly efficient type I AIE PSs were elucidated in detail from the two aspects of introducing high electron affinity groups, and enhancing intramolecular charge transfer (ICT) intensity. Lastly, we present a brief conclusion, and a discussion on the current limitations and proposed opportunities.

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Younis, Osama, Esam A. Orabi, Adel M. Kamal, Mostafa Sayed, Reda Hassanien, Rebecca L. Davis, Osamu Tsutsumi, and Mostafa Ahmed. "Aggregation-induced emission with white, green, or blue luminescence from biologically-active indole derivatives." Optical Materials 100 (February 2020): 109713. http://dx.doi.org/10.1016/j.optmat.2020.109713.

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Yu, Yuewen, Hanyu Jia, Yubo Liu, Le Zhang, Guangxue Feng, and Ben Zhong Tang. "Recent Progress in Type I Aggregation-Induced Emission Photosensitizers for Photodynamic Therapy." Molecules 28, no. 1 (December 31, 2022): 332. http://dx.doi.org/10.3390/molecules28010332.

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In modern medicine, precision diagnosis and treatment using optical materials, such as fluorescence/photoacoustic imaging-guided photodynamic therapy (PDT), are becoming increasingly popular. Photosensitizers (PSs) are the most important component of PDT. Different from conventional PSs with planar molecular structures, which are susceptible to quenching effects caused by aggregation, the distinct advantages of AIE fluorogens open up new avenues for the development of image-guided PDT with improved treatment accuracy and efficacy in practical applications. It is critical that as much of the energy absorbed by optical materials is dissipated into the pathways required to maximize biomedical applications as possible. Intersystem crossing (ISC) represents a key step during the energy conversion process that determines many fundamental optical properties, such as increasing the efficiency of reactive oxygen species (ROS) production from PSs, thus enhancing PDT efficacy. Although some review articles have summarized the accomplishments of various optical materials in imaging and therapeutics, few of them have focused on how to improve the phototherapeutic applications, especially PDT, by adjusting the ISC process of organic optics materials. In this review, we emphasize the latest advances in the reasonable design of AIE-active PSs with type I photochemical mechanism for anticancer or antibacterial applications based on ISC modulation, as well as discuss the future prospects and challenges of them. In order to maximize the anticancer or antibacterial effects of type I AIE PSs, it is the aim of this review to offer advice for their design with the best energy conversion.

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Wang, Junjie, Tianzi Xia, Zhenni Lan, Guangyan Liu, Shili Hou, and Shifeng Hou. "Facile synthesis of an aggregation-induced emission (AIE) active imidazoles for sensitive detection of trifluralin." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 259 (October 2021): 119880. http://dx.doi.org/10.1016/j.saa.2021.119880.

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Wang, Rong, Ju Ding, and Yanrong Zhang. "Naphthalimide/benzimide-based excited-state intramolecular proton transfer active luminogens: aggregation-induced enhanced emission and potential for chemical modification." New Journal of Chemistry 43, no. 23 (2019): 9152–61. http://dx.doi.org/10.1039/c9nj01685f.

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Zhang, Chengkai, Yanqian Zhao, Dandan Li, Jiejie Liu, Heguo Han, Daoyu He, Xiaohe Tian, Shengli Li, Jieying Wu, and Yupeng Tian. "Aggregation-induced emission (AIE)-active molecules bearing singlet oxygen generation activities: the tunable singlet–triplet energy gap matters." Chemical Communications 55, no. 10 (2019): 1450–53. http://dx.doi.org/10.1039/c8cc09230c.

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Michida, Wataru, Anna Nagai, Mina Sakuragi, Tadashi Okobira, and Katsuki Kusakabe. "Fluorescence Emission Behaviors of the L-Cysteine/Au(I) Complex in a Cyclodextrin-Based Metal-Organic Framework." Processes 8, no. 12 (November 27, 2020): 1555. http://dx.doi.org/10.3390/pr8121555.

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Aggregation-induced emission (AIE) molecules are nonemissive in dilute solution but emit intensely upon aggregation in complete contrast to aggregation-caused quenching (ACQ) molecules. The emission of ACQ molecules, such as fluorescein, that have been encapsulated into the hydrophilic nanopores in a cyclodextrin-based metal-organic framework (CD-MOF) was reported to be enhanced due to the disappearance of concentration quenching and the restriction of thermal motion. However, the contribution of the restriction of thermal motion in CD-MOF could not be elucidated. In this study, an AIE-active L-cysteine/Au(I) (L-Cys/Au(I)) complex was synthesized and introduced into the nanopores of CD-MOF via a co-crystallization method. We determined the amount and chemical composition of the L-Cys/Au(I) complex in CD-MOF. The fluorescence intensity of the L-Cys/Au(I)@CD-MOF composite was investigated. The L-Cys/Au(I) complex that was synthesized from Au(III) chloride and L-cysteine was found to be a linear oligomer consisting of Cys5Au4. For the L-Cys/Au(I)@CD-MOF composite with a L-Cys/Au(I) complex of 0.45 per hydrophilic nanopore, the total fluorescence intensity of the isolated L-Cys/Au(I) complex in CD-MOF exceeded that of the L-Cys/Au(I) complex in the solid-state due to the restriction of the thermal motion without the aggregation of the complex.

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Wen, Li-Li, Xue-Gang Hou, Guo-Gang Shan, Wei-Lin Song, Shu-Ran Zhang, Hai-Zhu Sun, and Zhong-Min Su. "Rational molecular design of aggregation-induced emission cationic Ir(iii) phosphors achieving supersensitive and selective detection of nitroaromatic explosives." J. Mater. Chem. C 5, no. 41 (2017): 10847–54. http://dx.doi.org/10.1039/c7tc03535g.

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Shellaiah, Muthaiah, and Kien-Wen Sun. "Pyrene-Based AIE Active Materials for Bioimaging and Theranostics Applications." Biosensors 12, no. 7 (July 21, 2022): 550. http://dx.doi.org/10.3390/bios12070550.

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Aggregation-induced emission (AIE) is a unique research topic and property that can lead to a wide range of applications, including cellular imaging, theranostics, analyte quantitation and the specific detection of biologically important species. Towards the development of the AIE-active materials, many aromatic moieties composed of tetraphenylethylene, anthracene, pyrene, etc., have been developed. Among these aromatic moieties, pyrene is an aromatic hydrocarbon with a polycyclic flat structure containing four fused benzene rings to provide an unusual electron delocalization feature that is important in the AIE property. Numerous pyrene-based AIE-active materials have been reported with the AIE property towards sensing, imaging and theranostics applications. Most importantly, these AIE-active pyrene moieties exist as small molecules, Schiff bases, polymers, supramolecules, metal-organic frameworks, etc. This comprehensive review outlines utilizations of AIE-active pyrene-based materials on the imaging and theranostics studies. Moreover, the design and synthesis of these pyrene-based molecules are delivered with discussions on their future scopes.

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Han, Mina, and Khin Moe. "Light-Responsive Hexagonal Assemblies of Triangular Azo Dyes." Molecules 27, no. 14 (July 8, 2022): 4380. http://dx.doi.org/10.3390/molecules27144380.

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The rational design of small building block molecules and understanding their molecular assemblies are of fundamental importance in creating new stimuli-responsive organic architectures with desired shapes and functions. Based on the experimental results of light-induced conformational changes of four types of triangular azo dyes with different terminal functional groups, as well as absorption and fluorescence characteristics associated with their molecular assemblies, we report that aggregation-active emission enhancement (AIEE)-active compound (1) substituted with sterically crowded tert-butyl (t-Bu) groups showed approximately 35% light-induced molecular switching and had a strong tendency to assemble into highly stable hexagonal structures with AIEE characteristics. Their sizes were regulated from nanometer-scale hexagonal rods to micrometer-scale sticks depending on the concentration. This is in contrast to other triangular compounds with bromo (Br) and triphenylamine (TPA) substituents, which exhibited no photoisomerization and tended to form flexible fibrous structures. Moreover, non-contact exposure of the fluorescent hexagonal nanorods to ultraviolet (UV) light led to a dramatic hexagonal-to-amorphous structure transition. The resulting remarkable variations, such as in the contrast of microscopic images and fluorescence characteristics, were confirmed by various microscopic and spectroscopic measurements.

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