Kinetic and spectral studies on transient species formed in pulse radiolysis of 2,6-diacetylpyridine in aqueous solutions

Naik, D.B.; Mukherjee, Tulsi

doi:10.1016/j.radphyschem.2005.05.020

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…Since energy transfer and photoinduced electron transfer (pyridine anion radical absorption was not identified) are unfavorable between Au 22 (SG) 18 cluster and PDA (Supplementary Fig. 17 ) 54 , 55 , the faster relaxation process can be attributed to the promoted core-shell transition in PDA-Au 22 (SG) 18 NCs. That may be due to a reduction in interaction distance between kernel and shell after the formation of bis-Schiff base because core-shell transition in noble NCs via a charge recombination mechanism usually displays donor-acceptor distance-dependent electron transfer rate.…”

Section: Resultsmentioning

confidence: 99%

Bis-Schiff base linkage-triggered highly bright luminescence of gold nanoclusters in aqueous solution at the single-cluster level

et al. 2022

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Metal nanoclusters (NCs) have been developed as a new class of luminescent nanomaterials with potential applications in various fields. However, for most of the metal NCs reported so far, the relatively low photoluminescence quantum yield (QY) in aqueous solution hinders their applications. Here, we describe the utilization of bis-Schiff base linkages to restrict intramolecular motion of surface motifs at the single-cluster level. Based on Au22(SG)18 (SG: glutathione) NCs, an intracluster cross-linking system was constructed with 2,6-pyridinedicarboxaldehyde (PDA), and water-soluble gold NCs with luminescence QY up to 48% were obtained. The proposed approach for achieving high emission efficiency can be extended to other luminescent gold NCs with core-shell structure. Our results also show that the content of surface-bound Au(I)-SG complexes has a significant impact on the PDA-induced luminescence enhancement, and a high ratio of Au(I)-SG will be beneficial to increasing the photoluminescence intensity of gold NCs.

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Section: Resultsmentioning

confidence: 99%

Bis-Schiff base linkage-triggered highly bright luminescence of gold nanoclusters in aqueous solution at the single-cluster level

et al. 2022

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“…Compared to this, oxidizing hydroxyl radicals are well-known to undergo addition−elimination reactions with variety of organic compounds . We have earlier carried out pulse radiolysis studies on a good number of nitrogen heterocyclics where organic radicals either transfer an electron giving pyridinyl type of radicals which are highly reducing in nature or in a few cases radical−adduct species were formed. , We report here that the reaction of such reducing organic radicals (viz. α-hydroxyalkyl radicals) with 3,5-pyridinedicarboxylic acid and nicotinic acid at suitable pHs give the radical−adduct species which subsequently undergo an elimination reaction giving the pyridinyl radicals.…”

Section: Introductionmentioning

confidence: 92%

Addition−Elimination in the Reaction of α-Hydroxyalkyl Radicals with 3,5-Pyridinedicarboxylic Acid and Nicotinic Acid: Example of Inner Sphere Organic Electron Transfer

Dhiman

Naik

2007

J. Phys. Chem. A

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Reactions of alpha-hydroxyalkyl radicals with 3,5-pyridinedicarboxylic acid (3,5-PDCA) and nicotinic acid (NA) were studied at appropriate pHs in aqueous solutions by pulse radiolysis technique. At pH 1, CH(3)C*HOH and *CH(2)OH radicals were found to react with 3,5-PDCA by rate constants of 2.2 x 10(9) and 5.1 x 10(8) dm(3) mol(-1) s(-1), respectively, giving radical adduct species. The adduct species formed in the reaction of CH(3)C*HOH radicals with 3,5-PDCA underwent unimolecular decay (k = 9.8 x 10(4) s(-1)) giving pyridinyl radicals. Reaction of (CH(3))(2)C*OH, CH(3)C*HOH, and *CH(2)OH radicals with NA at pH 3.3 gave the adduct species which subsequently decayed to the pyridinyl radicals. At pH 1, wherein NA is present in the protonated form, (CH(3))(2)C*OH radicals directly transfer electrons to NA, whereas CH(3)C*HOH and *CH(2)OH radicals react with higher rate constants compared with those at pH 3.3, initially giving the adduct species which subsequently undergo elimination reaction giving pyridinyl radicals. Reactions of alpha-hydroxyalkyl radicals with 3,5-pyridinedicarboxylic acid and nicotinic acid are found to proceed by an addition-elimination pathway that provides one of the few examples of organic inner sphere electron-transfer reactions. Rate constant for the addition reaction as well as rate of elimination varies with the reduction potential of alpha-hydroxyalkyl radicals.

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Pulse radiolysis studies on reactions of α-hydroxyalkyl radicals with nicotinamide and 6-methyl nicotinic acid

Dhiman

Naik

2012

Radiation Physics and Chemistry

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Kinetic and spectral studies on transient species formed in pulse radiolysis of 2,6-diacetylpyridine in aqueous solutions

Cited by 4 publications

References 16 publications

Bis-Schiff base linkage-triggered highly bright luminescence of gold nanoclusters in aqueous solution at the single-cluster level

Bis-Schiff base linkage-triggered highly bright luminescence of gold nanoclusters in aqueous solution at the single-cluster level

Addition−Elimination in the Reaction of α-Hydroxyalkyl Radicals with 3,5-Pyridinedicarboxylic Acid and Nicotinic Acid: Example of Inner Sphere Organic Electron Transfer

Pulse radiolysis studies on reactions of α-hydroxyalkyl radicals with nicotinamide and 6-methyl nicotinic acid

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