JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2017
·Vol. 55
·期 22
·3690-3696
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IF 2.952
Wei Huang,Hongxia Yan,Song Niu,Yuqun Du,Luyao Yuan
Fluorescent polymers without π-aromatic structure have been a hot spot in recent years. Polycarbonate has been applied in industry for many years; however, the fluorescent behavior of the polycarbonate has not been reported yet. Therefore, a kind of hyperbranched polycarbonate (HBPC) has been synthesized under solvent and catalyst-free condition. Unexpectedly, the novel HBPC containing no conventional chromophores exhibits unimagined bright blue fluorescence under the irradiation of 334 nm UV light. The intensity of the HBPC fluorescence is rising in step with its concentration going up, showing an aggregation-induced enhanced emission (AIEE). It is more interestingly that the fluorescence of HBPC could be affected by pH and metal ions. Specifically, the fluorescence of HBPC is extraordinarily sensitive to the Fe 3+ . TEM micrographs show that the HBPC self-assemble to clustering in water. Rudimentary investigation illustrates that the formation of cluster accounts for the unexpected fluorescence in the HBPC. This phenomenon is typical of Clustering-Triggered emission (CTE). This study exhibits a novel route for the design of CTE fluorescent polymers. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55 , 3690–3696
研究领域:
材料科学
·
化学
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高影响因子
Chemical Science
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2021
·Vol. 12
·期 37
·12437-12444
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IF 9.825
Xiaopei Li,Dongdong Wang,Yongjie Zhang,Wenqi Lu,Songqiu Yang,Guangjin Hou,Zhenchao Zhao,Haijuan Qin,Yahui Zhang,Minmin Li,Guangyan Qing
Aggregation-induced enhanced emission (AIEE) molecules have significant applications in optoelectronics, biomedical probes and chemical sensors, and large amounts of AIEE molecules have been reported since the concept of AIEE was proposed. Most aromatic AIEE molecules have complex structures consisting of multiple aromatic rings and/or polycyclic skeletons. In this study, we find that 2-aminophenylboronic acid (2-APBA) with a simple structure is highly emissive in the solid state. Further studies reveal that 2-APBA exists in a dimeric form, and the 2-APBA dimer is a novel AIEE molecule. The underlying AIEE mechanism is that the 2-APBA dimeric units aggregate through intermolecular interactions to produce highly ordered molecular packing without the presence of π–π stacking interactions that would lead to aggregation-caused quenching. Furthermore, the 2-APBA dimer aggregates could reversibly transform into its non-fluorescent monomer form driven by new kinds of dynamic covalent B–N and B–O bonds, illustrating its good potential in molecular recognition, nanogating, chemo/bio-sensing and controlled drug release.
研究领域:
有机化学
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材料科学
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生物医学工程
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
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2017
·
IF 5.951
Yuqun Du,Hongxia Yan,Wei Huang,Fu Chai,Song Niu
Nonconventional fluorescent polymers without π-aromatic structure have attracted extensive interest in recent years. Hyperbranched polyesters are generally known because of their industrial applications; however, the luminescent properties of the polyester has not been reported. Herein, we synthesized a series of fully biobased aliphatic hyperbranched polyesters via a one-pot A2 + B3 esterification reaction. Intriguingly, the resultant hyperbranched polyesters carrying no conventional fluorescent units exhibited unexpected bright blue fluorescence under 365 nm UV light. It was found that the fluorescence intensity was enhanced with increasing solution concentrations and molecular weights of the polyesters. Moreover, the results suggested that the luminescence of polyesters could be controlled by solvents and metal ions. In particular, the fluorescence of the polyesters was extremely sensitive to Fe3+. More interesting is that the fluorescence of the polyesters showed an aggregation-induced enhanced emission in the mixture system. Notably, the resulting polyesters displayed a remarkably enhanced quantum yield (16.75%) as compared with that of other types of these polymers. Preliminary results demonstrate that clustering of the carbonyl groups is responsible for the unusual fluorescence in the aliphatic hyperbranched polyesters, namely, clustering-induced emission (CIE). This study provides a novel perspective for the design of biobased luminescent materials to new application areas.
研究领域:
材料科学
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有机化学
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生物材料
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DOI
高影响因子
JOURNAL OF FLUORESCENCE
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2024
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IF 2.6
Li Maomao,Zhu Wenjie,Song Dongdong,Liang Zuoqin,Ye Changqing
Latent fingerprints (LFPs) is one of the most important physical evidence in the criminal scene, playing an important role in forensic investigations. Therefore, developing highly sensitive and convenient materials for the visualization of LFPs is of great significance. We designed and synthesized an organic fluorescent molecule TP-PH with aggregation-induced enhanced emission (AIEE) activity. By simply soaking, blue fluorescent images with high contrast and resolution are readily developed on various surfaces including tinfoil, steel, glass and plastic. Remarkably, LFPs can be visualized within 5 min including the first-, second- and tertiary-level details. In addition, TP-PH exhibits interesting photoactivated fluorescence enhancement properties. Under irradiation of 365 nm UV light with a power density of 382 mW/cm 2 , the fluorescence quantum yield displays approximately 21.5-fold enhancement. Mechanism studies reveals that the photoactivated fluorescence is attributed to the irreversible cyclodehydrogenation reactions under UV irradiation. This work provides a guideline for the design of multifunctional AIEE fluorescent materials.
研究领域:
材料科学
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法医学
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有机化学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2025
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IF 8.2
Faisal Ahmad,Yelan Xiao,Tong Shu,Guangyao Zhang,Xueji Zhang
Electrochemiluminescence (ECL) is rapidly emerging as an excellent electrochemical analytical technique for the specific and sensitive detection of various biomarkers and hazardous trace metals. Among ECL emitters, gold nanoclusters (AuNCs) have proven to be excellent luminophores due to their remarkable luminescent properties, stability, and biocompatibility. However, the low ECL efficiency of AuNCs precludes their application in ultrasensitive biosensing. One of the key reasons for the low ECL efficiency of AuNCs is the nonradiative energy transitions arising from intramolecular vibrations and rotations of the ligands on the surface of AuNCs. Herein, we explore the ECL of Zn2+/Au22(SG)18/PDA nanoclusters (NCs), where Zn2+ and 2,6-pyridinedicarboxaldehyde (PDA) activate the restriction of intramolecular motion (RIM) through aggregation-induced emission (AIE) to aggregation-induced enhanced emission (AIEE). This effect is achieved via cross-linking of Zn2+ and PDA with glutathione on the surface of Au22(SG)18, resulting in a significant enhancement of ECL emission compared to Au22(SG)18 NCs alone. A sensitive ECL sensing system was devised with Zn2+/Au22(SG)18/PDA as the ECL emitter, with triethylamine (TEA) as the coreactant, for the detection of Cu2+ and histidine in the linear ranges of 0.1 to 40 μM and 1 to 85 μM, respectively, with detection limits of 0.705 and 1.928 μM, respectively.
研究领域:
分析化学
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纳米技术
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电化学
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生物传感
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环境监测
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材料科学
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DOI
PubMed
高影响因子
SYNTHETIC METALS
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2019
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IF 2.87
Chenglian Hu,Chunchun Fei,Hongji Jiang
Two blue light emitters M-2EtCz and P-2EtCz based on carbazole and triphenylphosphine oxide were synthesized and characterized. The 5% weight loss temperatures of emitters M-2EtCz and P-2EtCz solid powder were 437 and 495 °C, and their photoluminescent quantum yield in solution were 53.93 and 75.78%, which were both significantly improved to those of parent EtCz-Ph . The introduction of triphenylphosphine oxide into EtCz-Ph can lower the lowest unoccupied molecular orbital levels of emitters M-2EtCz and P-2EtCz , while keeping their highest occupied molecular orbital levels unchanged. All the emitters exhibited blue light emission with aggregation-induced enhanced emission characteristic. The non-doped deep blue light-emitting diodes with maximum external quantum efficiencies of 2.68% were obtained for M-2EtCz , and the electroluminescent color purity of P-2EtCz was better than that of M-2EtCz . The doped device hosted by P-2EtCz achieved a maximum brightness of 10,891 cd/m 2 , external quantum efficiency of 2.04% and current efficiency of 5.65 cd/A.
研究领域:
有机电子学
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材料科学
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光电技术
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Yuqiu Zi,Dawei Xu,Cong Li,Fei Qu,Xian-En Zhao
Herein, a new strategy is developed to induce the aggregation of glutathione-capped gold nanoclusters (GSH-AuNCs) by self-assembly of peptide. The diphenylalanine peptide (L-Phe- l -Phe, FF) self-assembles in aqueous solution into the nano-net structure (FF-Nanonet, FF N). With self-assembly of FF, GSH-AuNCs aggregate in the network of FF N to form a dual-emission probe, called [email protected] One emission is from the self-assembled FF N at 470 nm, and the other one is the aggregation-induced enhanced emission (AIEE) of the GSH-AuNCs at 575 nm. Due to the hydrolysis of FF by chymotrypsin (CHT), the peptide bond on the carboxyl side of the phenylalanine is cleaved and the AIEE from GSH-AuNCs becomes faint because the released nanoclusters are dispersed in the solution again. Therefore, [email protected] can be applied to screen and evaluate the CHT inhibitors. The inhibitory effects of four ingredients from natural products (i.e. epigallocatechin gallate (EGCG), tannic acid, oleanolic acid, and ursolic acid) on CHT activity have been studied. Oleanolic acid and ursolic acid are invalid. The half maximal inhibitory concentration (IC 50) values of EGCG and tannic acid are 13.9 and 19.2 μM, respectively. The screening results show that these two compounds have significant inhibitory effects on CHT.
研究领域:
纳米技术
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生物化学
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材料科学
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酶抑制
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产品关联
DOI
高影响因子
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