One-electron reduction of thionine studied by pulse radiolysis

Guha, S. N.; Moorthy, P.N.; Kishore, Kamal; Naik, D.B.; Rao, K. N.

doi:10.1007/bf02881248

Cited by 304 publications

(85 citation statements)

References 13 publications

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“…Electron donors 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) and N , N , N ′, N ′-tetramethyl- p -phenylenediamine (TMPD) were obtained from Sigma-Aldrich. The nanosecond pulse radiolysis system employing 7 MeV electrons has been described elsewhere . For a 200 ns pulse, the measured dose was 37 Gy, and for a 500 ns pulse, the measured dose was 42 Gy.…”

Section: Methodsmentioning

confidence: 99%

“…The nanosecond pulse radiolysis system employing 7 MeV electrons has been described elsewhere. 25 For a 200 ns pulse, the measured dose was 37 Gy, and for a 500 ns pulse, the measured dose was 42 Gy. The dosimetry was carried out using an air-saturated aqueous solution containing 5 × 10 −2 M KSCN (Gε = 2.59 ± 0.05 m 2 J −1 at 475 nm).…”

Section: ■ Introductionmentioning

confidence: 97%

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Pulse Radiolysis and Computational Studies on a Pyrrolidinium Dicyanamide Ionic Liquid: Detection of the Dimer Radical Anion

et al. 2018

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A pulse radiolysis study on pyrrolidinium cation based ionic liquids is presented herein. Time-resolved absorption spectra for 1-methyl-1-propylpyrrolidinium dicyanamide (DCA) at 500 ns after the electron pulse show broad absorption bands at wavelengths below 440 nm and at 640 nm. In pyrrolidinium bis(trifluoromethylsulfonyl)imide (NTf) and tris(perfluoroethyl)trifluorophosphate (FAP) ILs, the transient absorption below 440 nm is much weaker. The absorption at 500 ns, which increases with wavelength from 500 nm to beyond 800 nm, was assigned to the tail of the solvated electron NIR absorption spectrum, since it disappears in the presence of NO. In the DCA IL, the presence of a reducing species was confirmed by the formation of pyrene radical anion. The difference in the transient species in the case of the DCA IL compared to other two ILs should be due to the anion, with cations being similar. In pseudohalide ILs such as DCA, radicals are formed by direct hole trapping by the anion (X + h → X), followed by addition to the parent anion. Prediction of the UV/vis absorption spectra of the dimer radical anion by computational calculation supports the experimental results. The oxidizing efficiency of (DCA) and its reduction potential ( E) have been determined.

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Section: Methodsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 97%

Pulse Radiolysis and Computational Studies on a Pyrrolidinium Dicyanamide Ionic Liquid: Detection of the Dimer Radical Anion

et al. 2018

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“…Electron pulse radiolysis experiments were performed using a set-up which has already been discussed in detail elsewhere. 30 TA profiles and time-resolved TA spectra were recorded with subpicosecond time resolution (B120 fs) using a pump-probe spectrometer, which has been described in detail elsewhere. 31 Briefly, it uses a amplified laser system based on a Ti : sapphire oscillator (Thales Optronique SA, Elancourt, France).…”

Section: Methodsmentioning

confidence: 99%

Probing excited state charge transfer dynamics in a heteroleptic ruthenium complex

Ghosh

Palit

2014

Phys. Chem. Chem. Phys.

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Dynamics of metal to ligand charge transfer in the excited states of ruthenium polypyridyl complexes, which have shown promise as materials for artificial solar energy harvesting, has been of immense interest recently. Mixed ligand complexes are especially important for broader absorption in the visible region. Dynamics of ultrafast vibrational energy relaxation and inter-ligand charge transfer processes in the excited states of a heteroleptic ruthenium complex, [Ru(bpy)2(pap)](ClO4)2 (where bpy is 2,2'-bipyridine and pap is 2-(phenylazo)pyridine) have been investigated using femtosecond to nanosecond time-resolved transient absorption spectroscopic techniques. A good agreement between the TA spectrum of the lowest excited (3)MLCT state of [Ru(bpy)2(pap)](ClO4)2 complex and the anion radical spectrum of the pap ligand, which has been generated using the pulse radiolysis technique, confirmed the charge localization at the pap ligand. While the lifetime of the inter-ligand charge transfer from the bpy to the pap ligand in the (3)MLCT state is about 2.5 ps, vibrational cooling of the pap-localized(3)MLCT state occurs over a much longer time scale with a lifetime of about 35 ps. Ultrafast charge localization dynamics observed here may have important consequences in artificial solar energy harvesting systems, which employ heteroleptic ruthenium complexes.

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“…Pulse radiolysis experiments with optical detection were carried out using 7 MeV electron pulses (pulse width 50 ns) from a linear accelerator at the Bhabha Atomic Research Centre, Mumbai as described previously. 18 A KSCN dosimeter was used in the optical pulse radiolysis. The dose per pulse was between 10-15 Gy.…”

Section: Methodsmentioning

confidence: 99%

Kinetics, spectral and redox behaviour of OH adducts of methylxanthines: a radiation chemical study 1

Vinchurkar¹,

Rao²,

Mohan³

et al. 1999

J. Chem. Soc., Perkin Trans. 2

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One-electron reduction of thionine studied by pulse radiolysis

Cited by 304 publications

References 13 publications

Pulse Radiolysis and Computational Studies on a Pyrrolidinium Dicyanamide Ionic Liquid: Detection of the Dimer Radical Anion

Pulse Radiolysis and Computational Studies on a Pyrrolidinium Dicyanamide Ionic Liquid: Detection of the Dimer Radical Anion

Probing excited state charge transfer dynamics in a heteroleptic ruthenium complex

Kinetics, spectral and redox behaviour of OH adducts of methylxanthines: a radiation chemical study 1

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