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Journal articles on the topic 'O-redox'

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Published: 7 July 2024

Last updated: 7 July 2024

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1

Molina Portela, Maria P., Silvia H. Fernandez Villamil, Luis J. Perissinotti, and Andres O. M. Stoppani. "Redox cycling of o-naphthoquinones in yrypanosomatids." Biochemical Pharmacology 52, no. 12 (December 1996): 1875–82. http://dx.doi.org/10.1016/s0006-2952(96)00601-6.

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2

Spasojević, Ivan, Stefan I. Liochev, and Irwin Fridovich. "Lucigenin: Redox Potential in Aqueous Media and Redox Cycling with O−2 Production1." Archives of Biochemistry and Biophysics 373, no. 2 (January 2000): 447–50. http://dx.doi.org/10.1006/abbi.1999.1579.

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3

Huang, Tzu-Yang, and Bryan D. McCloskey. "Separating O-Redox and Mn-Redox Voltage Hysteresis in a Cation-Disordered Rock-Salt Cathode." ECS Meeting Abstracts MA2023-01, no. 2 (August 28, 2023): 491. http://dx.doi.org/10.1149/ma2023-012491mtgabs.

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Pronounced voltage hysteresis is commonly associated with oxygen redox in Li-excess cathode materials. However, they often involve coexisting transition-metal and oxygen redox, whose contributions to hysteresis are challenging to distinguish. In this work, a two-step aqueous redox titration was developed with the aid of mass spectrometry (MS) gas analyzer to quantify two coexisting solid-phase analytes, namely oxidized oxygen and Mn3+/4+ in a representative Li-excess cation-disordered rock salt (DRX) material. Two MS-countable gas molecules evolve from two separate titrant-analyte reactions, which allows decoupling Mn and O redox capacities. As incremental redox capacities are quantitatively decoupled, each redox voltage hysteresis can be further evaluated through deconvoluted energy efficiency and overvoltages. Overall, a low DRX operating efficiency arises not only from quasi-static voltage hysteresis of O redox, but also from asymmetric Mn-redox overvoltages. The results reveal that O redox is not always the only culprit for a low energy efficiency and slow kinetics, but instead discharging overvoltage, associated with transition-metal redox, can significantly drag down overall operating efficiency. This work further shows the potential of designing new analytical workflow to experimentally diagnose various DRX materials and inform improvement direction.

4

Eisenstecken, Daniela, Barbara Enk, Holger Kopacka, Klaus Wurst, Thomas Müller, Florian Pevny, Rainer F. Winter, and Benno Bildstein. "Redox-Responsive Rhodocenium [O,O]-, [N,O]-, [N,N]-, and [N,C,N]-Metalloligands." European Journal of Inorganic Chemistry 2011, no. 19 (May 25, 2011): 2958–66. http://dx.doi.org/10.1002/ejic.201100226.

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5

Palys, Barbara, Agnieszka Bokun, and Jerzy Rogalski. "Poly-o-phenylenediamine as redox mediator for laccase." Electrochimica Acta 52, no. 24 (August 2007): 7075–82. http://dx.doi.org/10.1016/j.electacta.2007.05.029.

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6

Shen, Xiaoxiao, Shuaishuai Zhang, Yuping Wu, and Yuhui Chen. "Promoting Li–O 2 Batteries With Redox Mediators." ChemSusChem 12, no. 1 (January 9, 2019): 104–14. http://dx.doi.org/10.1002/cssc.201802007.

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7

Jadhav, Rohit G., and Shelley D. Minteer. "Conjugated Bipolar Redox-Active Electrolyte for Symmetric Redox Flow Battery." ECS Meeting Abstracts MA2022-02, no. 46 (October 9, 2022): 1705. http://dx.doi.org/10.1149/ma2022-02461705mtgabs.

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Organic non-aqueous redox-flow batteries (O-NRFBs) are gaining traction as viable alternatives for long-term, low-cost stationary energy storage with a wide potential window.[1] The symmetric O-NRFBs with single bipolar electrochemically active molecule as both anolyte and catholyte (i.e. bipolar redoxmer) helps to mitigate permanent cross-contamination and capacity fading.[2] However, symmetric O-NRFBs with bipolar molecules are hampered by the scarcity of redox active molecules capable of serving as a stable bipolar redoxmer with high cell potential and unpredictable side reactions.[3] This study proposes the π-conjugation of electrochemical active electron donors and electron acceptor which leads to the possible control over direct electronic perturbation between acceptor-donor to form new type of redox molecules. This study aims designing of benzothiadiazole based conjugated bipolar redox-active molecule with high potential window and high stability. [1]. M. Li, S. A. Odom, A. R. Pancoast, L. A. Robertson, T. P. Vaid, G. Agarwal, H. A. Doan, Y. Wang, T. M. Suduwella, S. R. Bheemireddy, R. H. Ewoldt, R. S. Assary, L. Zhang, M. S. Sigman, and S. D. Minteer, “Experimental protocols for studying organic non-aqueous redox flow batteries,” ACS Energy Lett., 2021, 6, 11, 3932–3943. [2]. M. Li, J. Case, and S. D. Minteer, “Bipolar redox-active molecules in non-aqueous organic redox flow batteries: status and challenges,” ChemElectroChem, 2021, 8, 1215–123. [3] M. Li, G. Agarwal, I. A. Shkrob, R. T. VanderLinden, J. Case, M. Prater, Z. Rhodes, R. S. Assary and S. D. Minteer, “Critical role of structural order in bipolar redox-active molecules for organic redox flow batteries,” J. Mater. Chem. A, 2021, 9, 23563-23573.

8

Andrade, João Carlos de. "Química analítica básica." Revista Chemkeys 3 (August 5, 2021): e021002. http://dx.doi.org/10.20396/chemkeys.v3i00.15815.

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As titulações redox são procedimentos analíticos relativamente simples, rápidos e de baixo custo, empregados na determinação de espécies redox ativas. Analogamente aos casos envolvendo sistemas ácido-base, onde o curso de uma titulação pode ser seguido por meio de uma curva pH versus o volume do titulante (V), uma titulação envolvendo uma reação redox pode ser monitorada observando-se a curva Potencial (ε) versus o volume do titulante (V), desde que o sistema redox a ser empregado preencha todos os requisitos necessários para que uma reação química possa ser considerada como adequada para uso em uma titulação. Uma vez atendidos esses requisitos e a partir das suas semirreações, é possível descrever uma titulação redox com equações matemáticas e construir sua curva de titulação teórica, tal qual foi feito anteriormente para sistemas não-redox. Entretanto, apesar da sua importância, relativamente, têm recebido menos atenção que a volumetria envolvendo reações não-redox. Não há uma razão específica que possa ser atribuída à essa observação, mas se pode especular se isso não se deve fato de que o uso de procedimentos analíticos envolvendo processos de óxido-redução exigem conhecimentos teóricos e cuidados experimentais adicionais. Esse artigo busca dar uma visão geral ao leitor sobre a volumetria de óxido-redução e suas curvas de titulação, chamando a atenção para a necessidade de maior cuidado ao trabalhar com esta técnica.

9

Bruce, Peter G. "(Invited) O-Redox Cathodes the Role of Trapped O₂." ECS Meeting Abstracts MA2021-02, no. 2 (October 19, 2021): 187. http://dx.doi.org/10.1149/ma2021-022187mtgabs.

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10

Santos, André Bezerra dos. "Aplicação conjunta de tratamento anaeróbio termofílico por lodo granular e de mediadores redox na remoção de cor de águas residuárias têxteis." Engenharia Sanitaria e Ambiental 10, no. 3 (September 2005): 253–59. http://dx.doi.org/10.1590/s1413-41522005000300010.

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Investigou-se o efeito de diferentes mediadores redox na remoção de cor de corantes azo pelo uso de lodo granular anaeróbio sob condições mesofílicas (30ºC) e termofílicas (55ºC). Adicionalmente, estudou-se em ambas temperaturas, o efeito de diferentes doadores de elétrons nos processos de descoloração. Comprovou-se em tais processos um impacto marcante da adição de concentrações catalíticas de mediadores redox, aumentando a cinética da reação em até 1 ordem de magnitude. Comparado com tratamento mesofílico, remoções de cor sob condições termofílicas foram extremamente aceleradas, além de o impacto dos mediadores redox ser consideravelmente diminuído à 55ºC. Por exemplo, em experimento de fluxo contínuo, eficiências de remoção em torno de 95% e 56% foram obtidas à 55ºC e 30ºC, respectivamente, na ausência de qualquer mediador redox. Hidrogênio se mostrou extremamente efetivo como doador de elétrons para o processo de descoloração redutiva de corantes azo quando comparado com glicose, formiato e acetato. Os resultados obtidos nesta investigação trazem boas perspectivas para o uso conjunto de reatores anaeróbios sob condições termofílicas e de mediadores redox no pré-tratamento das águas residuárias de indústrias têxteis.

11

Kawai, Kosuke, Xiang-Mei Shi, Norio Takenaka, Jeonguk Jang, Mortemard de Boisse Benoit, Akihisa Tsuchimoto, Daisuke Asakura, et al. "Peroxide Formation for Voltage Hysteresis in O2-Type Lithium-Rich Layered Oxides." ECS Meeting Abstracts MA2023-01, no. 2 (August 28, 2023): 490. http://dx.doi.org/10.1149/ma2023-012490mtgabs.

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Development of energy storage systems with high energy density is of vital importance for realizing a sustainable society. Although lithium-ion batteries (LIBs) are the state-of-the-art energy storage technology, their energy density is limited in part by the specific capacity of the positive electrode (cathode) materials. For example, conventional cathode materials, i.e., layered transition-metal oxides LiMO2 (M = transition metal), deliver a modest capacity of approximately 160 mAh/g, where the dominant mechanism of charge compensation for lithium-ion (de)intercalation is the valence change of the transition metal. Further increase in the cathode capacity requires an additional redox center. Integrating an anionic-redox (or oxygen-redox) capacity with the conventional cationic-redox capacity is a promising strategy for large-capacity battery cathodes exceeding present technical limits. However, most oxygen-redox cathodes exhibit a large charge/discharge voltage hysteresis (> 0.5 V), resulting in poor energy efficiency and impractical implementation. Considering immediate electron transfer (O2– → O– + e –) against subsequent structural deformation (O–O dimerization), the overall hypothetical mechanism of the oxygen-redox reactions is described as a square scheme (Figure 1) 1: if an oxidized oxide ion (O–) is stable, it directly contributes to a non-polarizing discharge capacity (nonpolarizing O redox).2 Meanwhile, unstable O– dimerize to form stable peroxo-like O2 2–, which may be accelerated by cation migration. The O2 2– dimers provide a polarizing discharge capacity (polarizing O redox) and an unstable reduced dimer (e.g., O2 4–) decomposes to O2–. The O–O dimerization is prone to result in release of O2 gas (O2 evolution) by their excessive oxidation. However, experimental verification of the square scheme is limited in part due to complicated structural changes during the oxygen-redox reactions. For example, O3-type Li1.2Ni0.2Mn0.6O2 (O3: lithium ions occupy octahedral sites between the MO2 layers, and the packing arrangement of the oxide ions is ABCABC) exhibits irreversible structural degradation such as layered-to-spinel transformation and surface cation densification upon cycling. In this work, we focus on O2-type lithium-rich layered transition-metal oxides that possess structural integrity against the oxygen-redox reactions (O2: lithium ions occupy octahedral sites between the MO2 layers and the packing arrangement of the oxide ions is ABCBA). O2-type Li1.12–y Ni0.17Mn0.71O2 delivers a large reversible capacity greater than 200 mAh/g with minimal voltage decay and capacity fading upon cycling. Combination of X-ray absorption/emission spectroscopy, magnetic susceptibility measurements, and density functional theory calculations indicates bond-forming 2O– → O2 2– and bond-cleaving O2 4– → 2O2– processes. These results emphasize the importance of suppressing the formation of O2 2– and maximizing the contribution of the nonpolarizing O2–/O– redox couple to develop energy-efficient oxygen-redox battery electrodes. Furthermore, based on the electrochemical kinetic analysis, particularly for the 2O2– → O2 2– transformation, technical strategies to quantify non-polarizing and energy-efficient oxygen redox will be discussed. References M. Okubo, et al., Acc. Mater. Res. 2021, 3, 33–41. A. Tsuchimoto, et al., Nat. Commun. 2020, 12, 63. K. Kawai, et al., Energy Environ. Sci. 2022, 15, 2591–2600. Figure 1

12

Kim, Duho, Maenghyo Cho, and Kyeongjae Cho. "Rational design of Na(Li1/3Mn1/2Cr1/6)O2 exhibiting cation–anion-coupled redox reactions with superior electrochemical, thermodynamic, atomic, and chemomechanical properties for advanced sodium-ion batteries." Journal of Materials Chemistry A 6, no. 37 (2018): 18036–43. http://dx.doi.org/10.1039/c8ta02435a.

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Based on a cation–anion-coupled redox paradigm, Na(Li_1/3Mn_1/2Cr_1/6)O₂ is systematically designed to use rational anion redox reactions (O²⁻/O⁻) for high energy density cathodes in sodium-ion batteries.

13

Maria Michałowska-Kaczmarczyk, Anna, and Tadeusz Michałowski. "Some Regularities Inherent in the Balance 2∙f(O) – f(H) Formulated for an Electrolytic System with Symproportionation Reactions Involved." Academic Journal of Chemistry, no. 61 (March 3, 2021): 1–11. http://dx.doi.org/10.32861/ajc.61.1.11.

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The general properties of the balance f12 = 2∙f(O) – f(H), as the linear combination of elemental balances: f1 = f(H) for H and f2 = f(O) for O, formulated for electrolytic systems, are presented. These properties/regularities are inherently related to linear combination (LC) of f12 with charge (f0) and other elemental/core balances fk = f(Yk) (Yk ≠ H, O), expressed by, where the multipliers dk are involved with oxidation numbers (ONs) of the elements in the system in question. The linear dependence or independence of f12 from f0,f3,…, fK, expressed by LC, provides the general criterion distinguishing between non-redox and redox systems. The f12 is the primary form of Generalized electron balance (GEB), completing the set of K independent balances f0,f12,f3,…,fK needed for the solution of a redox system according to GATES/GEB principles. For the solution of a non-redox system, the set of K–1 independent equations f0,f3,…,fK is required. In this formulation, the terms: ONs, oxidant, reductant, and equivalent mass are derivative/redundant concepts. These properties/regularities of f12 are illustrated here by a redox system where symproportionation reactions occur.

14

Hu, Enyuan, Qinghao Li, Xuelong Wang, Fanqi Meng, Jue Liu, Jie-Nan Zhang, Katharine Page, et al. "Oxygen-redox reactions in LiCoO2 cathode without O–O bonding during charge-discharge." Joule 5, no. 3 (March 2021): 720–36. http://dx.doi.org/10.1016/j.joule.2021.01.006.

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15

Soper, Jake D., Sergey V. Kryatov, Elena V. Rybak-Akimova, and Daniel G. Nocera. "Proton-Directed Redox Control of O−O Bond Activation by Heme Hydroperoxidase Models." Journal of the American Chemical Society 129, no. 16 (April 2007): 5069–75. http://dx.doi.org/10.1021/ja0683032.

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16

Hu, Enyuan, Qinghao Li, Xuelong WANG, Xiqian Yu, Wanli Yang, and Xiao-Qing Yang. "Oxygen Redox Reactions in LiCoO2 Cathode without O-O Bonding during Charge-Discharge." ECS Meeting Abstracts MA2020-02, no. 1 (November 23, 2020): 148. http://dx.doi.org/10.1149/ma2020-021148mtgabs.

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17

Bawol, P. P., P. Reinsberg, C. J. Bondue, A. A. Abd-El-Latif, P. Königshoven, and H. Baltruschat. "A new thin layer cell for battery related DEMS-experiments: the activity of redox mediators in the Li–O2 cell." Physical Chemistry Chemical Physics 20, no. 33 (2018): 21447–56. http://dx.doi.org/10.1039/c8cp03592j.

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The activity of four different redox mediators was investigated with DEMS. The paper provides information about the underlying mechanism of Li₂O₂ oxidation by a redox mediator as well as about the stability of the redox mediator.

18

Ali, Mohamed, Mohamoud M. Mohamoud M. Kahder, Sara Khalid Elbordini, and Mona A. Mushtaha. "A comparison of the redox properties of Co₃O₄, Co₃O₄/Al₂O₃ and Co₃O₄/Re/Al₂O₃ catalysts." Qatar Foundation Annual Research Forum Proceedings, no. 2012 (October 2012): EEP1. http://dx.doi.org/10.5339/qfarf.2012.eep1.

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19

Aguiar Jr., Aderbal S., and Ricardo A. Pinho. "Efeitos do exercício físico sobre o estado redox cerebral." Revista Brasileira de Medicina do Esporte 13, no. 5 (October 2007): 355–60. http://dx.doi.org/10.1590/s1517-86922007000500014.

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A atividade física é conhecida por promover saúde e bem-estar. O exercício também é responsável por aumentar a produção de Espécies Reativas de Oxigênio (ERO) pelo acréscimo do consumo de oxigênio mitocondrial nos tecidos. O desequilíbrio entre a produção de EROs e as defesas oxidantes dos tecidos pode provocar danos oxidativos a proteínas, lipídios e DNA. O dano oxidativo cerebral é um mecanismo etiopatológico comum da apoptose e da neurodegeneração. O fator de crescimento cérebro-derivado desempenha um importante papel neste contexto. Nesta revisão, apresentamos os resultados de diferentes modelos de exercício físico no metabolismo oxidativo e neurotrófico do Sistema Nervoso Central (SNC). Também revisamos estudos que utilizaram suplementação antioxidante para prevenir danos oxidativos exercício-induzido ao SNC. Os modelos de exercício físico mais comuns foram as rodas de correr, a natação e a esteira com configurações de treinamento muito diferentes como a duração e a intensidade. Os resultados do treinamento físico no tecido cerebral são muito controversos, mas geralmente demonstram ganhos na plasticidade sináptica e na função cognitiva com exercícios de intensidade moderada e baixa.

20

Sedgwick, Edward G., and Philip D. Bragg. "pH probes respond to redox changes in cytochrome o." Archives of Biochemistry and Biophysics 282, no. 2 (November 1990): 372–76. http://dx.doi.org/10.1016/0003-9861(90)90131-h.

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21

Möller, Angela, Peer Schmidt, and Oliver Fastje. "Redox-Reaktion und Gasphasenabscheidung im System In/Mn/O." Zeitschrift für anorganische und allgemeine Chemie 633, no. 10 (August 2007): 1654–58. http://dx.doi.org/10.1002/zaac.200700100.

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22

Huang, Tzu-Yang, Matthew J. Crafton, Yuan Yue, Wei Tong, and Bryan D. McCloskey. "Deconvolution of intermixed redox processes in Ni-based cation-disordered Li-excess cathodes." Energy & Environmental Science 14, no. 3 (2021): 1553–62. http://dx.doi.org/10.1039/d0ee03526b.

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23

Baryshnikova, Svetlana V., and Andrey I. Poddel’sky. "Heteroligand Metal Complexes with Extended Redox Properties Based on Redox-Active Chelating Ligands of o-Quinone Type and Ferrocene." Molecules 27, no. 12 (June 19, 2022): 3928. http://dx.doi.org/10.3390/molecules27123928.

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A combination of different types of redox-active systems in one molecule makes it possible to create coordination compounds with extended redox abilities, combining molecular and electronic structures determined by the features of intra- and intermolecular interactions between such redox-active centres. This review summarizes and analyses information from the literature, published mainly from 2000 to the present, on the methods of preparation, the molecular and electronic structure of mixed-ligand coordination compounds based on redox-active ligands of the o-benzoquinone type and ferrocenes, ferrocene-containing ligands, the features of their redox properties, and some chemical behaviour.

24

Ho, Wei Huan, Tsung-Yi Chen, Ken-ichi Otake, Yu-Chuan Chen, Yi-Sen Wang, Jun-Hong Li, Han-Yi Chen, and Chung-Wei Kung. "Polyoxometalate adsorbed in a metal–organic framework for electrocatalytic dopamine oxidation." Chemical Communications 56, no. 79 (2020): 11763–66. http://dx.doi.org/10.1039/d0cc04904b.

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A redox-active polyoxometalate, V₁₀O₂₈, was immobilized into a water-stable zirconium-based metal–organic framework, NU-902. The V₁₀O₂₈@NU-902 can show redox hopping-based charge transport and electrocatalytic activity for dopamine sensing.

25

Nguyen, T. B., L. Ermolenko, and A. Al-Mourabit. "Redox condensation of o-halonitrobenzene with 1,2,3,4-tetrahydroisoquinoline: involvement of an unexpected auto-catalyzed redox cascade." Chemical Communications 52, no. 27 (2016): 4914–17. http://dx.doi.org/10.1039/c6cc01436d.

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26

Michalowska-Kaczmarczyk, Anna M., and Tadeusz Michalowski. "Physicochemical and Analytical Implications of GATES/GEB Principles." Journal of Biomedical Research & Environmental Sciences 2, no. 12 (December 2021): 1202–10. http://dx.doi.org/10.37871/jbres1373.

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The fundamental property of electrolytic systems involved with linear combination f12 = 2∙f(O) – f(H) of elemental balances: f1 = f(H) for Y1 = H, and f2 = f(O) for Y2 = O, is presented. The dependency/independency of the f12 on Charge Balance (f0 = ChB) and other elemental and/or core balances fk = f(Yk) (k = 3,…,K) is the general criterion distinguishing between non-redox and redox systems. The f12 related to a redox system is the primary form of a Generalized Electron Balance (GEB), formulated for redox systems within the Generalized Approach to Electrolytic System (GATES) as GATES/GEB ⊂ GATES. The set of K balances f0,f12,f3,…,fK is necessary/ sufficient/needed to solve an electrolytic redox system, while the K-1 balances f0,f3,…,fK are the set applied to solve an electrolytic non-redox system. The identity (0 = 0) procedure of checking the linear independency/ dependency property of f12 within the set f0,f12,f3,…,fK (i) provides the criterion distinguishing between the redox and non-redox systems and (ii) specifies Oxidation Numbers (ONs) of elements in particular components of the system, and in the species formed in the system. Some chemical concepts, such as oxidant, reductant, oxidation number, equivalent mass, stoichiometry, perceived as derivative within GATES, are indicated. All the information is gained on the basis of the titration Ce(SO4)2 (C) + H2SO4 (C1) + CO2 (C2) ⇨ FeSO4 (C0) + H2SO4 (C01) + CO2 (C02), simulated with use of the iterative computer program MATLAB.

27

Zhu, Yun Guang, Chuankun Jia, Jing Yang, Feng Pan, Qizhao Huang, and Qing Wang. "Dual redox catalysts for oxygen reduction and evolution reactions: towards a redox flow Li–O2 battery." Chemical Communications 51, no. 46 (2015): 9451–54. http://dx.doi.org/10.1039/c5cc01616a.

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Corrêa, Cássia Aparecida Rabelo, Sérgio Francisco de Aquino, Paula Cristina de Paula Caldas, and Silvana de Queiroz Silva. "Uso de extrato de levedura como fonte de carbono e de mediadores redox, para a degradação anaeróbia de corante azo." Engenharia Sanitaria e Ambiental 14, no. 4 (December 2009): 559–68. http://dx.doi.org/10.1590/s1413-41522009000400016.

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O trabalho investigou a influência do uso do extrato de levedura, fonte dos mediadores redox riboflavina e nicotinamida, na remoção de cor de solução de corante azo Drimaren Azul HF-RL em condições anaeróbias. O trabalho envolveu a execução de ensaios em batelada, em frascos-reatores mantidos a 25 ºC, incubados com o azo-corante e lodo anaeróbio na presença e ausência de fontes de carbono (extrato de levedura ou glicose) e de mediadores redox (riboflavina ou extrato de levedura). O monitoramento da variação temporal de cor, a demanda química de oxigênio (DQO) e ácidos graxos voláteis (AGV) mostraram que a adição de extrato de levedura (0,5 g/L) resultou em eficiências de remoção de cor de 80 a 85% nas primeiras 24 horas de incubação, e que os produtos da degradação do azo-corante foram tóxicos para todo o consórcio anaeróbio, o que resultou em baixas eficiências de remoção de DQO na presença e ausência do extrato de levedura. Os resultados indicaram, ainda, que as eficiências de remoção de cor foram inferiores a 30% na presença de apenas glicose (fonte de carbono) ou riboflavina (mediador redox), indicando que o extrato de levedura atuou simultaneamente como fonte de carbono e de mediadores redox.

29

Khatua, S., T. Naskar, C. Nandi, and A. Majumdar. "Mononuclear bis(dithiolene) Mo(iv) and W(iv) complexes with P,P; S,S; O,S and O,O donor ligands: a comparative reactivity study." New Journal of Chemistry 41, no. 18 (2017): 9769–83. http://dx.doi.org/10.1039/c7nj01797a.

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30

Braúna, Carlos Henrique da Costa, Suetônio Mota, and André Bezerra dos Santos. "Descoloração redutiva do corante azo RR2 na ausência e presença de mediador redox e aceptor de elétrons nitrato." Engenharia Sanitaria e Ambiental 14, no. 2 (June 2009): 275–84. http://dx.doi.org/10.1590/s1413-41522009000200015.

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A presente investigação teve como objetivo estudar o efeito do nitrato na descoloração de corantes em reatores anaeróbios suplementados ou não com mediadores redox. Dois reatores anaeróbios em paralelo foram operados com tempo de detenção hidráulica (TDH) de dez horas, utilizando-se etanol como cossubstrato. Os resultados provaram que os reatores eram eficientes na remoção de cor, sendo o composto etanol um eficiente doador de elétrons para sustentar a redução do corante azo nos reatores mesofílicos. O mediador redox AQDS aumentou as taxas de redução do corante azo, mas o seu efeito não foi tão marcante comparado aos experimentos realizados anteriormente. Contrariamente às hipóteses levantadas de que a adição de nitrato poderia interferir nas taxas de remoção de cor e propriedades catalíticas do mediador redox, não se verificou nenhum efeito desse composto.

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Gould, S. B., S. G. Garg, M. Handrich, S. Nelson-Sathi, N. Gruenheit, A. G. M. Tielens, and W. F. Martin. "Adaptation to life on land at high O 2 via transition from ferredoxin-to NADH-dependent redox balance." Proceedings of the Royal Society B: Biological Sciences 286, no. 1909 (August 21, 2019): 20191491. http://dx.doi.org/10.1098/rspb.2019.1491.

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Pyruvate : ferredoxin oxidoreductase (PFO) and iron only hydrogenase ([Fe]-HYD) are common enzymes among eukaryotic microbes that inhabit anaerobic niches. Their function is to maintain redox balance by donating electrons from food oxidation via ferredoxin (Fd) to protons, generating H 2 as a waste product. Operating in series, they constitute a soluble electron transport chain of one-electron transfers between FeS clusters. They fulfil the same function—redox balance—served by two electron-transfers in the NADH- and O 2 -dependent respiratory chains of mitochondria. Although they possess O 2 -sensitive FeS clusters, PFO, Fd and [Fe]-HYD are also present among numerous algae that produce O 2 . The evolutionary persistence of these enzymes among eukaryotic aerobes is traditionally explained as adaptation to facultative anaerobic growth. Here, we show that algae express enzymes of anaerobic energy metabolism at ambient O 2 levels (21% v/v), Chlamydomonas reinhardtii expresses them with diurnal regulation. High O 2 environments arose on Earth only approximately 450 million years ago. Gene presence/absence and gene expression data indicate that during the transition to high O 2 environments and terrestrialization, diverse algal lineages retained enzymes of Fd-dependent one-electron-based redox balance, while the land plant and land animal lineages underwent irreversible specialization to redox balance involving the O 2 -insensitive two-electron carrier NADH.

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Chang, Christopher J., Leng Leng Chng, and Daniel G. Nocera. "Proton-Coupled O−O Activation on a Redox Platform Bearing a Hydrogen-Bonding Scaffold." Journal of the American Chemical Society 125, no. 7 (February 2003): 1866–76. http://dx.doi.org/10.1021/ja028548o.

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33

Nolan, M., S. Xiao, B. C. Gill, D. Jones, and C. Zhou. "Evaluación de la Formación ediacárica de Doushantuo: mejora de la correlación estratigráfica de las pizarras negras de Doushantuo superior a partir del contenido en mercurio." Estudios Geológicos 75, no. 2 (November 21, 2019): 107. http://dx.doi.org/10.3989/egeol.43595.562.

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Los enriquecimientos de mercurio en la unidad de esquisto negro de la Formación ediacárica de Doushantuo son probablemente el resultado de la influencia volcánica o del depósito de mercurio mediante anoxia. Si los enriquecimientos de Hg son de origen volcánico, o se deben a una anoxia regional contemporánea, entonces los patrones de enriquecimiento de Hg son consistentes con la correlación convencional de estas unidades, con las unidades tripartitas equivalentes a la pizarra negra del Miembro IV. Además, la comparación de los datos redox de los intervalos de enriquecimiento en Hg podría indicar si los enriquecimientos se deben a cambios comparables en las condiciones redox, o a un aumento de la entrada de Hg bajo diferentes condiciones redox, consistente con la influencia volcánica.

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Bolgiano, B., I. Salmon, W. J. Ingledew, and R. K. Poole. "Redox analysis of the cytochrome o-type quinol oxidase complex of Escherichia coli reveals three redox components." Biochemical Journal 274, no. 3 (March 15, 1991): 723–30. http://dx.doi.org/10.1042/bj2740723.

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Potentiometric analyses of the cytochrome o-type oxidase of Escherichia coli, using membranes from a strain containing amplified levels of the cytochrome bo complex, were conducted to resolve the redox centres of the oxidase. The cytochrome o-type oxidase of E. coli, a quinol oxidase, contains 2 mol of b-type haem per mol of complex and copper. Detailed analysis of potentiometric titrations, based on the absorbance of the Soret band, suggests that there are three contributions with midpoint potentials (Em,7) around +55 mV, +211 mV and +408 mV, all with maxima at 426-430 nm in the reduced state. In the alpha region of the spectra, a component with Em,6.85 = +58 mV has a maximal peak at 557 nm, and twin peaks at 556 and 564 nm nitrate with Em,6.85 = +227 mV. A feature corresponding to the highest potential Soret contribution was not observed. These data can be explained either by a model incorporating haem-haem interaction or by attributing the shorter-wavelength band (557 nm) to haem b and a split alpha-band (556, 564 nm) to the haem o (oxygen-binding haem b). Absolute spectra of oxidized membranes show continuous absorbance from 460 to 530 nm and suggest the presence of a high-spin haem component in the membranes. Monitoring absorbance at 635 minus 672 nm, contributions with midpoints (Em,7) around +52 mV, +234 mV and +371 mV are observed. This latter contribution is possibly the highest-potential component which titrates with Em greater than +400 mV in the Soret region and may represent copper-haem coupling in the cytochrome o complex.

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Messias, Indira Ashant Martins, Eduardo Guimarães Couto, Ricardo Silva Santos Amorim, Mark Stephen Johnson, and Osvaldo Borges Pinto Junior. "Monitoramento contínuo do potencial redox e de variáveis complementares em ambiente hipersazonal no Pantanal Norte." Revista Brasileira de Ciência do Solo 37, no. 3 (June 2013): 632–39. http://dx.doi.org/10.1590/s0100-06832013000300009.

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A análise conjunta do potencial redox com outras variáveis pode ser útil para o entendimento da dinâmica dos solos hidromórficos, ao longo de todo o ciclo hidrológico a que o Pantanal está submetido. Neste trabalho, foram estudados o potencial redox e algumas variáveis do solo (CO2, O2, temperatura, umidade e potencial matricial) pelo monitoramento contínuo e ininterrupto. Para isso, foram realizadas determinações nas profundidades de 10 e 30 cm num Planossolo Háplico alítico gleissólico, na fitofisionomia Cerrado sensu stricto. O trabalho foi realizado de fevereiro de 2010 a julho de 2011 na RPPN (Reserva Particular do Patrimônio Natural/Sistema Nacional de Unidades de Conservação - SNUC), Estância Ecológica SESC (Serviço Social do Comércio) Pantanal, município de Barão de Melgaço, nordeste do Pantanal de Mato Grosso. Os valores do potencial redox variaram de 636 mV (enchente) a -341 mV (cheia), caracterizando ambiente anaeróbico na estação da cheia e ambiente oxidado nas demais estações do ciclo hidrológico, o que indica que o potencial redox é ferramenta versátil para compreender as reações de oxirredução nos solos hidromórficos do Pantanal mato-grossense, pois os valores diminuíram quando o teor de umidade era elevado. Além disto, o estudo evidenciou também que o monitoramento contínuo de variáveis complementares pode ser importante por permitir análise mais aprofundada das condições de hipersazonalidade, em que esses solos estão submetidos. Neste contexto, o potencial matricial e a umidade foram as variáveis de maior importância para explicar a variação do conjunto de dados obtidos ao longo do ciclo hidrológico, o que indica que esses parâmetros físicos são determinantes nos processos biológicos desse solo tropical com hipersazonalidade hídrica.

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Salavagione, H. J., J. Arias-Pardilla, J. M. Pérez, J. L. Vázquez, E. Morallón, M. C. Miras, and C. Barbero. "Study of redox mechanism of poly(o-aminophenol) using in situ techniques: evidence of two redox processes." Journal of Electroanalytical Chemistry 576, no. 1 (February 2005): 139–45. http://dx.doi.org/10.1016/j.jelechem.2004.10.013.

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37

Smolyaninov, I. V., D. A. Burmistrova, N. P. Pomortseva, Yu K. Voronina, A. I. Poddel’sky, N. T. Berberova, and I. L. Eremenko. "Complexes R2Sn(IV)L with O,N,O'-Donor Schiff Bases: Synthesis, Structures, and Redox Properties." Координационная химия 49, no. 3 (March 1, 2023): 138–56. http://dx.doi.org/10.31857/s0132344x22600266.

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New tin(IV) complexes with O,N,O'-donor Schiff bases (L1H2–L4H2) of the (Ln)SnR2 type (R = Ph (I–III), Et (IV–VII)) are synthesized and characterized. The molecular structures of compounds I–III, VI, and VII in the crystalline form are determined by X-ray diffraction (XRD) (CIF files CCDC nos. 2181140 (I), 2181142 (II), 2181143 (III∙CH3CN), 2181141 (VI), and 2181139 (VII)). Tin complexes I–III and VI are mononuclear pentacoordinate compounds. Crystalline complex VII forms dimers via the pairwise bridging coupling between the oxygen and tin atoms of the mononuclear fragments. The redox-active ligand in the synthesized compounds exists as the iminobis(phenolate) dianion. The electrochemical properties of free ligands and complexes I–VII are studied. In the case of compounds I, II, IV, and V with tert-butyl substituents in the redox-active ligand, the formation of relatively stable monocationic and monoanionic species is electrochemically detected for the first time. The presence of the electroactive nitro group results in the destabilization of the oxidized forms of the complexes and induces the appearance of an additional peak in the cathodic range. The energy gaps between the frontier redox orbitals are determined by the electrochemical and spectral methods. The obtained parameters are close and vary in a range of 2.43–2.68 eV.

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Boivin, Edouard, Jean-Noël Chotard, Christian Masquelier, and Laurence Croguennec. "Towards Reversible High-Voltage Multi-Electron Reactions in Alkali-Ion Batteries Using Vanadium Phosphate Positive Electrode Materials." Molecules 26, no. 5 (March 6, 2021): 1428. http://dx.doi.org/10.3390/molecules26051428.

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Vanadium phosphate positive electrode materials attract great interest in the field of Alkali-ion (Li, Na and K-ion) batteries due to their ability to store several electrons per transition metal. These multi-electron reactions (from V2+ to V5+) combined with the high voltage of corresponding redox couples (e.g., 4.0 V vs. for V3+/V4+ in Na3V2(PO4)2F3) could allow the achievement the 1 kWh/kg milestone at the positive electrode level in Alkali-ion batteries. However, a massive divergence in the voltage reported for the V3+/V4+ and V4+/V5+ redox couples as a function of crystal structure is noticed. Moreover, vanadium phosphates that operate at high V3+/V4+ voltages are usually unable to reversibly exchange several electrons in a narrow enough voltage range. Here, through the review of redox mechanisms and structural evolutions upon electrochemical operation of selected widely studied materials, we identify the crystallographic origin of this trend: the distribution of PO4 groups around vanadium octahedra, that allows or prevents the formation of the vanadyl distortion (O…V4+=O or O…V5+=O). While the vanadyl entity massively lowers the voltage of the V3+/V4+ and V4+/V5+ couples, it considerably improves the reversibility of these redox reactions. Therefore, anionic substitutions, mainly O2− by F−, have been identified as a strategy allowing for combining the beneficial effect of the vanadyl distortion on the reversibility with the high voltage of vanadium redox couples in fluorine rich environments.

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Broere, Daniël L. J., Raoul Plessius, and Jarl Ivar van der Vlugt. "New avenues for ligand-mediated processes – expanding metal reactivity by the use of redox-active catechol, o-aminophenol and o-phenylenediamine ligands." Chemical Society Reviews 44, no. 19 (2015): 6886–915. http://dx.doi.org/10.1039/c5cs00161g.

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Ali, Mohamed, and Mahmoud Khader. "Study of the redox properties of Co₃O₄/SiO₂ catalysts." Qatar Foundation Annual Research Forum Proceedings, no. 2012 (October 2012): EEP6. http://dx.doi.org/10.5339/qfarf.2012.eep6.

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41

Kump, L. R., and R. M. Garrels. "Modeling atmospheric O 2 in the global sedimentary redox cycle." American Journal of Science 286, no. 5 (May 1, 1986): 337–60. http://dx.doi.org/10.2475/ajs.286.5.337.

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42

Piskunov, Alexandr V., Irina N. Mescheryakova, Georgy K. Fukin, Vladimir K. Cherkasov, and Gleb A. Abakumov. "Indium(iii) complexes with o-iminobenzoquinone in different redox states." New Journal of Chemistry 34, no. 8 (2010): 1746. http://dx.doi.org/10.1039/c0nj00229a.

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43

Han, Seong-Jeong, Byung Cheon Lee, Sun Hee Yim, Vadim N. Gladyshev, and Seung-Rock Lee. "Characterization of Mammalian Selenoprotein O: A Redox-Active Mitochondrial Protein." PLoS ONE 9, no. 4 (April 21, 2014): e95518. http://dx.doi.org/10.1371/journal.pone.0095518.

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Satsuma, Atsushi, Satit Phiyanalinmat, Miki Yashiro, and Tadashi Hattori. "Number of surface redox sites of V-Sb-O catalysts." Research on Chemical Intermediates 26, no. 2 (January 2000): 113–19. http://dx.doi.org/10.1163/156856700x00147.

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45

Dansen, Tobias B. "Forkhead Box O Transcription Factors: Key Players in Redox Signaling." Antioxidants & Redox Signaling 14, no. 4 (February 15, 2011): 559–61. http://dx.doi.org/10.1089/ars.2010.3778.

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46

Pisarevskaya, E. Yu, E. V. Ovsyannikova, and N. M. Alpatova. "Electrochemical and chemical modification of poly-o-phenylenediamine redox polymer." Russian Journal of Electrochemistry 42, no. 12 (December 2006): 1275–82. http://dx.doi.org/10.1134/s1023193506120020.

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47

Paul, Anirudra, Alafate Adili, and Daniel Seidel. "Redox-Annulations of Cyclic Amines with Electron-Deficient o-Tolualdehydes." Organic Letters 21, no. 6 (March 6, 2019): 1845–48. http://dx.doi.org/10.1021/acs.orglett.9b00438.

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48

Shah, Anwar-ul-Haq Ali, and Rudolf Holze. "Poly(o-aminophenol) with two redox processes: A spectroelectrochemical study." Journal of Electroanalytical Chemistry 597, no. 2 (December 2006): 95–102. http://dx.doi.org/10.1016/j.jelechem.2006.08.004.

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Wathen, Steven P., and Anthony W. Czarnik. "Copper-catalyzed redox deacylation of isomeric N- and O-benzoylhydroxylamines." Journal of Organic Chemistry 57, no. 23 (November 1992): 6129–33. http://dx.doi.org/10.1021/jo00049a016.

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50

Deng, Qing, and Shaojun Dong. "Redox reaction of peroxidase at poly(o-phenylenediamine) modified electrode." Electroanalysis 6, no. 10 (October 1994): 878–81. http://dx.doi.org/10.1002/elan.1140061012.

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