Reaction mechanisms : Part (i) Radical and radical ion reactions

Tanko, James M.

doi:10.1039/b518094p

Cited by 9 publications

(5 citation statements)

References 110 publications

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“…Hence, ET from T will be higher than U. Redox potential (E ox ) value of T is less than U so this is also responsible for a better ET from T than U. Again, this methyl group has also the capability of acting as a better hydrogen donor in T. The methyl group possesses three additional hydrogen atoms, which can be transferred during HA [20,21]. So, the extent of HA will be higher for T too.…”

Section: Resultsmentioning

confidence: 92%

Interaction of quinones with three pyrimidine bases: A laser flash photolysis study

Bose

Basu

2009

Journal of Luminescence

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Section: Resultsmentioning

confidence: 92%

Interaction of quinones with three pyrimidine bases: A laser flash photolysis study

Bose

Basu

2009

Journal of Luminescence

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“…For many important electrochemical reactions, their mechanisms and the nature of adsorbed intermediates can be properly elucidated and identified using thorough theoretical analysis and various experimental techniques. [57][58][59][60][61] Modern spectroscopic techniques 57,61 coupled with electrochemical methods 62 represent powerful means to monitor complex processes at the electrode/electrolyte interface. [63][64][65][66][67][68] While the experimental detection of intermediates and the elucidation of reaction mechanisms are essential, they are not enough for a successful design of efficient catalysts.…”

Section: Activity Descriptorsmentioning

confidence: 99%

Tailoring the catalytic activity of electrodes with monolayer amounts of foreign metals

2013

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During the past decade, electrocatalysis has attracted significant attention primarily due to the increased interest in the development of new generations of devices for electrochemical energy conversion. This has resulted in a progress in both fundamental understanding of the complex electrocatalytic systems and in the development of efficient synthetic schemes to tailor the surface precisely at the atomic level. One of the viable concepts in electrocatalysis is to optimise the activity through the direct engineering of the properties of the topmost layers of the surface, where the reactions take place, with monolayer and sub-monolayer amounts of metals. This forms (bi)metallic systems where the electronic structure of the active sites is optimised using the interplay between the nature and position of the atoms of solute metals at the surface. In this review, we focus on recent theoretical and experimental achievements in designing efficient (bi)metallic electrocatalysts with selective positioning of foreign atoms to form a variety of active catalytic sites at the electrode surface. We summarize recent results published in the literature and outline challenges for computational and experimental electrocatalysis to engineer active and selective catalysts using atomic layers.

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“…But in dmU, both N1 and N3 hydrogen atoms are replaced, thus devoiding the molecule of its acidic protons. Now the sugar moiety is reported to undergo some H abstraction − and the methyl groups have the potential to donate their H, too, , so a very weak H abstraction from dmU in ACN/H 2 O has been discerned. An interesting feature is observed in connection with the behavior of U and dmU.…”

Section: Resultsmentioning

confidence: 99%

Laser Flash Photolysis and Magnetic Field Effect Studies on the Interaction of Uracil and Its Derivatives with Menadione and 9,10-Anthraquinone

Bose

Basu

2008

J. Phys. Chem. A

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Laser flash photolysis and an external magnetic field have been used to study the interaction of two quinone molecules, namely, 9,10-anthraquinone (AQ) and 2-methyl-1,4-naphthoquinone, commonly known as menadione (MQ), with the RNA base uracil (U) and two of its derivatives, 1,3-dimethyluracil (dmU) and uridine (dU). We have conducted our studies in homogeneous organic and heterogeneous micellar media in order to investigate the effect of media on the molecules and any change in reactivity on account of substitution. In organic homogeneous medium, both the quinones have behaved similarly with the bases. Here U has undergone both electron transfer (ET) and hydrogen (H) transfer, while dU and dmU have failed to exhibit any ET. Failure to support ET has been attributed to keto-enol tautomerism, which has been found to have a significant role in determining the occurrence of ET from these pyrimidine bases. However, in SDS micelles some variations regarding the reactivity of these molecules have been discerned. The variations are 2-fold. Here ET from U has been found to get completely eclipsed by a dominant H abstraction with both the quinones, and AQ reveals a difference in the extent of H abstraction with the bases in SDS. With U and dU, the prevailing H abstraction with AQ has succeeded in formation of only AQH(*), while dmU has produced both AQH(*) and AQH(2), the latter being formed by two successive H abstraction. Explanations of this intriguing behavior with U and its derivatives with quinone molecules have been the main concern in this work.

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Reaction mechanisms : Part (i) Radical and radical ion reactions

Cited by 9 publications

References 110 publications

Interaction of quinones with three pyrimidine bases: A laser flash photolysis study

Interaction of quinones with three pyrimidine bases: A laser flash photolysis study

Tailoring the catalytic activity of electrodes with monolayer amounts of foreign metals

Laser Flash Photolysis and Magnetic Field Effect Studies on the Interaction of Uracil and Its Derivatives with Menadione and 9,10-Anthraquinone

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