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Journal articles on the topic 'Stern-Volmer Plot'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Sidarai, Ashok H., Vani R. Desai, Shirajahammad M. Hunagund, Mahantesha Basanagouda, and Jagadish S. Kadadevarmath. "Effect of solvent polarity on the fluorescence quenching of TMC molecule by aniline in benzene–acetonitrile mixtures." Canadian Journal of Physics 94, no. 11 (2016): 1125–32. http://dx.doi.org/10.1139/cjp-2016-0213.

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The fluorescence quenching of coumarin derivative, 6-methoxy-4-p-tolyloxymethyl-chromen-2-one by aniline is carried out in different solvent mixtures of benzene and acetonitrile at room temperature. The quenching is found to be appreciable and a positive deviation from linearity is observed in the Stern–Volmer plot in all the solvent mixtures. Various rate constants for fluorescence quenching processes have been estimated using a sphere of action static quenching model and a finite sink approximation model. From the positive deviation of linear Stern–Volmer plots and dependence of rate constan

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2

Thipperudrappa, J., and S. M. Hanagodimath. "Analysis of Fluorescence Quenching of BPBD by Aniline in Toluene." Mapana - Journal of Sciences 12, no. 1 (2013): 87–98. http://dx.doi.org/10.12723/mjs.24.8.

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Fluorescence quenching of 2-(4'-t-Butylphenyl)-5-(4"-biphenylyl)-1,3,4-oxadiazole (BPBD) by aniline in toluene has been carried out at room temperature by steady state and time resolved fluorescence spectroscopy. The Stern-Volmer plot by steady state method has been found to be non-linear showing a positive deviation, whereas by time-resolved method it is linear. In order to interpret these results we have used the ground state complex and sphere of action static quenching models. Using these models various rate parameters have been determined. Based on these models, with finite sink approxima

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3

Yang, Yu, та Edward P. C. Lai. "Optimization of Molecularly Imprinted Polymer Method for Rapid Screening of 17β-Estradiol in Water by Fluorescence Quenching". International Journal of Analytical Chemistry 2011 (2011): 1–8. http://dx.doi.org/10.1155/2011/214747.

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A new method was optimized for rapid screening of 17β-estradiol (E2) in water under 10 min. Molecularly imprinted polymer (MIP) particles (325 ± 25 nm) were added in a water sample at pH 5.5 and 20∘C to form a suspension. Fluorescence emission from E2 nonspecifically bound onto the MIP particles was first quenched by large gold nanoparticles (43 ± 5 nm). The Stern-Volmer plot was linear, with dynamic quenching constants (Ksv) of 2.9 ×104 M-1. Fluorescence emission from E2 specifically bound inside the MIP particles was next quenched by small nitrite anions that easily penetrated the imprinted

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4

Janosi, Tibor Zoltan, Jouko Korppi-Tommola, Zsolt Csok, Laszlo Kollar, Pasi Myllyperkio, and Janos Erostyak. "Anthracene Fluorescence Quenching by a Tetrakis (Ketocarboxamide) Cavitand." Journal of Spectroscopy 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/708739.

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Quenching of both fluorescence lifetime and fluorescence intensity of anthracene was investigated in the presence of a newly derived tetrakis (ketocarboxamide) cavitand at various concentrations. Time-correlated single photon counting method was applied for the lifetime measurements. A clear correlation between the fluorescence lifetime of anthracene as a function of cavitand concentration in dimethylformamide solution was observed. The bimolecular collisional quenching constant was derived from the decrease of lifetime. Fluorescence intensity was measured in the emission wavelength region aro

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5

Pan, Bo, Baoshan Xing, Wenxin Liu, Guanhua Xing, and Shu Tao. "Investigating interactions of phenanthrene with dissolved organic matter: Limitations of Stern–Volmer plot." Chemosphere 69, no. 10 (2007): 1555–62. http://dx.doi.org/10.1016/j.chemosphere.2007.05.059.

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6

Ture, Satish Ashok, Shruthy D. Pattathil, Bertrand Zing Zing, and Venkataraman Abbaraju. "Fluorescence Sensing of Some Important Nitroaromatic Compounds by Using Polyaniline Ag Composite." Micro 3, no. 1 (2023): 224–38. http://dx.doi.org/10.3390/micro3010016.

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Conducting polymers (CPs) have contributed significantly to the field of sensing. The sensing of nitroaromatic compounds by fluorescence has recently gained more attention due to its sensitivity and selectivity. In this study, polyaniline (PANI) was functionalized by forming a polyaniline-Ag (PANI-Ag) composite and used as a fluorophore for sensing. The nitro groups present in nitroaromatic compounds (NACs) such as 2,4,6-trinitrophenol (picric acid-TNP) and Dinitrobenzene (DNB) act as electron-accepting molecules and quench the fluorescence of polymer chains by showing an amplified quenching e

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7

Ciotta, E., P. Prosposito, and R. Pizzoferrato. "Positive curvature in Stern-Volmer plot described by a generalized model for static quenching." Journal of Luminescence 206 (February 2019): 518–22. http://dx.doi.org/10.1016/j.jlumin.2018.10.106.

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8

Thanikaivalan, E., and R. Jothilakshmi. "Quenching of Silver Nanoparticles." Materials Science Forum 781 (March 2014): 135–44. http://dx.doi.org/10.4028/www.scientific.net/msf.781.135.

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Silver nanoparticles of different sizes have been prepared. Absorption spectroscopy reveals the formation of ground state complex. Fluorescence spectroscopy has been used to study the signatures of fluorescence quenching. Properties of N-(2-methylthiophenyl)-2-hydroxy-1-naphthaldimine (NMTHN) on silver nanoparticles has been investigated using optical absorption and fluorescence emission techniques. Quenching of fluorescence of N-(2-methylthiophenyl)-2-hydroxy-1-naphthaldimine has been found to decrease with increase in the size of the silver nanoparticles. The results of the quenching experim

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9

Hamity, M., and R. H. Lema. "The photochemistry of electron donor–acceptor (EDA) complexes in micellar solutions. I. The stilbene–methylviologen system." Canadian Journal of Chemistry 66, no. 7 (1988): 1552–57. http://dx.doi.org/10.1139/v88-252.

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The association constants for the electron donor–acceptor (EDA) complexes formed between both cis-stilbene (cS) and trans-stilbene (tS) as donors and methylviologen (MV+2) as acceptor were determined in ethanol and micellar sodium dodecyl sulfate (SDS) solutions in the range of SDS concentration 0.05–0.1 M. The values obtained in micellar solutions were much higher than those in ethanol and were heavily dependent upon SDS concentration. This effect is due to an increase in the local concentration of the reactants in the micellar pseudophase. The tS fluorescence quenching by MV+2 was also studi

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10

Yu, Wenwei, Qiaoyun Yang, Yujing Chen, Hongjie Li, and Yantang Huang. "Optical fiber liquefied petroleum gas sensor based on the fluorescence quenching of CdSe quantum dot." Journal of Physics: Conference Series 2896, no. 1 (2024): 012024. https://doi.org/10.1088/1742-6596/2896/1/012024.

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Abstract A flameproof optical fiber liquefied petroleum gas sensor was designed and fabricated. Bare-core CdSe and CdSe@ZnSeS@ZnS@CdZnS were modified with pentafluorobenzoic acid (FBA) and encapsulated in PMMA as fluorescent probes for liquefied petroleum gas, enhancing the quantum dots’ response to liquefied petroleum gas detection. Both materials exhibited significant fluorescence quenching in the presence of liquefied petroleum gas, with the Stern-Volmer plot showing a good linear relationship with the gas. A detection optical path was designed, and the relationship between fluorescence int

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11

Sidarai, Ashok H., Vani R. Desai, Shirajahammad M. Hunagund, Mahantesha Basanagouda, and Jagadish S. Kadadevarmath. "Fluorescence Quenching of DMB by Aniline in Benzene-Acetonitrile Mixture." International Letters of Chemistry, Physics and Astronomy 65 (April 2016): 32–36. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.65.32.

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The fluorescence quenching of coumarin dye namely 4-(2,6-dibromo-4-methyl-phenoxymethyl)-benzo[h]chromen-2-one [DMB] has been studied by aniline, in a different solvent mixture of benzene (BN) and acetonitrile (AN) at room temperature. The quenching is found to be appreciable and shows positive deviation from linearity in the Stern-Volmer (S-V) plots for all the solvent mixtures. The various rate parameters responsible for fluorescence quenching have been determined using a sphere of action static quenching model and finite sink approximation model. The magnitudes of these rate parameters indi

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12

Sidarai, Ashok H., Vani R. Desai, Shirajahammad M. Hunagund, Mahantesha Basanagouda, and Jagadish S. Kadadevarmath. "Fluorescence Quenching of DMB by Aniline in Benzene-Acetonitrile Mixture." International Letters of Chemistry, Physics and Astronomy 65 (April 6, 2016): 32–36. http://dx.doi.org/10.56431/p-c6f4hc.

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The fluorescence quenching of coumarin dye namely 4-(2,6-dibromo-4-methyl-phenoxymethyl)-benzo[h]chromen-2-one [DMB] has been studied by aniline, in a different solvent mixture of benzene (BN) and acetonitrile (AN) at room temperature. The quenching is found to be appreciable and shows positive deviation from linearity in the Stern-Volmer (S-V) plots for all the solvent mixtures. The various rate parameters responsible for fluorescence quenching have been determined using a sphere of action static quenching model and finite sink approximation model. The magnitudes of these rate parameters indi

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13

AMAO, YUTAKA, KEISUKE ASAI, and ICHIRO OKURA. "Oxygen sensing based on lifetime of photoexcited triplet state of platinum porphyrin-polystyrene film using time-resolved spectroscopy." Journal of Porphyrins and Phthalocyanines 04, no. 03 (2000): 292–99. http://dx.doi.org/10.1002/(sici)1099-1409(200004/05)4:3<292::aid-jpp216>3.0.co;2-w.

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Optical oxygen-sensing systems based on the quenching of the photoexcited triplet state of platinum porphyrins—platinum octaethylporphyrin (PtOEP) and platinum tetrakis(pentafluorophenyl)porphyrin (PtTFPP)—in polystyrene (PS) using two different time-resolved spectroscopies (luminescence lifetime measurement and diffuse reflectance laser flash photolysis) have been developed. Using both spectroscopies, the same values of Stern-Volmer constant KSV and quenching rate constant kq (KSV = kqτ0) are obtained. The decays of the luminescence and triplet-triplet reflectance of the platinum porphyrins i

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14

Concepcion, Carlos Antonio, Maritess Lacquio, Milagros Peralta, and Mariam Recuenco. "Synthesis of Gold Nanoparticles (AuNPs) Using Salt-Soluble Wheat Flour Proteins and Their Use in the Fluorescence-based Sensing of Folic Acid." KIMIKA 33, no. 2 (2022): 44–58. http://dx.doi.org/10.26534/kimika.v33i2.44-58.

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Protein-stabilized metal nanoparticles have been receiving significant attention because their optical properties could be used for sensing applications. This study describes the synthesis of gold nanoparticles (AuNPs) stabilized with salt-soluble proteins extracted from wheat flour, and their use in the fluorescence-based detection and quantification of folic acid. The salt-soluble protein extract from defatted wheat flour contained at least eight components with molecular weights ranging from 7.26 to 57.0 kDa. The extract was made alkaline and then mixed with a HAuCl4 solution to synthesize

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15

J, Thipperudrappa. "Study of Role of Silver Nanoparticles on Spectroscopic Properties of a KetocyanineDye." Mapana - Journal of Sciences 15, no. 1 (2016): 1–16. http://dx.doi.org/10.12723/mjs.36.1.

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The role of silver nanoparticles on spectroscopic properties of the ketocyaninedye 2,5-di[(E)-1-(4- dimethylaminophenyl) methylidine]-1-cyclopentanone (2,5-DMAPMC) has been investigated using absorption and fluorescence spectroscopy. Silver nanoparticles are synthesized by chemical reduction method and estimated size from SEM measurements is 22 nm. The changes in absorption spectrum of dye in the presence of silver nanoparticles suggest the possible interaction with silver nanoparticles. The Stern-Volmer plot of fluorescence quenching is found to be nonlinear showing positive deviation. The ma

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16

Baruah, Upama, Neelam Gogoi, Achyut Konwar, Manash Jyoti Deka, Devasish Chowdhury, and Gitanjali Majumdar. "Carbon Dot Based Sensing of Dopamine and Ascorbic Acid." Journal of Nanoparticles 2014 (December 29, 2014): 1–8. http://dx.doi.org/10.1155/2014/178518.

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We demonstrate carbon dot based sensor of catecholamine, namely, dopamine and ascorbic acid. Carbon dots (CDs) were prepared from a green source: commercially available Assam tea. The carbon dots prepared from tea had particle sizes of ∼0.8 nm and are fluorescent. Fluorescence of the carbon dots was found to be quenched in the presence of dopamine and ascorbic acid with greater sensitivity for dopamine. The minimum detectable limits were determined to be 33 μM and 98 μM for dopamine and ascorbic acid, respectively. The quenching constants determined from Stern-Volmer plot were determined to be

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17

Martins, Cátia D. F., M. Manuela M. Raposo, and Susana P. G. Costa. "Intermolecular Quenching of Edans/Dabcyl Donor–Acceptor FRET Pair." Proceedings 41, no. 1 (2019): 34. http://dx.doi.org/10.3390/ecsoc-23-06613.

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The intermolecular quenching between 5-(2′-aminoethyl)aminonaphthalene sulfonic acid (Edans) and 4-[[4′-(N,N-dimethylamino)phenyl]diazenyl]benzoic acid (Dabcyl) was studied by photometric and fluorimetric measurements at pH 7.5 in phosphate buffer. The spectral properties of the Edans/Dabcyl donor–acceptor pair were determined and Dabcyl exhibited an intense absorption band at 463 nm, contributing to the quenching efficiency. We also found the primary requirement for fluorescence resonance energy transfer (FRET), the excellent overlap between the fluorescence emission spectrum of the donor mol

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18

Yuan, Yan-xia, Hong-shang Peng, Jian-tao Ping, Xiao-hui Wang, and Fang-tian You. "A Pyrene@Micelle Sensor for Fluorescent Oxygen Sensing." BioMed Research International 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/245031.

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For most fluorescent oxygen sensors developed today, their fabrication process is either time-consuming or needs specialized knowledge. In this work, a robust fluorescent oxygen sensor is facilely constructed by dissolving pyrene molecules into CTAB aqueous solution. The as-prepared pyrene@micelle sensors have submicron-sized diameter, and the concentration of utilized pyrene can be reduced as low as 0.8 mM but still can exhibit dominant excimer emission. The excimer fluorescence is sensitive to dissolved oxygen in both intensity and lifetime, and the respective Stern-Volmer plot follows a non

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19

Zhao, Yongkun, Hongxia Zhang, Qingwen Jin, Dagong Jia, and Tiegen Liu. "Ratiometric Optical Fiber Dissolved Oxygen Sensor Based on Fluorescence Quenching Principle." Sensors 22, no. 13 (2022): 4811. http://dx.doi.org/10.3390/s22134811.

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In this study, a ratiometric optical fiber dissolved oxygen sensor based on dynamic quenching of fluorescence from a ruthenium complex is reported. Tris(4,7-diphenyl-1,10-phenanthrolin) ruthenium(II) dichloride complex (Ru(dpp)32+) is used as an oxygen-sensitive dye, and semiconductor nanomaterial CdSe/ZnS quantum dots (QDs) are used as a reference dye by mixing the two substances and coating it on the plastic optical fiber end to form a composite sensitive film. The linear relationship between the relative fluorescence intensity of the ruthenium complex and the oxygen concentration is describ

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20

Souza, Geovany A., Diéricon S. Cordeiro, and Tatiana D. M. Ernter. "Steady-state and fluorescence lifetime quenching of self-assembled diphenylalanine/coumarin nanostructures as a method to determine dissolved O₂ in water." Advances in Natural Sciences: Nanoscience and Nanotechnology 14, no. 1 (2023): 015011. http://dx.doi.org/10.1088/2043-6262/acc735.

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Abstract A fluorescent system formed by the combination of coumarin derivative and self-assembled peptide nanostructures was used as sensing system to determine dissolved oxygen (O2) in water samples. Detection was based on the sensing system fluorescence quenching by O2, measured by steady-state and time-resolved fluorescence spectroscopy and Stern-Volmer plot to correlate fluorescence intensity to O2 concentration in the samples. Also, fluorescence lifetime decays informed about the mechanisms in which the quenching is occurring, indicating that the sensing system is highly sensitive and sel

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21

Deslauriers, Hélène, Sylvain Dufour, and Guy J. Collin. "La photochimie de l'isoprène gazeux dans la région de l'ultraviolet très lointain." Canadian Journal of Chemistry 66, no. 6 (1988): 1513–19. http://dx.doi.org/10.1139/v88-244.

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Yields of various products have been measured in the photolysis of isoprene at 184.9, 213.8, and 228.8 nm and at pressures between 1 and 400 Torr. At each wavelength, the major process is the rupture of a C—CH3 bond, which leads to the formation of methyl and CH2=C=CHCH2. The quantum yield for this process is 0.83 ± 0.08 at 213.8 nm. The lifetime of the intermediate involved in this process is 20 ns at 184.9 nm. Similar quantities of ethylene and C3H4[Formula: see text] and propene and acetylene [Formula: see text] are measured. All the measured yields decrease with an increase in the pressure

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22

Gehlen, Marcelo H. "The centenary of the Stern-Volmer equation of fluorescence quenching: From the single line plot to the SV quenching map." Journal of Photochemistry and Photobiology C: Photochemistry Reviews 42 (March 2020): 100338. http://dx.doi.org/10.1016/j.jphotochemrev.2019.100338.

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23

Joseph, Neethu. "Green Synthesized Fluorescent Nano-Carbon Derived from Indigofera Tinctora (L.) Leaf Extract for Sensing of Pb²⁺ Ions." ECS Transactions 107, no. 1 (2022): 15255–62. http://dx.doi.org/10.1149/10701.15255ecst.

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Plant-based synthesis of nanomaterials is a more reliable method since it is easy, quick, and environmentally friendly, and it does not require any specific conditions, unlike other methods. For the first time, we report the sensing of metal ions using a fluorescent nano-carbon material via a plant-based synthesis from the medicinal plant, Indigofera tinctora (L.) (IBLH). This nanomaterial from the leaf extract of IBLH was synthesized by hydrothermal assisted green synthesis method. The as-synthesized sample was characterized by various spectroscopic techniques for confirming the formation of

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24

Chatterjee, Poonam Mishra, Deepika Pandey Tiwari, Silpi Datta, Suman Chakrabarty, Ritu Raval, and Ashok Kumar Dubey. "Probing into Methylene Blue Interaction with Polyglutamic Acid: Spectroscopic and Molecular Dynamics Simulation Studies." Asian Journal of Chemistry 31, no. 9 (2019): 1949–58. http://dx.doi.org/10.14233/ajchem.2019.22100.

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Polyglutamic acid (PGA) is an anionic biopolymer which is stained with methylene blue (MB) in agar or polyacrylamide gels for analysis. Polyglutamic acid identification involves a tedious extraction and analytical process. The molecular association of polyglutamic acid and methylene blue can be used for rapid spectroscopic detection of polyglutamic acid production during fermentation. This triggered the study on investigation of polymer-dye interaction mechanism. Concentration range of polyglutamic acid, 0.001 to 0.06 μM with a fixed methylene blue concentration of 25 μM exhibited significant

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Kulkarni, Prashant A., Mahendra A. More, Vinod Nandre, and Anupa Kumbhar. "Investigations on sensing of picric acid in aqueous medium via fluorescence quenching of quinine sulfate." Modern Physics Letters B 34, no. 07n09 (2020): 2040040. http://dx.doi.org/10.1142/s0217984920400400.

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This research describes systematic investigations on sensing of high explosives such as picric acid (PA), RDX, NTO, and trinitrotoluene (TNT) in aqueous medium via fluorescence quenching of quinine sulfate (QS). Although all the explosives exhibit fluorescence quenching of QS, highest response is observed for PA. Fluorescence quenching of [Formula: see text][Formula: see text]50% (in contrast to pristine QS) at [Formula: see text][Formula: see text]390 nm is observed for 10 nm (2.29 [Formula: see text]g of PA dissolved in 20 [Formula: see text]l of distilled water). The analysis of the Stern–V

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Biplab, Mondal, Lohar Somenath, Pal Siddhartha, Maji Abhishek, and Chattopadhyay Pabitra. "A new chemosensor selective for Cu2+ ions through fluorescence quenching approach applicable to real samples." Journal of Indian Chemical Society Vol. 92, Dec 2015 (2015): 1867–74. https://doi.org/10.5281/zenodo.5599782.

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Department of Chemistry, The University of Burdwan, Golapbag, Burdwan-713 104, West Bengal, India <em>E-mail </em>: pabitracc@yahoo.com A new salen type Schiff base H<sub>2</sub>L has been developed as an efficient Cu<sup>2+</sup> ions selective turn-off chemosensor through metal chelation (1 : 1) in 1 mM HEPES buffer-ethanol (50%, v/v) solution at 25 ºC. The probe (H<sub>2</sub>L) was characterized by thorough physicochemical and spectroscopic studies, and the fluorescence quenching process due to the selective addition of Cu<sup>2+</sup> ions has been established by detailed Stern-Volme

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Patil, Shivaprasadagouda, Mahanthesh M. Basanagouda, Sudhir M. Hiremath, S. Christopher Jeyaseelan, Raghavendra K. Sali, and Ashok H. Sidarai. "Electrochemical Behaviour of Green Synthesized Silver Nanoparticles using Camellia sinensis Leaves: Impacts on Photophysical Behaviour of Benzofuran Derivative." Asian Journal of Chemistry 34, no. 12 (2022): 3197–205. http://dx.doi.org/10.14233/ajchem.2022.24014.

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Green synthesis of silver nanoparticles (AgNPs) using Camellia sinensis leaf extract was used as a reducing agent. Electrochemical studies of green synthesized AgNPs were investigated using the cyclic voltammetry technique. The effect of modifier composition, scan rate and various concentrations of AgNPs were studied. Photophysical approach of fluorescence emission study of N-(2,5-dimethylpyrrol- 1-yl)-2-(6-methoxy-benzofuran-3-yl)acetamide (DPMBA) dissolved in ethanol. Increasing the concentration of AgNPs decreases the fluorescence intensity and fluorescence lifetime of the DPMBA molecule. T

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Okazaki, Masaharu, Yutaka Tai, Keichi Nunome, and Kazumi Toriyama. "Excimer formation of pyrene as a probe to investigate the recombination of geminate pairs: effect of multicomponent recombination on Stern-Volmer plot." Chemical Physics Letters 171, no. 5-6 (1990): 537–41. http://dx.doi.org/10.1016/0009-2614(90)85259-f.

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Fraiji, Elie K., Timothy R. Cregan, and T. C. Werner. "Binding of 2-Acetylnaphthalene to Cyclodextrins Studied by Fluorescence Quenching." Applied Spectroscopy 48, no. 1 (1994): 79–84. http://dx.doi.org/10.1366/0003702944027624.

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The molecule 2-acetylnaphthalene (2-AN) exhibits significant room-temperature fluorescence only in strong hydrogen-bonding solvents, such as water and fluorinated alcohols. As a consequence, the fluorescence of 2-AN is strongly quenched when it binds in the relatively nonpolar cavity of cyclodextrins (CDs). Fluorescence lifetime data confirm that the quenching is static rather than dynamic, and thus the slope of the Stern-Volmer quenching plot (F°/F vs . [CD]) is equal to K, the binding constant. We have used these plots to measure K for 1:1 complexes formed between 2-AN and several CDs, inclu

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Melavanki, R. M., N. R. Patil, D. Nagaraja, H. D. Patil, J. S. Kadadevarmath, and R. A. Kusanur. "Solvent Effect on Fluorescence Quenching of 7, 8 Benzo‑4‑azido Methyl Coumarin by Aniline." Mapana - Journal of Sciences 12, no. 1 (2013): 69–85. http://dx.doi.org/10.12723/mjs.24.7.

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Fluorescence quenching of biologically active studies of 7, 8 benzo-4-azidomethyl coumarin (7BAMC) by aniline in four different organic solvents namely benzene, dioxane, tetrahydrofuran and acetonitrile has been carried out at room temperature with a view to understand the quenching mechanisms. The Stern–Volmer (S-V) plot has been found to be non-linear with a positive deviation for all the solvents studied. In order to interpret these results we have invoked the ground state complex formation and sphere of action static quenching models. Using these models various quenching rate parameters ha

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Verma, Awadhesh Kumar, and Z. A. Ansari. "Fluorescent ZnO Quantum Dot Probe to Study Glucose–Glucose Oxidase Interaction via Fluorescence Resonance Energy Transfer." Sensor Letters 18, no. 5 (2020): 351–65. http://dx.doi.org/10.1166/sl.2020.4232.

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In this work, emphasis is to utilize FRET method to analyze GOx and glucose interaction using fluorescent ZnO QDs as the probes. Fluorescent ZnO and ZnOext QDs were synthesized using sol– gel technique and green synthesis method as donor and acceptor nanoprobes. Structural, optical and morphological characterization of QDS were carried out using UV-visible absorption, fluorescence, FTIR, XRD and field emission scanning electron microscopy. Band gap estimated from Tauc plot is 3.49 and 3.35 eV for ZnO and ZnOext QDs and XRD reveal Wurtzite structure of grown crystals. Systematic absorption stud

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Raj, Vidya, and Sreenivasan Kunnetheeri. "Nonconjugated Polyelectrolyte as Efficient Fluorescence Quencher and Their Applications as Biosensors: Polymer-Polymer Interaction." ISRN Analytical Chemistry 2014 (January 22, 2014): 1–8. http://dx.doi.org/10.1155/2014/841857.

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A simple fluorescence quenching method for the quantitation in serum of an acute phase reactant, C-reactive protein (CRP), which can differentiate between viral and bacterial infections, is described, where material and reagent costs are minimal. The study harnesses a fluorescence quenching between a nonfluorescent polyelectrolyte containing a ligand (O-phosphorylethanolamine, PEA) and fluorophore (fluorescamine isomer 1) containing polyelectrolyte. The quenching was attributed due to strong polymer-polymer interaction through intermolecular hydrogen bonding. The nonlinear behaviour of Stern-V

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Bal, Mustafa, and Ayşegül Köse. "Polycyclic aromatic‐based fluorescent probes: Color properties and fluorimetric detection of nitroaromatic explosives." Vietnam Journal of Chemistry 61, no. 5 (2023): 621–31. http://dx.doi.org/10.1002/vjch.202300114.

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AbstractDetection of nitroaromatic explosives (NAEs) is very important in terms of national security as well as the damage they cause to living things and the environment. The precision detection of these is a very important issue to reduce their harmful effects and take the necessary precautions. Electron‐rich polyaromatic fluorescent materials are highly sensitive and selective in the detection of NAEs in terms of their fluorometric quenching abilities. Three imine compounds (A‐C) containing pyrene, anthracene or naphthalene moieties were prepared and used as fluorescent probes for fluoresce

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Phuong Ho, Dat Phat Nguyen, Khoi Dinh Dang, and Hao Minh Hoang. "Comparison of Quenching Kinetics and Mechanism of Tryptophan by Acrylamide and Genistein Studied by Fluorescence Spectroscopy." Journal of Technical Education Science 20, no. 02 (2025): 20–25. https://doi.org/10.54644/jte.2025.1568.

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Fluorescence quenching using acrylamide and genistein as quenchers has been used to investigate the quenching kinetics and mechanism of tryptophan (Trp) monomer. Fluorescence quenching experiments of Trp by acrylamide were revised as references in present work. The in vitro inhibitory potential against α-glucosidase of genistein has been reported in previous literature, suggesting that the contacts of Trp residue of enzyme and genistein are responsible for the inhibitory activity of genistein. Therefore, genistein was selected as a quencher to symmetrically investigate the quenching kinetics a

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35

Khairy, Gasser M., Zaitona A. Abd El-Naby, Alaa M. A. Elgindy, Axel Duerkop, and Eman A. Abdel Hameed. "Sensitive Determination of Moxifloxacin HCl in Pharmaceuticals or Human Plasma Using Luminescence or Eye Vision." Chemosensors 10, no. 10 (2022): 378. http://dx.doi.org/10.3390/chemosensors10100378.

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A new probe based on the complex of 1,2 dihydro-2-oxoquinoloine-4-carboxylic acid (DOCA) as a ligand with Europium (III) ion was developed for the quantitation of Moxifloxacin HCl (Moxi.HCl) in pharmaceuticals and human plasma using a luminescence method. The metal to ligand ratio of the complex is 1:2 as determined by a Job plot. The determination of Moxi.HCl is based on static quenching of the luminescence of the probe upon coordination of Moxi.HCl. The negative value for ΔG proves that this reaction is spontaneous. The calibration curve was constructed based on a Stern–Volmer equation and t

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Kuzmič, Petr, and Milan Souček. "Substituent effects in aromatic photochemistry. UV irradiation of 3,4-dimethoxybenzonitrile and 3,4-dimethoxyacetophenone in the presence of inorganic anions." Collection of Czechoslovak Chemical Communications 52, no. 4 (1987): 980–88. http://dx.doi.org/10.1135/cccc19870980.

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Ultraviolet photolysis of 3,4-dimethoxybenzonitrile (Ia) and 3,4-dimethoxyacetophenone (IIa) in the presence of the hydroxide or cyanide anion leads to nucleophilic displacement of either the para or the meta methoxy substituent. The ratio of isomeric photoproducts is dependent upon the nature of the nucleophile. Photoreactions with the OH- anion lead exclusively to the substitution at C-3. On the other hand, both isomers are formed when acetophenone IIa is irradiated in the presence of CN-, with the C-3/C-4 substitution ratio 3:2. In the case of the photocyanation of Ia, the C-4 substituted p

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Rizk, Moustafa A., Mabkhoot A. Alsaiari, Raiedhah A. Alsaiari, Ibrahim A. Ibrahim, Abbas M. Abbas, and Gasser M. Khairy. "New Terbium Complex as a Luminescent Sensor for the Highly Selective Detection of Malathion in Water Samples." Chemosensors 11, no. 12 (2023): 570. http://dx.doi.org/10.3390/chemosensors11120570.

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A novel ligand, namely, (N’,N’’’-((1E,2E)-1,2-diphenylethane-1,2-diylidene)bis(3-allyl-2-hydroxybenzohydrazide) (H2DBAZ), was designed and synthesized. This ligand demonstrated the ability to successfully interact with Tb(III) ions, resulting in the formation of a chemosensor that exhibited luminescent properties. The novel ligand was produced and subsequently subjected to characterization with several analytical techniques, including mass spectroscopy, elemental analysis, Fourier-transform infrared spectroscopy (FTIR), and proton nuclear magnetic resonance spectroscopy (1H NMR). The postulate

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Ceylan, Fatma Duygu, Hilal Yılmaz, Nabil Adrar, Deniz Günal Köroğlu, Busra Gultekin Subasi, and Esra Capanoglu. "Interactions between Hazelnut (Corylus avellana L.) Protein and Phenolics and In Vitro Gastrointestinal Digestibility." Separations 9, no. 12 (2022): 406. http://dx.doi.org/10.3390/separations9120406.

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In this study, we investigated the formation of protein–phenolic complexes from dephenolized hazelnut meal protein isolates (dHPI) and hazelnut skin phenolic extracts (HSE) and their effects on the bioaccessibility of both hazelnut proteins and phenolics. The dHPI–HSE complexes were of considerable size and were dependent on HSE concentration due to aggregation. Although catechin was the main component of HSE, it did not cause aggregation, except for a slight rise in particle size. According to fluorescence quenching, the hazelnut protein–phenolic extract complex had a linear Stern–Volmer plot

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Debasis, Karak, Lohar Sisir, Sahana Animesh, et al. "Synthesis and crystallographically characterized thiadiazole derivative as an efficient Fe3+ selective fluorescent probe." Journal Of Indian Chemical Society Vol. 91, Jun 2014 (2014): 1053–63. https://doi.org/10.5281/zenodo.5722940.

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Department of Chemistry, The University of Burdwan, Burdwan-713 104, West Bengal, India <em>E-mail</em> : ddas100in@yahoo.com <em>Fax</em> : 91-342-2530452 Departamento de Química Inorgánica, Facultade de Química, Avda. Das Ciencias s/n, 15782 Santiago de Compostela, Spain <em>Manuscript received online 01 September 2013, revised 09 September 2013, accepted 02 January 2014</em> A thiadiazole derivative, 2-((napthalen-2-yl)methylthio)-5-((napthalen-7-yl)methylthio)-1,3,4 thiadiazole (L<sub>1</sub> ) has been synthesized and well characterized by different analytical techniq

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40

Chinnathambi, Shanmugavel, Subramani Karthikeyan, Devadasan Velmurugan, Nobutaka Hanagata, Prakasarao Aruna, and Singaravelu Ganesan. "Investigations on the Interactions of 5-Fluorouracil with Herring Sperm DNA: Steady State/Time Resolved and Molecular Modeling Studies." Biophysical Reviews and Letters 10, no. 02 (2015): 115–33. http://dx.doi.org/10.1142/s1793048015500034.

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In the present study, the interaction of 5-Fluorouracil with herring sperm DNA is reported using spectroscopic and molecular modeling techniques. This binding study of 5-FU with hs-DNA is of paramount importance in understanding chemico–biological interactions for drug design, pharmacy and biochemistry without altering the original structure. The challenge of the study was to find the exact binding mode of the drug 5-Fluorouracil with hs-DNA. From the absorption studies, a hyperchromic effect was observed for the herring sperm DNA in the presence of 5-Fluorouracil and a binding constant of 6.1

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Blatt, E., AWH Mau, WHF Sasse, and WH Sawyer. "Simulated Stern-Volmer Plots for 1-1 Ground-State Complexation." Australian Journal of Chemistry 41, no. 1 (1988): 127. http://dx.doi.org/10.1071/ch9880127.

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Stern-Volmer plots are simulated for the case of static quenching due to 1:1 ground-state complexation of quencher and fluorophore in solution, and compared with previously obtained experimental data. For cases where the association constant KC > 105 dm3 mol-1, upward curvatures of Stern- Volmer plots are expected. When KC is between 103 and 105 dm3 mol-1 linearity is obtained, while for KC < 103 dm3 mol-1 upward curvatures are again predicted. The significance of these results to fluorescence quenching experiments in general is discussed.

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Patil, Shivaram N., F. M. Sanningannavar, B. S. Navati, D. Nagaraja, N. R. Patil, and R. M. Melavanki. "Quenching mechanism of 5BDTC by aniline using Stern–Volmer plots." Canadian Journal of Physics 93, no. 10 (2015): 1076–81. http://dx.doi.org/10.1139/cjp-2014-0613.

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The quenching mechanism of 5,6-benzo-3-[1-(4,5-dicarbomethoxy-1,2,3-triazoloacetyl)] coumarin (5BDTC) by aniline using Stern–Volmer plots in six different solvents, namely, 1,4 dioxane, dimethyl formamide, dichloromethane, toluene, tetrahydrofuran, and acetonitrile. The Stern–Volmer plots are found to be nonlinear with a positive deviation in all six solvents. To interpret these results we have invoked ground-state complex formation and sphere of action static quenching models. Using these models, various quenching rate parameters have been determined. The magnitudes of these parameters sugges

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Camara, Fakourou, Thomas Gavaggio, Baptiste Dautreppe, et al. "Electrochemical Properties of a Rhodium(III) Mono-Terpyridyl Complex and Use as a Catalyst for Light-Driven Hydrogen Evolution in Water." Molecules 27, no. 19 (2022): 6614. http://dx.doi.org/10.3390/molecules27196614.

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Molecular hydrogen (H2) is considered one of the most promising fuels to decarbonize the industrial and transportation sectors, and its photocatalytic production from molecular catalysts is a research field that is still abounding. The search for new molecular catalysts for H2 production with simple and easily synthesized ligands is still ongoing, and the terpyridine ligand with its particular electronic and coordination properties, is a good candidate to design new catalysts meeting these requirements. Herein, we have isolated the new mono-terpyridyl rhodium complex, [RhIII(tpy)(CH3CN)Cl2](CF

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Melavanki, R. M., R. A. Kusanur, J. S. Kadadevaramath, and M. V. Kulakarni. "Quenching mechanisms of 5BAMC by aniline in different solvents using Stern–Volmer plots." Journal of Luminescence 129, no. 11 (2009): 1298–303. http://dx.doi.org/10.1016/j.jlumin.2009.06.011.

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Zeng, Hualing, and Gilles Durocher. "Analysis of fluorescence quenching in some antioxidants from non-linear Stern—Volmer plots." Journal of Luminescence 63, no. 1-2 (1995): 75–84. http://dx.doi.org/10.1016/0022-2313(94)00045-e.

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Suresh Kumar, H. M., R. S. Kunabenchi, J. S. Biradar, N. N. Math, J. S. Kadadevarmath, and S. R. Inamdar. "Analysis of fluorescence quenching of new indole derivative by aniline using Stern–Volmer plots." Journal of Luminescence 116, no. 1-2 (2006): 35–42. http://dx.doi.org/10.1016/j.jlumin.2005.02.012.

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Boßmann, Stefan, Martin Seiler, and Heinz Dürr. "Supramolecular sensitizer-relay assemblies. An evaluation of binding constants from non-linear stern-volmer plots." Journal of Physical Organic Chemistry 5, no. 2 (1992): 63–73. http://dx.doi.org/10.1002/poc.610050202.

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Keizer, Joel. "Additions and Corrections - Nonlinear Fluorescence Quenching and the Origin of Positive Curvature in Stern-Volmer Plots." Journal of the American Chemical Society 107, no. 18 (1985): 5319. http://dx.doi.org/10.1021/ja00304a601.

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Blatt, E., R. C. Chatelier, and W. H. Sawyer. "Effects of Quenching Mechanism and Type of Quencher Association on Stern-Volmer Plots in Compartmentalized Systems." Biophysical Journal 50, no. 2 (1986): 349–56. http://dx.doi.org/10.1016/s0006-3495(86)83468-3.

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Patil, N. R., R. M. Melavanki, S. B. Kapatkar, K. Chandrashekhar, H. D. Patil, and Siva Umapathy. "Fluorescence quenching of biologically active carboxamide by aniline and carbon tetrachloride in different solvents using Stern–Volmer plots." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 79, no. 5 (2011): 1985–91. http://dx.doi.org/10.1016/j.saa.2011.05.104.

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