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Rymbai LD, Klausmeyer KK, Farmer PJ. The case for an oxidopyrylium intermediate in the mechanism of quercetin dioxygenases. J Inorg Biochem 2023; 247:112343. [PMID: 37549474 DOI: 10.1016/j.jinorgbio.2023.112343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 06/22/2023] [Accepted: 07/25/2023] [Indexed: 08/09/2023]
Abstract
The quercetin dioxygenases (QDOs) are unusual metalloenzymes in that they display ring-opening dioxygenase activity with several different first-row transition metal ions which do not undergo redox changes during turnover. The QDOs are also unique in that the substrate binds as an η1-flavonolate rather than the η2 -bidentate mode seen in all reported model complexes. The flavonol substrates were early examples of excited state intramolecular proton transfer (ESIPT) phenomena, in which photoexcitation causes an H-atom exchange between the adjacent hydroxyl and ketone, generating an oxidopyrylium emissive state. These oxidopyryliums undergo ring-opening dioxygenations analogous to the enzymatic reactions. Our hypothesis is that lability of the divalent metal ion may allow access to a reactive oxidopyrylium intermediate via coordination switching from the oxy to ketone position, which allows reaction with O2. In this report, we use a straight-forward methylation strategy to generate a panel of flavonol and thioflavonol derivatives modeling several η1- and η2-coordination modes. Methylation of 3-hydroxythioflavone generates an air stable η1 hydroxopyrylium salt, which undergoes rapid ring-opening dioxygenation by deprotonation or photoexcitation. By comparison, the η1-methoxyflavonol does not react with O2 under any condition. We find that any of the studied flavonol derivatives, η1 or η2, which demonstrates ESIPT-like oxidopyrylium emissions undergo QDO-like ring-opening reactions with dioxygen. The implications of these results concerning the mechanism of QDOs and related dioxygenases is discussed.
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Affiliation(s)
- Lasien D Rymbai
- Department of Chemistry and Biochemistry, Baylor University, Waco, TX 76798, United States of America
| | - Kevin K Klausmeyer
- Department of Chemistry and Biochemistry, Baylor University, Waco, TX 76798, United States of America
| | - Patrick J Farmer
- Department of Chemistry and Biochemistry, Baylor University, Waco, TX 76798, United States of America.
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2
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James G, Walz J. Experimental and theoretical investigation of the depletion and structural forces produced by ionic micelles. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2013.09.033] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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3
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Jane YS, Shin JS. Study of Crown Ether Surfactants with Pyrene Fluorescence Probe. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.199400022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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4
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Europium Coordination Complexes as Potential Anticancer Drugs: Their Partitioning and Permeation Into Lipid Bilayers as Revealed by Pyrene Fluorescence Quenching. J Fluoresc 2012; 23:193-202. [DOI: 10.1007/s10895-012-1134-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2012] [Accepted: 10/02/2012] [Indexed: 12/19/2022]
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5
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Park BG, Pink M, Lee D. Fluorogenic N,O-chelates built on a C2-symmetric aryleneethynylene platform: Spectroscopic and structural consequences of conformational preorganization and ligand denticity. J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2011.07.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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6
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Tan SS, Kim SJ, Kool ET. Differentiating between fluorescence-quenching metal ions with polyfluorophore sensors built on a DNA backbone. J Am Chem Soc 2011; 133:2664-71. [PMID: 21294558 DOI: 10.1021/ja109561e] [Citation(s) in RCA: 110] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A common problem in detecting metal ions with fluorescentchemosensors is the emission-suppressing effects of fluorescence-quenching metal ions. This quenching tendency makes it difficult to design sensors with turn-on signal, and differentiate between several metal ions that may yield a strong quenching response. To address these challenges, we investigate a new sensor design strategy, incorporating fluorophores and metal ligands as DNA base replacements in DNA-like oligomers, for generating a broader range of responses for quenching metal ions. The modular molecular design enabled rapid synthesis and discovery of sensors from libraries on PEG-polystyrene beads. Using this approach, water-soluble sensors 1-5 were identified as strong responders to a set of eight typically quenching metal ions (Co(2+), Ni(2+), Cu(2+), Hg(2+), Pb(2+), Ag(+), Cr(3+), and Fe(3+)). They were synthesized and characterized for sensing responses in solution. Cross-screening with the full set of metal ions showed that they have a wide variety of responses, including emission enhancements and red- and blue-shifts. The diversity of sensor responses allows as few as two sensors (1 and 2) to be used together to successfully differentiate these eight metals. As a test, a set of unknown metal ion solutions in blind studies were also successfully identified based on the response pattern of the sensors. The modular nature of the sensor design strategy suggests a broadly applicable approach to finding sensors for differentiating many different cations by pattern-based recognition, simply by varying the sequence and composition of ligands and fluorophores on a DNA synthesizer.
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Affiliation(s)
- Samuel S Tan
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA
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7
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Hara Y, Saitoh T, Kasukabe H, Hiraide M. Selective Determination of Traces of Gold(III) Based on Fluorescence Quenching of Perylene in Micelles. BUNSEKI KAGAKU 2009. [DOI: 10.2116/bunsekikagaku.58.687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Yusuke Hara
- Department of Molecular Design and Engineering, Graduated School of Engineering, Nagoya University
| | - Tohru Saitoh
- Department of Molecular Design and Engineering, Graduated School of Engineering, Nagoya University
| | - Hideaki Kasukabe
- Department of Molecular Design and Engineering, Graduated School of Engineering, Nagoya University
| | - Masataka Hiraide
- Department of Molecular Design and Engineering, Graduated School of Engineering, Nagoya University
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8
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Boens N, Novikov E, Van der Auweraer M. Compartmental analysis in photophysics: Kinetics and identifiability of models for quenching of fluorescent probes in micelles. Math Biosci 2007; 209:624-43. [PMID: 17537464 DOI: 10.1016/j.mbs.2007.04.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2006] [Revised: 04/20/2007] [Accepted: 04/20/2007] [Indexed: 11/25/2022]
Abstract
The parameters describing the kinetics of excited-state processes can possibly be recovered by analysis of the fluorescence decay surface measured as a function of the experimental variables. The identifiability analysis of a photophysical model assuming errorless time-resolved fluorescence data can verify whether the model parameters can be determined. In this work, we have used the methods of similarity transformation and Taylor series to investigate the identifiability of two models utilized to describe the time-resolved fluorescence quenching of stationary probes in micelles. The first model assumes that exchange of the quencher between micelles is much slower than the fluorescence decay of the unquenched probe (the 'immobile' quencher model). The second model assumes that quenchers exchange between the aqueous and micellar phases (the 'mobile' quencher model). For the 'immobile' quencher model, the rate constants for deactivation (k(0)) and quenching (k(q)) of the excited probe are uniquely identified together with the average number of quencher molecules per micelle. For the 'mobile' quencher model, the rate constants k(0) and k(q) are uniquely identified, as are the rate constants for entry (k(+)) and exit (k(-)) of one quencher molecule into and from a micelle, and the micellar aggregation number. The concomitant rate equations describing the time-resolved fluorescence are solved using z-transforms.
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Affiliation(s)
- Noël Boens
- Department of Chemistry and Institute for Nanoscale Physics and Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200f - bus 02404, 3001 Heverlee, Belgium.
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9
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Lebedeva N, Ranganathan R, Bales BL. Location of Spectroscopic Probes in Self-Aggregating Assemblies. II. The Location of Pyrene and Other Probes in Sodium Dodecyl Sulfate Micelles. J Phys Chem B 2007; 111:5781-93. [PMID: 17488113 DOI: 10.1021/jp070540j] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The location of pyrene in sodium dodecyl sulfate (SDS) micelles is determined as a function of the aggregation number, N, by exploiting the fact that spin probes 5- and 16-doxyl stearic acid methyl esters (5DSE and 16DSE, respectively) are effective quenchers of pyrene fluorescence. The locations of the two spin probes are known from Part 1 of this series (J. Phys. Chem. B 2006, 110, 9791) and the distance between the probes and pyrene is determined by using a hydrodynamic theory to predict the quenching rate constant. The hydrodynamic theory requires the microviscosity of the regions through which the probe and pyrene diffuse. The same spin probe that serves as quencher provides a measure of the microviscosity; thus, all the information needed to locate pyrene is available from each spin probe. Employing 5DSE, at N = 53, pyrene is found to diffuse through a zone 67% of which lies within the Stern layer and 33% in the core. As the micelle grows, due to increasing either the surfactant or added-salt concentration, this diffusion zone moves outward such that, at N = 130, near the sphere-rod transition, it lies approximately 75% within the Stern layer and 25% in the core. Employing 16DSE, the location of pyrene is within 0.4 A of that found from 5DSE at low values of N and within 0.8 A at high values. Full information required to locate pyrene by using the currently developed method is not yet available for other spin probes and other commonly employed quenchers; nevertheless, using a variety of strategies and reasonable assumptions leads to the same location of pyrene within the uncertainties of the method. All of the spectroscopic probes employed in this study are largely located within the polar shell of the micelles, the largest departure being about 4% of the diameter of the micelle.
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Affiliation(s)
- Nataly Lebedeva
- Department of Physics and Astronomy and the Center for Supramolecular Studies, California State University at Northridge, Northridge, California 91330-8268, USA
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10
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Boens N, Van der Auweraer M. Identifiability of Models for Fluorescence Quenching in Aqueous Micellar Systems. Chemphyschem 2005; 6:2352-8. [PMID: 16273569 DOI: 10.1002/cphc.200500174] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The first deterministic identifiability analysis is presented for four commonly used kinetic models of fluorescence quenching of an excited probe in aqueous micelles: A) model with immobile quenchers, B) model with mobile quenchers, C) an extension of model B in which exchange of quenchers both via the aqueous phase and during micelle collisions is taken into account, and D) model with probe migration. It is shown that these specific models for fluorescence decay of an excited probe solubilized in a micelle and quenched by molecules or ions that are Poisson-distributed over the micelles, resulting in the generalized four-parameter equation f(t)=A(1) exp{-A(2)t-A(3)[1-A(4)t]}, are uniquely identifiable in terms of four descriptive A parameters. Moreover, each model also can be uniquely identified in terms of the underlying rate constants and micellar concentration or mean micellar aggregation number. This means that these parameters can be extracted in a unique way from time-resolved fluorescence quenching experiments on a probe in micelles. For each model the recommended analysis approach is given.
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Affiliation(s)
- Noël Boens
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200 F, 3001 Heverlee, Belgium.
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11
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Mukherjee TK, Mishra PP, Datta A. Photoinduced electron transfer from chlorin p6 to methyl viologen in aqueous micelles. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2005.03.055] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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12
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Zana R, Benrraou M, Bales BL. Effect of the Nature of the Counterion on the Properties of Anionic Surfactants. 3. Self-Association Behavior of Tetrabutylammonium Dodecyl Sulfate and Tetradecyl Sulfate: Clouding and Micellar Growth. J Phys Chem B 2004. [DOI: 10.1021/jp040507m] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Raoul Zana
- Institut C. Sadron (CNRS), 6 rue Boussingault, 67000 Strasbourg, France, and Department of Physics and Astronomy, California State University at Northridge, Northridge, California 91330-8268
| | - Mohamed Benrraou
- Institut C. Sadron (CNRS), 6 rue Boussingault, 67000 Strasbourg, France, and Department of Physics and Astronomy, California State University at Northridge, Northridge, California 91330-8268
| | - Barney L. Bales
- Institut C. Sadron (CNRS), 6 rue Boussingault, 67000 Strasbourg, France, and Department of Physics and Astronomy, California State University at Northridge, Northridge, California 91330-8268
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13
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Ranganathan R, Vautier-Giongo C, Bales BL. Toward a Hydrodynamic Description of Bimolecular Collisions in Micelles. An Experimental Test of the Effect of the Nature of the Quencher on the Fluorescence Quenching of Pyrene in SDS Micelles and in Bulk Liquids. J Phys Chem B 2003. [DOI: 10.1021/jp034346i] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Radha Ranganathan
- Department of Physics and Astronomy and The Center for Supramolecular Studies, California State University at Northridge, Northridge, California 91330
| | - Carolina Vautier-Giongo
- Department of Physics and Astronomy and The Center for Supramolecular Studies, California State University at Northridge, Northridge, California 91330
| | - Barney L. Bales
- Department of Physics and Astronomy and The Center for Supramolecular Studies, California State University at Northridge, Northridge, California 91330
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14
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Wagner BD, McManus GJ, Moulton B, Zaworotko MJ. Exciplex fluorescence of ([Zn(bipy)1.5(NO3)2)].CH3OH.0.5pyrene)n: a coordination polymer containing intercalated pyrene molecules (bipy = 4,4'-bipyridine). Chem Commun (Camb) 2002:2176-7. [PMID: 12362911 DOI: 10.1039/b205906a] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the first use of fluorescence spectroscopy to probe the environment of the cavities that are present in open framework coordination polymers.
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Affiliation(s)
- Brian D Wagner
- Department of Chemistry, University of Prince Edward Island, Charlottetown, PEI C1A 4P3, Canada.
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15
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Binnemans K, Görller-Walrand C. Lanthanide-containing liquid crystals and surfactants. Chem Rev 2002; 102:2303-46. [PMID: 12059269 DOI: 10.1021/cr010287y] [Citation(s) in RCA: 453] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Koen Binnemans
- Katholieke Universiteit Leuven, Department of Chemistry, Celestijnenlaan 200F, B-3001 Leuven, Belgium.
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16
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Abstract
This article presents studies on the photophysical and photochemical behavior of probes within micellar systems: organized emulsifier/polymer aggregates; the intra- and interpolymer association of amphiphilic polymers; monomer-swollen micelles (microdroplets); and the interfacial layer. Pyrene (Py) as a probe is particularly attractive because of its ability to measure the polarity of its microenvironment. Dipyme yields information on the microviscosity of micellar systems. Probes such as laurdan and prodan can be used to explore the surface characteristics of micelles or microdroplets. The dansyl group has a special photophysical property that gives information about the local polarity and mobility (viscosity) of the microenvironment. The organized association of amphiphilic polymer and emulsifier introduces a heterogeneity in the local concentration of the reactants. This heterogeneity also results from the attractive interaction between hydrophilic monomer and emulsifier in the case when the monomer carries a positive charge and the counterpart a negative one, and vice versa. Some emulsifiers can bind to the amphiphilic copolymers by simple partitioning between the aqueous phase and the polymer--non-cooperative association. The interaction between micelles (microdroplets) and charged polymers leads to the formation of mixed micelles. Binding emulsifiers to these polymers was detected at emulsifier concentrations much below the critical micellar concentration (CMC). Emulsifiers often interact cooperatively with polymers at the critical aggregation concentration (CAC) below the CMC, forming micelle-like aggregates within the polymer. The CAC can be taken as a measure of interaction between the emulsifier and polymer. A decrease in the monomer fluorescence intensity of probe-labeled polymer results from increased excimer formation, or higher aggregates within the unimolecular polymeric micelles. An increase in the monomer fluorescence intensity of probe-labeled polymer within the micellar system can be ascribed to shielding of the probe chromophores by emulsifier micelles. The quenching of probe emission by (un)charged hydrophilic monomer depends on partitioning of the monomer between the aqueous phase and the micelles. Penetration of reactants into the interfacial layer determines the quenching of the hydrophobic probe by hydrophilic quencher, or vice versa. Quenching depends on the thickness, density and charge of the interfacial layer. Compartmentalization prevents the carbonyl compound and unsaturated monomer from coming into sufficiently close contact to allow singlet or triplet-monomer interaction. All negatively charged carbonyl probe molecules are quenched with significantly lower rates than the parent neutral hydrophobic benzophenone molecules, which were located further inside the aggregates. This results from the different conformation and allocation of reactants within the micellar system. In the reverse micelles, quenching depends on the amount of water in the interfacial layer and the total area of the water/oil interface.
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Affiliation(s)
- Ignac Capek
- Polymer Institute, Slovak Academy of Sciences, Bratislava
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17
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Barzykin AV, Seki K, Tachiya M. Kinetics of diffusion-assisted reactions in microheterogeneous systems. Adv Colloid Interface Sci 2001; 89-90:47-140. [PMID: 11215811 DOI: 10.1016/s0001-8686(00)00053-1] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
This review is focused on the basic theory of diffusion-assisted reactions in microheterogeneous systems, from porous solids to self-organized colloids and biomolecules. Rich kinetic behaviors observed experimentally are explained in a unified fashion using simple concepts of competing distance and time scales of the reaction and the embedding structure. We mainly consider pseudo-first-order reactions, such as luminescence quenching, described by the Smoluchowski type of equation for the reactant pair distribution function with a sink term defined by the reaction mechanism. Microheterogeneity can affect the microscopic rate constant. It also enters the evolution equation through various spatial constraints leading to complicated boundary conditions and, possibly, to the reduction of dimensionality of the diffusion space. The reaction coordinate and diffusive motion along this coordinate are understood in a general way, depending on the problem at hand. Thus, the evolution operator can describe translational and rotational diffusion of molecules in a usual sense, it can be a discrete random walk operator when dealing with hopping of adsorbates in solids, or it can correspond to conformational fluctuations in proteins. Mathematical formulation is universal but physical consequences can be different. Understanding the principal features of reaction kinetics in microheterogeneous systems enables one to extract important structural and dynamical information about the host environments by analyzing suitably designed experiments, it helps building effective strategies for computer simulations, and ultimately opens possibilities for designing systems with controllable reactivity properties.
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Affiliation(s)
- A V Barzykin
- National Institute of Materials and Chemical Research, Tsukuba, Ibaraki, Japan.
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18
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Germanenko IN, Li S, El-Shall MS. Decay Dynamics and Quenching of Photoluminescence from Silicon Nanocrystals by Aromatic Nitro Compounds. J Phys Chem B 2000. [DOI: 10.1021/jp002340c] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Igor N. Germanenko
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006
| | - Shoutian Li
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006
| | - M. Samy El-Shall
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006
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19
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Kanthimathi M, Deepa K, Nair BU, Mandal AB. Fluorescence Quenching of Pyrene by Chromium Complexes in Sodium Dodecyl Sulfate Micelles. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2000. [DOI: 10.1246/bcsj.73.1769] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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20
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Affiliation(s)
- Anna K. Mathew
- Institute for Polymer Research, Department of Chemistry, University of Waterloo, Waterloo, ON N2J 3G1, Canada
| | - Howard Siu
- Institute for Polymer Research, Department of Chemistry, University of Waterloo, Waterloo, ON N2J 3G1, Canada
| | - Jean Duhamel
- Institute for Polymer Research, Department of Chemistry, University of Waterloo, Waterloo, ON N2J 3G1, Canada
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21
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Vangani V, Duhamel J, Nemeth S, Jao TC. Study of a Polymeric Network by Dynamic Fluorescence Quenching Using a Blob Model. Macromolecules 1999. [DOI: 10.1021/ma981129k] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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22
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KUZMIN MG, SOBOLEVA IV, KOTOV NA. Kinetics of Photoinduced Charge Transfer at Microscopic and Macroscopic Interfaces. ANAL SCI 1999. [DOI: 10.2116/analsci.15.3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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23
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Guan JQ, Tung CH. Dynamics of Fluorescence Quenching of Pyrene in Novel Micelles of the Zwitterionic Betaine Surfactant N-(3-Dodecyloxy-2-hydroxypropyl)-N,N-dimethylglycine. J Colloid Interface Sci 1998; 208:90-95. [PMID: 9820752 DOI: 10.1006/jcis.1998.5754] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Time-resolved and steady-state fluorescence have been employed to study the fluorescence quenching of pyrene, solubilized in novel micelles of the zwitterionic surfactant, N-(3-dodecyloxy-2-hydroxy propyl)-N,N-dimethylglycine (DHDG), by iodide ions in aqueous solution. The fluorescence quenching rate constants (kq), micellar exit rate constants (k-), and micellar aggregation numbers (N) have been determined in each case. Generally the fluorescence quenching rates in micellar solutions with pH values above the isoelectric point (pH 5.1) (zwitterionic) of DHDG are lower than when pH is below 5.1 (cationic). Addition of NaCl results in a moderate variation of the micellar aggregation numbers and a subsequent change in kq. When cationic and zwitterionic DHDG micelles have the same micelle aggregation number, kq in the cationic DHDG micelles is higher, suggesting that both the aggregation number and the micellar surface potential related to the charge of head groups influence kq. The dynamics of iodide ion exit from DHDG micelles has also been studied. The exit rate constants of iodide ion from micelles, k-, is independent of micelle concentration (in the range studied), but is dependent on micellar aggregation number and is related to micellar interfacial potential. The steady-state and time-resolved fluorescence measurements agree very well, suggesting the importance of dynamic fluorescence quenching processes. Copyright 1998 Academic Press.
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Affiliation(s)
- JQ Guan
- Institute of Photographic Chemistry, Chinese Academy of Sciences, Beijing, 100101, China
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24
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Winnik FM, Regismond ST. Fluorescence methods in the study of the interactions of surfactants with polymers. Colloids Surf A Physicochem Eng Asp 1996. [DOI: 10.1016/0927-7757(96)03733-8] [Citation(s) in RCA: 305] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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25
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Affiliation(s)
- C. Ju
- Department of Chemistry, University of Victoria, P.O. Box 3055, Victoria, B.C., Canada V8W 3P6
| | - C. Bohne
- Department of Chemistry, University of Victoria, P.O. Box 3055, Victoria, B.C., Canada V8W 3P6
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26
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Juskowiak B. Efficient quenching of the fluorescence of binaphthyl-based amphiphiles by mercury(II) complexes. Anal Chim Acta 1996. [DOI: 10.1016/0003-2670(95)00511-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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27
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Kuzmin MG, Soboleva IV. Effect of solubilization in micelles on the kinetics of electron transfer photoreactions and redox properties of reactants. Quenching of RuL62+ luminescence in SDS micelles. J Photochem Photobiol A Chem 1995. [DOI: 10.1016/1010-6030(94)03963-u] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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28
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Internal magnetic field effect of transition metal ions on the photochemical reaction of naphthoquinone in micelles. Chem Phys 1992. [DOI: 10.1016/0301-0104(92)80225-k] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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Barzykin A. Statistical mechanical treatment of a compartmentalized molecular ensemble. Application to electronic energy transfer in micellar systems. Chem Phys 1992. [DOI: 10.1016/0301-0104(92)80177-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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30
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Barzykin A. Stochastic treatment of fluorescence quenching in monodisperse micellar systems with exchange of probes and quenchers. Chem Phys Lett 1992. [DOI: 10.1016/0009-2614(92)85209-s] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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