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Reaction engineering with recurrent neural network: Kinetic study of Dushman reaction. CHEMICAL ENGINEERING JOURNAL ADVANCES 2022. [DOI: 10.1016/j.ceja.2021.100219] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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2
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Pires RO, Faria RB. The Photochemical Chlorate-Iodide Clock Reaction. Inorg Chem 2021; 61:1178-1187. [PMID: 34965359 DOI: 10.1021/acs.inorgchem.1c03522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Mixing iodide and perchloric acid solutions with an excess of chlorate inside a diode-array spectrophotometer led to the observation of an abrupt decrease of the absorbance at the 215 nm isosbestic point after an induction period. The clock time decreases by increasing the initial concentrations of chlorate and acid, but increasing the initial iodide concentration has an opposite effect. The proposed mechanism simulates the experimental results and considers the interaction of UV light with iodide, producing iodine and triiodide ion. The autocatalytic core of this mechanism is the same as that employed to explain the autocatalytic behavior of chlorine dioxide-iodine reaction, but considering H2IO+ as the reactive species rather than HOI, being a more realistic mechanism for acid conditions.
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Affiliation(s)
- Romulo O Pires
- Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-909 Rio de Janeiro, Brazil
| | - Roberto B Faria
- Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-909 Rio de Janeiro, Brazil
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Guichardon P, Baqueiro C, Ibaseta N. Villermaux–Dushman Test of Micromixing Characterization Revisited: Kinetic Effects of Acid Choice and Ionic Strength. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c03208] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Pierrette Guichardon
- Aix Marseille Univ, CNRS, Centrale Marseille, M2P2, 13013 Marseille, France
- Ecole Centrale Marseille, M2P2, 38, rue Frédéric Joliot-Curie, 13451 Marseille, France
| | - Carlos Baqueiro
- Aix Marseille Univ, CNRS, Centrale Marseille, M2P2, 13013 Marseille, France
- Ecole Centrale Marseille, M2P2, 38, rue Frédéric Joliot-Curie, 13451 Marseille, France
| | - Nelson Ibaseta
- Aix Marseille Univ, CNRS, Centrale Marseille, M2P2, 13013 Marseille, France
- Ecole Centrale Marseille, M2P2, 38, rue Frédéric Joliot-Curie, 13451 Marseille, France
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Rabani J, Mamane H, Pousty D, Bolton JR. Practical Chemical Actinometry-A Review. Photochem Photobiol 2021; 97:873-902. [PMID: 34124787 DOI: 10.1111/php.13429] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 04/05/2021] [Indexed: 01/03/2023]
Abstract
Actinometers are physical or chemical systems that can be employed to determine photon fluxes. Chemical actinometers are photochemical systems with known quantum yields that can be employed to determine accurate photon fluxes for specific photochemical reactions. This review explores in detail several practical chemical actinometers (ferrioxalate, iodide-iodate, uranyl oxalate, nitrate, uridine, hydrogen peroxide and several actinometers for the vacuum ultraviolet). Each actinometer is described with recommended conditions for its use.
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Affiliation(s)
- Joseph Rabani
- The Accelerator Laboratory, Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Hadas Mamane
- School of Mechanical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv, Israel
| | - Dana Pousty
- School of Mechanical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv, Israel
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Csekö G, Gao Q, Xu L, Horváth AK. Autocatalysis-Driven Clock Reaction III: Clarifying the Kinetics and Mechanism of the Thiourea Dioxide-Iodate Reaction in an Acidic Medium. J Phys Chem A 2019; 123:1740-1748. [PMID: 30742444 DOI: 10.1021/acs.jpca.9b00584] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The thiourea dioxide-iodate reaction has been reinvestigated spectrophotometrically under acidic conditions using phosphoric acid-dihydrogen phosphate buffer within the pH range of 1.1-1.8 at 1.0 M ionic strength adjusted by sodium perchlorate and at 25 °C. The system was found to exhibit clock behavior, having a well-defined and reproducible time lag called Landolt time, though elementary iodine may even be detected in substrate excess; hence, under these conditions, the reaction can be classified as an autocatalysis-driven clock reaction. It is clearly demonstrated that the previously proposed kinetic model suffers from serious drawbacks from both theoretical and experimental points of view. The reaction may be characterized by either sigmoidal-shaped or rise-and-fall kinetic traces, depending on the initial concentration ratio of the reactants. Iodide significantly accelerates the appearance of the clock species iodine acting therefore as an autocatalyst. The age of stock TDO solution also has a great, so far completely overlooked impact on the Landolt time. On the basis of evaluating simultaneously the kinetic curves, a 16 step kinetic model including 5 well-known rapidly established equilibria is proposed with 7 fitted rate coefficients in which the rate coefficients of both forms of TDO were determined.
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Affiliation(s)
- György Csekö
- College of Chemical Engineering , China University of Mining and Technology , Xuzhou 221116 , People's Republic of China.,Department of Inorganic Chemistry, Faculty of Sciences , University of Pécs , Ifjúság u. 6 , Pécs , Hungary H-7624
| | - Qingyu Gao
- College of Chemical Engineering , China University of Mining and Technology , Xuzhou 221116 , People's Republic of China
| | - Li Xu
- Department of Chemical Engineering and Technology, School of Chemistry, Biology and Material of Science , East China University of Technology , Nanchang 330013 , Jiangxi Province People's Republic of China
| | - Attila K Horváth
- Department of Inorganic Chemistry, Faculty of Sciences , University of Pécs , Ifjúság u. 6 , Pécs , Hungary H-7624
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Frerichs GA, Jones J, Huang X, Gebrekidan M, Burch J, Cheng MY, Chen Y. Batch pH Oscillations in the Belousov-Zhabotinsky Reaction. J Phys Chem A 2019; 123:1303-1310. [PMID: 30672706 DOI: 10.1021/acs.jpca.8b11222] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
No single-phase system has been previously reported to give significant pH oscillations in a closed (batch) reactor. We report here sustained pH oscillations in batch for the Belousov-Zhabotinsky reaction using much lower [H+]0 and much higher [BrO3-]0 than in traditional studies of this reaction. In fact, pH oscillations were obtained in the presence of only BrO3-, malonic acid (MA), and Mn2+. The amplitude, frequency, and duration of oscillations tend to depend primarily on the ratio of [BrO3-]0 to [MA]0. A critical part of the proposed mechanism involves the reversible formation of a manganese(III) complex with bromomalonic acid, followed by two-electron oxidation to tartraric acid and Mn2+. Estimates of the corresponding rate constant values for these reactions have been obtained by simulation. It is suggested that the presence of a supercatalytic reaction in H+ may be a sufficient, if not necessary, requirement for the occurrence of pH oscillations in a batch system.
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Affiliation(s)
- Glen A Frerichs
- Department of Chemistry , Westminster College , 501 Westminster Avenue , Fulton , Missouri 65251 , United States
| | - James Jones
- Department of Chemistry , Westminster College , 501 Westminster Avenue , Fulton , Missouri 65251 , United States
| | - Xiaohe Huang
- Department of Chemistry , Westminster College , 501 Westminster Avenue , Fulton , Missouri 65251 , United States
| | - Mulurhab Gebrekidan
- Department of Chemistry , Westminster College , 501 Westminster Avenue , Fulton , Missouri 65251 , United States
| | - Jacob Burch
- Department of Chemistry , Westminster College , 501 Westminster Avenue , Fulton , Missouri 65251 , United States
| | - Mei Yuan Cheng
- Department of Chemistry , Westminster College , 501 Westminster Avenue , Fulton , Missouri 65251 , United States
| | - Yuwei Chen
- Department of Chemistry , Westminster College , 501 Westminster Avenue , Fulton , Missouri 65251 , United States
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8
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Pure gold dissolution in dilute chloric, bromic or iodic acid solution containing abundant halide ions. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2016.12.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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9
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Horváth V, Epstein IR, Kustin K. Mechanism of the Ferrocyanide-Iodate-Sulfite Oscillatory Chemical Reaction. J Phys Chem A 2016; 120:1951-60. [PMID: 26949219 DOI: 10.1021/acs.jpca.5b11152] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Existing models of the ferrocyanide-iodate-sulfite (FIS) reaction seek to replicate the oscillatory pH behavior that occurs in open systems. These models exhibit significant differences in the amplitudes and waveforms of the concentration oscillations of such intermediates as I(-), I3(-), and Fe(CN)6(3-) under identical conditions and do not include several experimentally found intermediates. Here we report measurements of sulfite concentrations during an oscillatory cycle. Knowing the correct concentration of sulfite over the course of a period is important because sulfite is the main component that determines the buffer capacity, the pH extrema, and the amount of oxidizer (iodate) required for the transition to low pH. On the basis of this new result and recent experimental findings on the rate laws and intermediates of component processes taken from the literature, we propose a mass action kinetics model that attempts to faithfully represent the chemistry of the FIS reaction. This new comprehensive mechanism reproduces the pH oscillations and the periodic behavior in [Fe(CN)6(3-)], [I3(-)], [I(-)], and [SO3(2-)]T with characteristics similar to those seen in experiments in both CSTR and semibatch arrangements. The parameter ranges at which stationary and oscillatory behavior is exhibited also show good agreement with those of the experiments.
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Affiliation(s)
- Viktor Horváth
- Department of Chemistry, Brandeis University , Waltham, Massachusetts 02454-9110, United States
| | - Irving R Epstein
- Department of Chemistry, Brandeis University , Waltham, Massachusetts 02454-9110, United States
| | - Kenneth Kustin
- Department of Chemistry, Brandeis University , Waltham, Massachusetts 02454-9110, United States
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Valkai L, Horváth AK. Compatible Mechanism for a Simultaneous Description of the Roebuck, Dushman, and Iodate–Arsenous Acid Reactions in an Acidic Medium. Inorg Chem 2016; 55:1595-603. [DOI: 10.1021/acs.inorgchem.5b02513] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- László Valkai
- Department of Inorganic Chemistry, University of Pécs, Ifjúság
útja 6, H-7624 Pécs, Hungary
| | - Attila K. Horváth
- Department of Inorganic Chemistry, University of Pécs, Ifjúság
útja 6, H-7624 Pécs, Hungary
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Csekő G, Valkai L, Horváth AK. A Simple Kinetic Model for Description of the Iodate–Arsenous Acid Reaction: Experimental Evidence of the Direct Reaction. J Phys Chem A 2015; 119:11053-8. [DOI: 10.1021/acs.jpca.5b08011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- György Csekő
- Department of Inorganic Chemistry, University of Pécs, Ifjúság útja 6., H-7624 Pécs, Hungary
| | - László Valkai
- Department of Inorganic Chemistry, University of Pécs, Ifjúság útja 6., H-7624 Pécs, Hungary
| | - Attila K. Horváth
- Department of Inorganic Chemistry, University of Pécs, Ifjúság útja 6., H-7624 Pécs, Hungary
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Xu L, Horváth AK. A Possible Candidate to Be Classified as an Autocatalysis-Driven Clock Reaction: Kinetics of the Pentathionate–Iodate Reaction. J Phys Chem A 2014; 118:6171-80. [DOI: 10.1021/jp5057573] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Li Xu
- Department of Inorganic Chemistry, University of Pécs, Ifjúság
útja 6, Pécs, H-7624 Hungary
| | - Attila K. Horváth
- Department of Inorganic Chemistry, University of Pécs, Ifjúság
útja 6, Pécs, H-7624 Hungary
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Pejić ND, Blagojević SM, Sarap NB, Maksimović JP, Anić SR, Čupić ŽD, Kolar-Anić LZ. Perturbations of the DushmanReaction with Piroxicam: Experimental and Model Calculations. Helv Chim Acta 2014. [DOI: 10.1002/hlca.201300109] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Terent'ev AO, Zdvizhkov AT, Kulakova AN, Novikov RA, Arzumanyan AV, Nikishin GI. Reactions of mono- and bicyclic enol ethers with the I2–hydroperoxide system. RSC Adv 2014. [DOI: 10.1039/c3ra46462h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Reactions of mono- and bicyclic enol ethers with I2–H2O2, I2–ButOOH, and I2–tetrahydropyranyl hydroperoxide systems possessing unique and unpredictable reactivity have been studied.
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Affiliation(s)
- Alexander O. Terent'ev
- N. D. Zelinsky Institute of Organic Chemistry
- Russian Academy of Sciences
- Moscow, Russian Federation
| | - Alexander T. Zdvizhkov
- N. D. Zelinsky Institute of Organic Chemistry
- Russian Academy of Sciences
- Moscow, Russian Federation
| | - Alena N. Kulakova
- N. D. Zelinsky Institute of Organic Chemistry
- Russian Academy of Sciences
- Moscow, Russian Federation
| | - Roman A. Novikov
- N. D. Zelinsky Institute of Organic Chemistry
- Russian Academy of Sciences
- Moscow, Russian Federation
| | - Ashot V. Arzumanyan
- N. D. Zelinsky Institute of Organic Chemistry
- Russian Academy of Sciences
- Moscow, Russian Federation
| | - Gennady I. Nikishin
- N. D. Zelinsky Institute of Organic Chemistry
- Russian Academy of Sciences
- Moscow, Russian Federation
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Schmitz G. Iodine oxidation by hydrogen peroxide and Bray–Liebhafsky oscillating reaction: effect of the temperature. Phys Chem Chem Phys 2011; 13:7102-11. [DOI: 10.1039/c1cp00006c] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Schmitz G. Iodine oxidation by hydrogen peroxide in acidic solutions, Bray-Liebhafsky reaction and other related reactions. Phys Chem Chem Phys 2010; 12:6605-15. [DOI: 10.1039/b927432d] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Chikwana E, Davis B, Morakinyo MK, Simoyi RH. Oxyhalogen–sulfur chemistry — Kinetics and mechanism of oxidation of methionine by aqueous iodine and acidified iodate. CAN J CHEM 2009. [DOI: 10.1139/v09-038] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The oxidation of methionine (Met) by acidic iodate and aqueous iodine was studied. Though the reaction is a simple two-electron oxidation to give methionine sulfoxide (Met–S=O), the dynamics of the reaction are, however, very complex, characterized by clock reaction characteristics and transient formation of iodine. In excess methionine conditions, the stoichiometry of the reaction was deduced to be IO3– + 3Met → I– + 3Met–S=O. In excess iodate, the iodide product reacts with iodate to give a final product of molecular iodine and a 2:5 stoichiometry: 2IO3– + 5Met + 2H+→ I2 + 5Met–S=O + H2O. The direct reaction of iodine and methionine is slow and mildly autoinhibitory, which explains the transient formation of iodine, even in conditions of excess methionine in which iodine is not a final product. The whole reaction scheme could be simulated by a simple network of 11 reactions.
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Affiliation(s)
- Edward Chikwana
- Department of Chemistry, Portland State University, Portland, OR 97207-0751, USA
| | - Bradley Davis
- Department of Chemistry, Portland State University, Portland, OR 97207-0751, USA
| | - Moshood K. Morakinyo
- Department of Chemistry, Portland State University, Portland, OR 97207-0751, USA
| | - Reuben H. Simoyi
- Department of Chemistry, Portland State University, Portland, OR 97207-0751, USA
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Schmitz G. Inorganic reactions of iodine(III) in acidic solutions and free energy of iodous acid formation. INT J CHEM KINET 2008. [DOI: 10.1002/kin.20344] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Côrtes CES, Faria RB. Kinetics and Mechanism of Bromate−Bromide Reaction Catalyzed by Acetate. Inorg Chem 2004; 43:1395-402. [PMID: 14966975 DOI: 10.1021/ic0350786] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The initial rate of the bromate-bromide reaction, BrO3- + 5Br- + 6H+ --> 3Br2 + 3H2O, has been measured at constant ionic strength, I = 3.0 mol L(-1), and at several initial concentrations of acetate, bromate, bromide, and perchloric acid. The reaction was followed at the Br2/Br3- isosbestic point (lambda = 446 nm) by the stopped-flow technique. A very complex behavior was found such that the results could be fitted only by a six term rate law, nu = k1[BrO3-][Br-][H+]2 + k2[BrO3-][Br-]2[H+]2 + k3[BrO3-][H+]2[acetate]2 + k4[BrO3-][Br-]2[H+]2[acetate] + k5[BrO3-][Br-][H+]3[acetate]2 + k6[BrO3-][Br-][H+]2[acetate], where k1 = 4.12 L3 mol(-3) s(-1), k2 = 0.810 L4 mol(-4) s(-1), k3 = 2.80 x 10(3) L4 mol(-4) s(-1), k4 = 278 L5 mol(-5) s(-1), k5 = 5.45 x 10(7) L6 mol(-6) s(-1), and k6 = 850 L4 mol(-4) s(-1). A mechanism, based on elementary steps, is proposed to explain each term of the rate law. This mechanism considers that when acetate binds to bromate it facilitates its second protonation.
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Affiliation(s)
- Carlos Eduardo S Côrtes
- Departamento de Química Geral e Inorgânica, Instituto de Química, Universidade Federal Fluminense, Morro do Valonguinho s/n, 24210-150 Niterói, RJ, Brazil
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Chikwana E, Simoyi RH. Oxyhalogen−Sulfur Chemistry: Kinetics and Mechanism of Oxidation of Amidinothiourea by Acidified Iodate. J Phys Chem A 2004. [DOI: 10.1021/jp0367068] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Edward Chikwana
- Department of Chemistry, Portland State University, Portland, Oregon 97207-0751
| | - Reuben H. Simoyi
- Department of Chemistry, Portland State University, Portland, Oregon 97207-0751
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Furrow SD, Cervellati R, Amadori G. New Substrates for the Oscillating Briggs−Rauscher Reaction. J Phys Chem A 2002. [DOI: 10.1021/jp0138779] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Stanley D. Furrow
- Department of Chemistry, Berks-Lehigh Valley College, Pennsylvania State University, Reading, Pennsylvania 19610-6009, and Dipartimento di Chimica G. Ciamician, Università di Bologna, via Selmi 2, 40126 Bologna
| | - Rinaldo Cervellati
- Department of Chemistry, Berks-Lehigh Valley College, Pennsylvania State University, Reading, Pennsylvania 19610-6009, and Dipartimento di Chimica G. Ciamician, Università di Bologna, via Selmi 2, 40126 Bologna
| | - Giovanna Amadori
- Department of Chemistry, Berks-Lehigh Valley College, Pennsylvania State University, Reading, Pennsylvania 19610-6009, and Dipartimento di Chimica G. Ciamician, Università di Bologna, via Selmi 2, 40126 Bologna
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