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

Bose, Arup; Basu, Samita

doi:10.1016/j.jlumin.2009.07.007

Cited by 14 publications

(19 citation statements)

References 24 publications

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“…However, the probability of ET from three pyrimidines to AQ did not follow the E ox sequence. The similar phenomena were observed in the photochemical reaction of 1,8-dihydroxyanthraquinone (DHAQ) and nucleobases (20,22). Therefore, the substituent group on pyrimidine or purine has shown a significant effect on the ET efficiency, as well as the E ox values.…”

Section: Introductionsupporting

confidence: 61%

“…It agrees with the present experimental conclusions. Additionally, the ET possibility sometime does not follow the E ox order in the previous studies, for example, for 1,8‐dihydroxyanthraquinone and 9,10‐anthraquinone , where the steric hindrance plays a significant role as well as E ox . However, the similar phenomena are not observed for the present reaction.…”

Section: Resultsmentioning

confidence: 80%

“…It is worth noting that the absorption of

{normalA}^{\cdot +}

is located at ~360 nm and overlapped with that of 3 NQ*(T 1 ) at 374 nm. The overlapping causes the band slightly blueshifted from 374 to 363 nm in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Radical pairs and radical cations produced in the ET and HA processes were observed in transient‐state photolysis . Interestingly, the ET efficiency from A, C, T and U to MQ showed a consistent order with the E ox value . However, the probability of ET from three pyrimidines to AQ did not follow the E ox sequence.…”

Section: Introductionmentioning

confidence: 97%

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Photochemical Reaction Between 1,2‐Naphthoquinone and Adenine in Binary Water‐Acetonitrile Solutions

Zhou

Wei

Liu

et al. 2017

Photochem & Photobiology

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The photochemical reaction between 1,2-naphthoquinone (NQ) and adenine was investigated using nanosecond timeresolved laser flash photolysis. With photolysis at 355 nm, the lowest triplet state T 1 of NQ was produced via intersystem crossing from its singlet excited state. The triplet-triplet absorption of the state contributes three bands of transient spectra at 374, 596 and 650 nm, respectively, in pure acetonitrile and binary water-acetonitrile solutions. In the presence of adenine, the observation of A Á + (at 363 nm) and NQ þH Á radical (at 343 and 485 nm) indicates a multistep mechanism of electron transfer process followed by a proton transfer between 3 NQ* and adenine. By fitting with the Stern-Volmer relationship, the quenching rate constant k q of 3

show abstract

Section: Introductionsupporting

confidence: 61%

Section: Resultsmentioning

confidence: 80%

“…It is worth noting that the absorption of

{normalA}^{\cdot +}

is located at ~360 nm and overlapped with that of 3 NQ*(T 1 ) at 374 nm. The overlapping causes the band slightly blueshifted from 374 to 363 nm in Fig.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Photochemical Reaction Between 1,2‐Naphthoquinone and Adenine in Binary Water‐Acetonitrile Solutions

Zhou

Wei

Liu

et al. 2017

Photochem & Photobiology

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“…Uracil molecule, as a part of the RNA helix, is one of the most studied compounds due to its relevance in pharmacy and biochemistry . Consequently, its acidity, basicity solvation by water molecules, its fragmentation in mass spectrometry, and its reactivity with respect to different reactants and metal ions have been investigated. Their tautomeric forms attracted the attention of many scientists along the years as they are suspected to be behind the genetic mutations .…”

Section: Introductionmentioning

confidence: 99%

Effects of the ionization in the tautomerism of uracil: A reaction electronic flux perspective

et al. 2015

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The one-step tautomerization processes of uracil and its radical cation and radical anion have been investigated in the light of the reaction force and reaction electronic flux (REF) formalisms. The relative energies of the different tautomers as well as the corresponding tautomerization barriers have been obtained through the use of the G4 high-level ab initio method and by means of B3LYP/6-311+G(3df,2p)//B3LYP/6-311+G(d, p) calculations. Systematically, the enol radical cations are more stable in relative terms than the neutral, due to the higher ionization energy of the diketo forms with respect to the enolic ones. Conversely, the enol radical anions, with the only exception of the 2-keto-N1 anion, are found to be less stable than the neutral. The effects of the ionization are also sizable on the tautomerization barriers although this effect also depends on the particular tautomerization process. The reaction force analysis shows that all reactions are mainly activated through structural rearrangements that initiate the electronic activity. This electronic activity is monitored along the reaction coordinate through the REF that obeys a delicate balance between the acid and basic character of the atoms involved in the hydrogen transfer.

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Electrochemical investigation of interactions between quinone derivatives and single stranded DNA

Zhang

Piro

Ramsay

et al. 2012

Electrochimica Acta

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

Cited by 14 publications

References 24 publications

Photochemical Reaction Between 1,2‐Naphthoquinone and Adenine in Binary Water‐Acetonitrile Solutions

Photochemical Reaction Between 1,2‐Naphthoquinone and Adenine in Binary Water‐Acetonitrile Solutions

Effects of the ionization in the tautomerism of uracil: A reaction electronic flux perspective

Electrochemical investigation of interactions between quinone derivatives and single stranded DNA

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