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Journal articles on the topic 'Quenching and enhancement of fluorescence'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Das, Ruma, Gone Rajender, and P. K. Giri. "Anomalous fluorescence enhancement and fluorescence quenching of graphene quantum dots by single walled carbon nanotubes." Physical Chemistry Chemical Physics 20, no. 6 (2018): 4527–37. http://dx.doi.org/10.1039/c7cp06994d.

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We explore the mechanism of the fluorescence enhancement and fluorescence quenching effect of single walled carbon nanotubes (SWCNTs) on highly fluorescent graphene quantum dots (GQDs) over a wide range of concentrations of SWCNTs.

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2

Isaac, Justin R., and Huizhong Xu. "Fluorescence enhancement and quenching in tip-enhanced fluorescence spectroscopy." OSA Continuum 1, no. 3 (October 23, 2018): 899. http://dx.doi.org/10.1364/osac.1.000899.

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3

Mei, Qunbo, Ruqiang Tian, Yujie Shi, Qingfang Hua, Chen Chen, and Bihai Tong. "A series of selective and sensitive fluorescent sensors based on a thiophen-2-yl-benzothiazole unit for Hg2+." New Journal of Chemistry 40, no. 3 (2016): 2333–42. http://dx.doi.org/10.1039/c5nj02259b.

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Different types of fluorescent probes for Hg²⁺ based on the 5-thiophen-2-yl-benzothiazole derivatives (TBT, CTBT, DTBT and NTBT) were realized by changing the subsituents, including the fluorescence quenching probe, the fluorescence enhancement probe and the ratiometric fluorescent probe.

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4

Yang, Ailing, Ning Wang, Yujin Wang, Shunpin Li, Lele Wang, Yun Yang, Xichang Bao, and Renqiang Yang. "Improving the Fluorescence Concentration Quenching of Porphyrin Potassium Salt by Ag Nano Colloids." Journal of Nanoscience and Nanotechnology 16, no. 4 (April 1, 2016): 3646–52. http://dx.doi.org/10.1166/jnn.2016.11881.

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Silver nanoparticles (NPs) with diameters less than 25 nm, and 5, 10, 15, 20-tetrakis(4-carboxy-phenyl) porphyrin potassium salt (K4TCPPS) was synthesized. By adding silver colloids into the K4TCPPS solutions, the fluorescence concentration quenching of the K4TCPPS solutions was improved between 1×10−6–5×10−4 M, depending on the size of the Ag NPs, the concentration of the K4TCPPS and the excitation wavelength. Under excitation wavelengths of 360 and 414 nm, the enhancement was in the range of 0.34–22.8, and 0.71–82.46, respectively. The enhancement increased with decreasing size of the Ag NPs. At the two highest enhancements, the concentrations of the K4TCPPS solutions were 1×10−4 and 1×10−5 M respectively, and the size of the Ag NPs was about 5 nm. The main reasons for the fluorescence enhancing effect are due to fluorescence resonance energy transfer (FRET) between K4TCPPS molecules and Ag NPs, and decreased collision quenching between free K4TCPPS molecules, and free K4TCPPS molecules with Ag NPs. Our results showed that Ag NPs with sizes of about 5 nm can effectively improve the fluorescence concentration quenching of K4TCPPS solutions. This result also suggests that it is possible to use noble metal NPs to improve fluorescence concentration quenching.

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5

Shehata, Nader, Effat Samir, and Ishac Kandas. "Gold/QDs-Embedded-Ceria Nanoparticles: Optical Fluorescence Enhancement as a Quenching Sensor." Applied Sciences 10, no. 4 (February 12, 2020): 1236. http://dx.doi.org/10.3390/app10041236.

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This work focuses on improving the fluorescence intensity of cerium oxide (ceria) nanoparticles (NPs) through added plasmonic nanostructures. Ceria nanoparticles are fluorescent nanostructures which can emit visible fluorescence emissions under violet excitation. Here, we investigated different added plasmonic nanostructures, such as gold nanoparticles (Au NPs) and Cadmium sulfide/selenide quantum dots (CdS/CdSe QDs), to check the enhancement of fluorescence intensity emissions caused by ceria NPs. Different plasmonic resonances of both aforementioned nanostructures have been selected to develop optical coupling with both fluorescence excitation and emission wavelengths of ceria. In addition, different additions whether in-situ or post-synthesis have been investigated. We found that in-situ Au NPs of a 530 nm plasmonic resonance wavelength provides the highest fluorescence emissions of ceria NPs compared to other embedded plasmonic structures. In addition to the optical coupling between plasmonic resonance of Au with the visible emissions fluorescence spectrum of ceria nanoparticles, the 530 nm in-situ Au NPs were found to reduce the bandgap of ceria NPs. We suggest that the formation of more tri-valent cerium ions traps energy levels along with more associated oxygen vacancies, which is responsible for increasing the fluorescence visible emissions intensity caused by ceria. As an application, the gold-ceria NPs is shown to optically detect the varied concentration of iron tiny particles in aqueous medium based on a fluorescence quenching mechanism. This work is promising in different applications such as biomarkers, cancer treatments, and environmental pollution monitoring.

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6

Fu, Miao-Miao, Lianshe Fu, and Guang-Hua Cui. "A robust 3D zinc(ii)–organic framework for efficient dual detection of acetylacetone and Tb3+ ions." Dalton Transactions 50, no. 29 (2021): 10180–86. http://dx.doi.org/10.1039/d1dt01112j.

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A fluorescent Zn(ii) MOF with a new 3D pillared framework was synthesized and characterized, which displays excellent stability, high sensitivity and selectivity for sensing of acac and Tb³⁺ ions through fluorescence quenching and enhancement effects, respectively.

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7

Jiang, Yao-Wen, Ge Gao, Zhan Chen, and Fu-Gen Wu. "Fluorescence studies on the interaction between chlorpromazine and model cell membranes." New Journal of Chemistry 41, no. 10 (2017): 4048–57. http://dx.doi.org/10.1039/c7nj00037e.

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8

Zhao, Fei, and Jongsung Kim. "Fabrication of a Dopamine Sensor Based on Carboxyl Quantum Dots." Journal of Nanoscience and Nanotechnology 15, no. 10 (October 1, 2015): 7871–75. http://dx.doi.org/10.1166/jnn.2015.11220.

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A quantum dot (QD)-based optical biosensor was developed to detect the activity of dopamine (DA) via the quenching of QD fluorescence intensity. In this study, we examined the fluorescence quenching of DA-conjugated quantum dots (DA@QDs) at various solution pH values. The fluorescence intensity of the QDs is quenched by electronic energy transfer from the QDs to the o-quinone group of dopamine oxide. The degree of fluorescence quenching was dependent on DA concentration. The influence of the external environment pH factor on fluorescence quenching was investigated. The results showed that the degree of fluorescence quenching of DA@QDs was highest in a slightly alkaline solution-pH of approximately 9. Fluorescence enhancement with increased pH appears to be due to electronic energy transfer, which is related to an increased degree of dopamine-o-quinone oxidation. The fluorescence quenching of QDs by DA is of considerable interest due to its potential for the direct detection of the DA in vivo via a simple procedure with a very low limit of detection.

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9

Yang, Manman, Xiaoli Xi, and Pin Yang. "Thermodynamic analysis of fluorescence enhancement and Quenching theory equations." Frontiers of Chemistry in China 3, no. 3 (April 30, 2008): 254–61. http://dx.doi.org/10.1007/s11458-008-0065-5.

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10

Shehata, Nader, Effat Samir, and Ishac Kandas. "Plasmonic-Ceria Nanoparticles as Fluorescence Intensity and Lifetime Quenching Optical Sensor." Sensors 18, no. 9 (August 27, 2018): 2818. http://dx.doi.org/10.3390/s18092818.

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Ceria nanoparticles have been recently used as an optical fluorescent material with visible emission under ultraviolet excitation, due to the formation of trivalent cerium ions with corresponding oxygen vacancies. This paper introduces the enhancement of both fluorescence emission and lifetime through adding gold nanoparticles. The reason is due to possible coupling between the plasmonic resonance of gold nanoparticles and the fluorescence emission of ceria that has been achieved, along with enhanced formation of trivalent cerium ions. Both factors lead to higher fluorescence intensity peaks and shorter fluorescence lifetimes. As an application, gold-ceria nanoparticles have been used as an optical sensing material for lead particles in aqueous media based on fluorescence quenching. Stern-Volmer constant of in-situ gold-ceria nanoparticles is found to be 2.424 M−1, with a relative intensity change of up to 40% at 0.2 g/L.

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11

Zolmajd-Haghighi, Zahra, and Quentin Hanley. "Enhancement, Equal Fluorescence Efficiency, and Quenching in the Interpretation of Fluorescence Anisotropy Data." Biophysical Journal 106, no. 2 (January 2014): 680a. http://dx.doi.org/10.1016/j.bpj.2013.11.3767.

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12

Zhang, Chuan-Lei, Zi-Teng Liu, Heng Xu, He-Gen Zheng, Jing Ma, and Jing Zhao. "An excellent example illustrating the fluorescence sensing property of cobalt–organic frameworks." Dalton Transactions 48, no. 7 (2019): 2285–89. http://dx.doi.org/10.1039/c9dt00005d.

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13

Wu, Ping-Chien, Chou-Yen Chen, and Chih-Wei Chang. "The fluorescence quenching and aggregation induced emission behaviour of silver nanoclusters labelled on poly(acrylic acid-co-maleic acid)." New Journal of Chemistry 42, no. 5 (2018): 3459–64. http://dx.doi.org/10.1039/c7nj04399f.

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14

Sathiyaraj, Munusamy, Kumaravelu Pavithra, and Viruthachalam Thiagarajan. "Azine based AIEgens with multi-stimuli response towards picric acid." New Journal of Chemistry 44, no. 20 (2020): 8402–11. http://dx.doi.org/10.1039/d0nj01324b.

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15

Liu, Xianhu, Yishi Wu, Shuanghao Li, Yan Zhao, Chengqian Yuan, Meiye Jia, Zhixun Luo, Hongbing Fu, and Jiannian Yao. "Quantum-size-effect accommodation of gold clusters with altered fluorescence of dyes." RSC Advances 5, no. 39 (2015): 30610–16. http://dx.doi.org/10.1039/c4ra17239f.

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16

Muddassir, Mohd, Abdullah Alarifi, Mohd Afzal, Khulud Abdullah Alshali, Naaser A. Y. Abduh, and Abeer Beagan. "A fluorescent Cu(ii) complex as a dual functional sensor for selective and sensitive detection of acetone and Cd(ii) pollutants." RSC Advances 10, no. 69 (2020): 42137–46. http://dx.doi.org/10.1039/d0ra08073j.

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The prepared complex 1 exhibited highly sensitive and selective fluorescence quenching (turn-off) effect in the presence of acetone as well as fluorescence enhancement (turn-on) effect toward Cd²⁺ ions in aqueous solutions.

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17

Wang, Wei-Xian, Yee-Wai Cheung, Roderick M. Dirkzwager, Wai-Chung Wong, Julian A. Tanner, Hong-Wei Li, and Yuqing Wu. "Specific and sensitive detection of Plasmodium falciparum lactate dehydrogenase by DNA-scaffolded silver nanoclusters combined with an aptamer." Analyst 142, no. 5 (2017): 800–807. http://dx.doi.org/10.1039/c6an02417c.

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18

Yi, Fei-Yan, Ying Wang, Jian-Ping Li, Dai Wu, Ya-Qian Lan, and Zhong-Ming Sun. "An ultrastable porous metal–organic framework luminescent switch towards aromatic compounds." Materials Horizons 2, no. 2 (2015): 245–51. http://dx.doi.org/10.1039/c4mh00210e.

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19

Wang, Sheng, Hu-Chao Su, Lan Yu, Xiao-Wei Zhao, Li-Wen Qian, Qin-Yu Zhu, and Jie Dai. "Fluorescence and energy transfer properties of heterometallic lanthanide-titanium oxo clusters coordinated with anthracenecarboxylate ligands." Dalton Transactions 44, no. 4 (2015): 1882–88. http://dx.doi.org/10.1039/c4dt02968b.

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20

PAN DUO-MAI, MIAO REN-CAI, LI XIU-YING, and ZHANG PENG-XIANG. "FLUORESCENCE ENHANCEMENT OR QUENCHING OF MOLECULE AT SERS ACTIVE SURFACES." Acta Physica Sinica 38, no. 6 (1989): 965. http://dx.doi.org/10.7498/aps.38.965.

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21

YANG, Manman. "The equal-efficiency-proving of fluorescence quenching and enhancement equation." Chinese Science Bulletin 50, no. 22 (2005): 2571. http://dx.doi.org/10.1360/982005-499.

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22

Yang, Manman, Xiaoli Xi, and Pin Yang. "The equal-efficiency-proving of fluorescence quenching and enhancement equation." Chinese Science Bulletin 50, no. 22 (November 2005): 2571–74. http://dx.doi.org/10.1007/bf03183652.

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23

Kopchuk, Dmitry S., Dmitry E. Pavlyuk, Igor S. Kovalev, Grigory V. Zyryanov, Vladimir L. Rusinov, and Oleg N. Chupakhin. "Synthesis of a new DTTA- and 5-phenyl-2,2′-bipyridine-based ditopic ligand and its Eu3+ complex." Canadian Journal of Chemistry 94, no. 7 (July 2016): 599–603. http://dx.doi.org/10.1139/cjc-2015-0576.

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A new ditopic ligand based on diethylenetriamine-N,N,N″,N″-tetraacetate (DTTA) and 5-phenyl-2,2′-bipyridine has been synthesized. The improved method for the synthesis of DTTA tert-butyl ester has been developed. The water-soluble Eu3+*DTTA complex of this ligand has been prepared, and its photophysical properties have been studied. Due to the presence of an extra chelating unit, 5-phenyl-2,2′-bipyridine, this Eu3+*DTTA complex demonstrated a strong fluorescence response to the Zn2+ cation (fluorescence enhancement) and the simultaneous fluorescent and phosphorescent response (fluorescence and phosphorescence quenching) to the Cu2+ or Ni2+ cations in aqueous solutions.

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24

Su, Yue, Wei Shi, Xin Chen, Shiyu Zhao, Yonghai Hui, and Zhengfeng Xie. "An aggregation-induced emission enhancement fluorescent benzoxazine-derived macromolecule: catalyst-free synthesis and its preliminary application for the determination of aqueous picric acid." RSC Advances 6, no. 47 (2016): 41340–47. http://dx.doi.org/10.1039/c6ra06942h.

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An aggregation-induced emission enhancement macromolecular benzoxazine derivative was synthesized by a catalyst-free Mannich reaction and showed a fluorescence quenching response towards nitro compounds.

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25

Kim, Soojin, Jin Young Noh, Sol Ji Park, Yu Jeong Na, In Hong Hwang, Jisook Min, Cheal Kim, and Jinheung Kim. "Selective fluorescence assay of aluminum and cyanide ions using chemosensor containing naphthol." RSC Adv. 4, no. 35 (2014): 18094–99. http://dx.doi.org/10.1039/c4ra01245c.

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The selective assay of aluminum and cyanide ions is reported using fluorescence enhancement and quenching of a phenol–naphthol based chemosensor (PNI) in aqueous and nonaqueous solvents, respectively.

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26

Li, Liang, Qiang Chen, Zhigang Niu, Xinhui Zhou, Tao Yang, and Wei Huang. "Lanthanide metal–organic frameworks assembled from a fluorene-based ligand: selective sensing of Pb2+ and Fe3+ ions." Journal of Materials Chemistry C 4, no. 9 (2016): 1900–1905. http://dx.doi.org/10.1039/c5tc04320d.

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A series of fluorene-based Ln-MOFs with 3D neutral network are reported. Eu-MOF can act as the highly sensitive sensor to Pb²⁺ and Fe³⁺ ions in aqueous solution by fluorescence enhancement and quenching, respectively. The dynamic and static quenching constants of Fe³⁺ are obtained.

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27

Wu, Qi, Peiling Dai, Yun Wang, Jin Zhang, Meng Li, Kenneth Yin Zhang, Shujuan Liu, Wei Huang, and Qiang Zhao. "Time-resolved analysis of photoluminescence at a single wavelength for ratiometric and multiplex biosensing and bioimaging." Chemical Science 12, no. 33 (2021): 11020–27. http://dx.doi.org/10.1039/d1sc02811a.

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A single-wavelength dual-emissive polymeric probe shows fluorescence enhancement toward ClO− and phosphorescence quenching toward O2, allowing simultaneously imaging cellular ClO− and O2via time-resolved photoluminescence imaging microscopy.

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28

Wiwatowski, Kamil, Paweł Podlas, Magdalena Twardowska, and Sebastian Maćkowski. "Fluorescence Studies of the Interplay between Metal-Enhanced Fluorescence and Graphene-Induced Quenching." Materials 11, no. 10 (October 9, 2018): 1916. http://dx.doi.org/10.3390/ma11101916.

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Fluorescence microscopy and spectroscopy were applied for studying the optical properties of a hybrid nanostructure, in which we combine plasmon-induced metal enhanced fluorescence with energy transfer to epitaxial graphene. Covering the layer of silver islands with a monolayer graphene, while turning on the efficient energy transfer from emitters, only moderately affects the enhancement of fluorescence attributed to the plasmon resonance in metallic nanostructures—as evidenced by the analysis of fluorescence decays. The results show that it is feasible to combine the properties of graphene with metal-enhanced fluorescence. The importance of the layer thickness of the emitters is also pointed out.

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29

Fura, Gizaw D., Yong Long, Jun Yan, Wei Chen, Chang-Gen Lin, and Yu-Fei Song. "Synthesis, structural characterization and fluorescence enhancement of chromophore-modified polyoxometalates." Acta Crystallographica Section C Structural Chemistry 74, no. 11 (October 16, 2018): 1260–66. http://dx.doi.org/10.1107/s2053229618009361.

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Intramolecular charge transfers between π-conjugated molecules and polyoxometalate (POM) clusters have been observed in donor–acceptor systems based on organic donors and inorganic POM acceptors, which unfortunately results in a general quenching of the chromophore luminescence. The development of POM–chromophore dyads that are capable of tackling the quenching process and enhancing the fluorescence intensity of such systems remains a highly challenging area of study. A family of organic–inorganic polyoxometalate <!?tlsb=-0.2pt>hybrids, {[(n-C4H9)4N]3[(MnMo6O24){(CH2)3CR}2]} [1, R = –NHCH2C14H9, namely (anthracen-9-ylmethyl)amino; 2, R = –NHCH2C13H9, (9H-fluoren-2-ylmethyl)amino; 3, R = –NHCH2C10H7, (naphthalen-2-ylmethyl)amino; 4, R = –NHCH2C16H9, (pyren-2-ylmethyl)amino], were synthesized by covalently tethering π-conjugated molecules onto an Anderson cluster. The resulting POM–chromophore dyads were fully characterized by various spectroscopic techniques, single-crystal X-ray diffraction analysis and ESI–MS. The fluorescence features of these dyads were studied in detail to verify a dramatic emission enhancement that can be achieved by fine-tuning the microenvironment in solution and suppressing the intrinsic photo-induced electron-transfer process.

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30

Li, Qiao, Yang Zhao, and Enju Wang. "Benzothiazolylhydrazone-Based Turn-on Fluorescent Probe for Detecting Cu2+: S-donor as a Cu2+-induced Fluorescence Quenching Inhibitor." Acta Chimica Slovenica 68, no. 3 (September 15, 2021): 562–66. http://dx.doi.org/10.17344/acsi.2020.6324.

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The fluorescent turn-on detection of metal ions is highly desirable for public health and environmental security. Herein, we report a rationally designed fluorescent probe (1) for the detection of Cu2+ synthesized by integrating 2-hydrazinylbenzothiazole with 3-acetyl-7-hydroxycoumarin. The probe alone is non-fluorescent due to the isomerization of C=N in the excited state. The addition of Cu2+ can cause a delayed fluorescence enhancement. A comparative study of 1 and its analogues indicated that the turn-on fluorescence response was thanks to the sulfur atom coordinating to Cu2+. The response delay of 1 in sensing Cu2+ was ascribed to the gradual transition from N-coordination to S-coordination (N and S in thiazole moiety). The proposed new function of S-donor would provide a new approach for the turn-on fluorescence sensation of Cu2+.

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31

Xie, Fang, Anthony Centeno, Mary R. Ryan, D. Jason Riley, and Neil M. Alford. "Au nanostructures by colloidal lithography: from quenching to extensive fluorescence enhancement." J. Mater. Chem. B 1, no. 4 (2013): 536–43. http://dx.doi.org/10.1039/c2tb00278g.

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32

Aldred, Matthew P., Chong Li, Guo-Feng Zhang, Wen-Liang Gong, Alexander D. Q. Li, Yanfeng Dai, Dongge Ma, and Ming-Qiang Zhu. "Fluorescence quenching and enhancement of vitrifiable oligofluorenes end-capped with tetraphenylethene." Journal of Materials Chemistry 22, no. 15 (2012): 7515. http://dx.doi.org/10.1039/c2jm30261f.

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33

Kang, Kyung A., Jianting Wang, Jacek B. Jasinski, and Samuel Achilefu. "Fluorescence Manipulation by Gold Nanoparticles: From Complete Quenching to Extensive Enhancement." Journal of Nanobiotechnology 9, no. 1 (2011): 16. http://dx.doi.org/10.1186/1477-3155-9-16.

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34

Fabbrizzi, Luigi, Maurizio Licchelli, Piersandro Pallavicini, Donatella Sacchi, and Angelo Taglietti. "Sensing of transition metals through fluorescence quenching or enhancement. A review." Analyst 121, no. 12 (1996): 1763. http://dx.doi.org/10.1039/an9962101763.

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35

Jones, Elliot B., Donald J. Nelson, and Mark M. Turnbull. "Enhancement and quenching of fluorescence of Quin-2 by metal ions." Journal of Inorganic Biochemistry 45, no. 2 (February 1992): 85–92. http://dx.doi.org/10.1016/0162-0134(92)80002-d.

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36

Zhao, Yan, Yijian Jiang, and Yan Fang. "Quenching and enhancement of fluorescence of fullerene molecules on gold particle." Chemical Physics 323, no. 2-3 (April 2006): 169–72. http://dx.doi.org/10.1016/j.chemphys.2005.09.034.

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37

Liaw, Jiunn-Woei, Hsiao-Yen Tsai, and Chun-Hui Huang. "Size-Dependent Surface Enhanced Fluorescence of Gold Nanorod: Enhancement or Quenching." Plasmonics 7, no. 3 (March 18, 2012): 543–53. http://dx.doi.org/10.1007/s11468-012-9341-9.

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38

Ha, Chu Viet, J. C. Brochon, and Tran Hong Nhung. "Influence of Surface Plasmon Resonance on Fluorescence Emission of Dye-doped Nanoparticles." Communications in Physics 24, no. 3S2 (April 20, 2016): 121–29. http://dx.doi.org/10.15625/0868-3166/24/3s2/5057.

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The influence of the surface plasmon of gold nanoparticles on the optical properties of the fluorescent nanoparticles in aqueous solution have been investigated. The fluorescence of nanoparticles can be enhanced or quenched in the presence of gold nanoparticles depending on the domination of energy transfer mechanisms: radiating surface plasmon coupling emission or F\"{o}rster energy transfer from fluorescent particles to gold particles, which exciting absorbing plasmon. The fluorescence enhancement or quenching is attributed to the increase or decrease of radiative recombination rates, respectively. The parameters of the energy transfer between fluorescent nanoparticles (dye molecules encapsulated in silica nanoparticles) and nano golds have been estimated. The results show that the interactions between nanoparticles depend on the size of both fluorophores (as donors) and gold nanoparticles (as acceptors).

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Ramachandran, Mohanraj, and Sambandam Anandan. "Triazole appending ruthenium(ii) polypyridine complex for selective sensing of phosphate anions through C–H–anion interaction and copper(ii) ions via cancer cells." New Journal of Chemistry 44, no. 16 (2020): 6186–96. http://dx.doi.org/10.1039/d0nj00273a.

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Selective fluorescence enhancement by H₂PO₄⁻/H₂P₂O₇²⁻ anions and maximum fluorescence quenching by Cu²⁺ ions were attained upon treatment with different types of anions and cations, respectively.

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40

Gong, Jin Dong, Wei Zhang, Ping Shen, Ming Xun Yan, and Chang Ying Yang. "Photo-Induced Fluorescence Enhancement of BOPIM–dma in Moderate Polar Solvents." Applied Mechanics and Materials 488-489 (January 2014): 193–96. http://dx.doi.org/10.4028/www.scientific.net/amm.488-489.193.

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The photo-induced fluorescence enhancement for a BOPIM derivate, which was found weak or no fluorescence in solvents due to twisted intramolecular charge transfer (TICT) was investigated. The quenching process because of TICT state is substantially removed and fluorescence emission intensity increased remarkably, induced by UV-irradiation. This phenomenon could only found in moderate polar solvent, such as CHCl3, THF and 1, 4-dioxane (DIOX), but not in more polarity solvent, such as CH3CN, CH3OH. It is indicated that the transformation from TICT to ICT state take place easily in moderate polar solvents.

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41

Walhorn, Volker, Jan Paskarbeit, Heinrich Gotthard Frey, Alexander Harder, and Dario Anselmetti. "Distance dependence of near-field fluorescence enhancement and quenching of single quantum dots." Beilstein Journal of Nanotechnology 2 (September 29, 2011): 645–52. http://dx.doi.org/10.3762/bjnano.2.68.

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In fluorescence microscopy and spectroscopy, energy transfer processes between single fluorophores and fluorophore quencher pairs play an important role in the investigation of molecular distances or orientations. At distances larger than about 3 nm these effects originate predominantly from dipolar coupling. As these experiments are commonly performed in homogenous media, effects at the interface boundaries can be neglected. Nevertheless, the combination of such assays with single-molecule manipulation techniques such as atomic force microscopy (AFM) requires a detailed understanding of the influence of interfaces on dipolar coupling effects. In the presented work we used a combined total internal reflection fluorescence microscopy (TIRFM)–AFM setup to elucidate this issue. We measured the fluorescence emission emanating from single quantum dots as a function of distance from the apex of a gold-coated cantilever tip. As well as fluorescence quenching at close proximity to the tip, we found a nonlinear and nonmonotonic distance dependence of the fluorescence emission. To confirm and interpret our findings we performed calculations on the basis of a simplified multiple multipole (MMP) approach, which successfully supports our experimental data. Moreover, we revealed and quantified the influence of interfering processes such as field enhancement confined at interface boundaries, mirror dipoles and (resonant) dipolar coupling.

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42

Zhu, Xianwei, and Hiroaki Shinohara. "Fluorescence Enhancement of Fluorescent Unnatural Streptavidin by Binding of a Biotin Analogue with Spacer Tail and Its Application to Biotin Sensing." Scientific World Journal 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/165369.

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We designed a novel molecular biosensing system for the detection of biotin, an important vitamin by the combination of fluorescent unnatural streptavidin with a commercialized biotin-(AC5)2-hydrazide. A fluorescent unnatural amino acid, BODIPY-FL-aminophenylalanine (BFLAF), was position-specifically incorporated into Trp120 of streptavidin by four-base codon method. Fluorescence of the Trp120BFLAF mutant streptavidin was enhanced by the addition of biotin-(AC5)2-hydrazide with the concentration dependent, whereas fluorescence enhancement was not observed at all by the addition of natural biotin. It was considered that the spacer tail of biotin-(AC5)2-hydrazide may disturb the fluorescence quenching of the Trp120BFLAF by Trp79 and Trp108 of the neighbor subunit. Therefore, biotin sensing was carried out by the competitive binding reaction of biotin-(AC5)2-hydrazide and natural biotin to the fluorescent mutant streptavidin. The fluorescence intensity decreased by increasing free biotin concentration. The result suggested that molecular biosensor for small ligand could be successfully designed by the pair of fluorescent mutant binding protein and ligand analogue.

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Li, Na, Liyan Liu, Huiqing Luo, Huaqiao Wang, Depo Yang, and Feng He. "Flavanone-Based Fluorophores with Aggregation-Induced Emission Enhancement Characteristics for Mitochondria-Imaging and Zebrafish-Imaging." Molecules 25, no. 14 (July 21, 2020): 3298. http://dx.doi.org/10.3390/molecules25143298.

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Fluorophores with aggregation-induced emission enhancement (AIEE) characteristics applied in bioimaging have attracted more and more attention in recent years. In this work, a series of flavanone compounds with AIEE characteristics was developed and applied to fluorescence imaging of mitochondria and zebrafish. The compounds were readily prepared by the thermal dehydration of chalcone that was obtained by the reaction of o-hydroxyacetophenone and benzaldehyde. Two of these compounds showed significant AIEE characteristics by fluorescence performance experiments, including optical spectra, fluorescence spectra, fluorescence quantum yield (φF), fluorescence lifetime, and scanning electron microscopy (SEM). Compared with traditional organic fluorescent dyes, these compounds have high fluorescence emission and high fluorescence quantum yield in solid or aggregated state, which overcomes the shortcoming of aggregation-caused quenching (ACQ). More importantly, the two compounds exhibited low cytotoxicity and good cytocompatibility in A549 lung cells at the experimental concentration range and they specifically targeted mitochondria, which make it of great potential use in mitochondria labeling. In addition, they were embryonic membrane permeable and had different affinities for different tissues and organs of zebrafish, but mainly distributed in the digestive system, providing a basis for the application of such compounds in bioimaging. These AIEE compounds with superior properties could be of great potential use in mitochondria imaging and other in vivo studies.

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Wu, Hsing-Ju, and Cheng-Chung Chang. "Fabrication of Double Emission Enhancement Fluorescent Nanoparticles with Combined PET and AIEE Effects." Molecules 25, no. 23 (December 4, 2020): 5732. http://dx.doi.org/10.3390/molecules25235732.

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The major challenge in the fabrication of fluorescent silica nanoparticles (FSNs) based on dye-doped silica nanoparticles (DDSNs) is aggregation-caused fluorescence quenching. Here, we constructed an FSN based on a double emission enhancement (DEE) platform. A thio-reactive fluorescence turn-on molecule, N-butyl-4-(4-maleimidostyryl)-1,8-naphthalimide (CS), was bound to a silane coupling agent, (3-mercaptopropyl)-trimethoxysilane (MPTMS), and the product N-butyl-4-(3-(trimethoxysilyl-propylthio)styryl)-1,8-naphthalimide (CSP) was further used to fabricate a core–shell nanoparticle through the Stöber method. We concluded that the turn-on emission by CSP originated from the photoinduced electron transfer (PET) between the maleimide moiety and the CSP core scaffold, and the second emission enhancement was attributed to the aggregation-induced emission enhancement (AIEE) in CSP when encapsulated inside a core–shell nanoparticle. Thus, FSNs could be obtained through DEE based on a combination of PET and AIEE effects. Systematic investigations verified that the resulting FSNs showed the traditional solvent-independent and photostable optical properties. The results implied that the novel FSNs are suitable as biomarkers in living cells and function as fluorescent visualizing agents for intracellular imaging and drug carriers.

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Qin, Haiyan, Diao Ma, and Jianxiu Du. "Distance dependent fluorescence quenching and enhancement of gold nanoclusters by gold nanoparticles." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 189 (January 2018): 161–66. http://dx.doi.org/10.1016/j.saa.2017.08.025.

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Matveeva, Evgenia G., Tanya Shtoyko, Ignacy Gryczynski, Irina Akopova, and Zygmunt Gryczynski. "Fluorescence quenching/enhancement surface assays: Signal manipulation using silver-coated gold nanoparticles." Chemical Physics Letters 454, no. 1-3 (March 2008): 85–90. http://dx.doi.org/10.1016/j.cplett.2008.01.075.

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Lee, Chunghyun, and Jongback Gang. "Fluorescence Quenching and Enhancement of DNA-Templated Silver Nanocluster by DNA Hybridization." Journal of Nanoscience and Nanotechnology 17, no. 11 (November 1, 2017): 7961–65. http://dx.doi.org/10.1166/jnn.2017.15077.

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Azoulay, J., A. Débarre, A. Richard, and P. Tchénio. "Quenching and enhancement of single-molecule fluorescence under metallic and dielectric tips." Europhysics Letters (EPL) 51, no. 4 (August 15, 2000): 374–80. http://dx.doi.org/10.1209/epl/i2000-00504-y.

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Chang, Guang, Xin Yu, Jiangbo Peng, Yang Yu, Zhen Cao, Long Gao, Minghong Han, and Guohua Wu. "Absorption, quenching, and enhancement by tracer in acetone/toluene laser-induced fluorescence." Chinese Physics B 29, no. 12 (December 2020): 124212. http://dx.doi.org/10.1088/1674-1056/abb3e1.

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Yang, JiDong, and Shang Zhou. "The fluorescence quenching and resonance Rayleigh scattering enhancement of ET-CPM system." Science Bulletin 54, no. 10 (May 2009): 1685–89. http://dx.doi.org/10.1007/s11434-009-0161-z.

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