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Fractal analysis of inter-particle interaction forces in gold nanoparticle aggregates. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.03.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Saitow KI, Naitoh Y, Tominaga K, Yoshihara K. Photodissociation of CH2I2 and subsequent electron transfer in solution. Chem Asian J 2008; 3:696-709. [PMID: 18381663 DOI: 10.1002/asia.200700351] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
We studied photoinduced reactions of diiodomethane (CH(2)I(2)) upon excitation at 268 nm in acetonitrile and hexane by subpicosecond-nanosecond transient absorption spectroscopy. The transient spectra involve two absorption bands centered at around 400 (intense) and 540 nm (weak). The transients probed over the range 340-740 nm show common time profiles consisting of a fast rise (<200 fs), a fast decay ( approximately 500 fs), and a slow rise. The two fast components were independent of solute concentration, whereas the slow rise became faster (7-50 ps) when the concentration in both solutions was increased. We assigned the fast components to the generation of a CH(2)I radical by direct dissociation of the photoexcited CH(2)I(2) and its disappearance by subsequent primary geminate recombination. The concentration-dependent slow rise produced the absorption bands centered at 400 and 540 nm. The former consists of different time-dependent bands at 385 and 430 nm. The band near 430 nm grew first and was assigned to a charge-transfer (CT) complex, CH(2)I(2) (delta+)I(delta-), formed by a photofragment I atom and the solute CH(2)I(2) molecule. The CT complex is followed by full electron transfer, which then develops the band of the ion pair CH(2)I(2) (+)I(-) at 385 nm on the picosecond timescale. On the nanosecond scale, I(3) (-) was generated after decay of the ion pair. The reaction scheme and kinetics were elucidated by the time-resolved absorption spectra and the reaction rate equations. We ascribed concentration-dependent dynamics to the CT-complex formation in pre-existing aggregates of CH(2)I(2) and analyzed how solutes are aggregated at a given bulk concentration by evaluating a relative local concentration. Whereas the local concentration in hexane monotonically increased as a function of the bulk concentration, that in acetonitrile gradually became saturated. The number of CH(2)I(2) molecules that can participate in CT-complex formation has an upper limit that depends on the size of aggregation or spatial restriction in the neighboring region of the initially photoexcited CH(2)I(2). Such conditions were achieved at lower concentrations in acetonitrile than in hexane.
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Affiliation(s)
- Ken-Ichi Saitow
- The Graduate University for Advanced Studies, Myodaiji, Okazaki 444-8585, Japan.
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Shi X, Li L, Moriarty GM, Evans C, Findley G. Energy of the quasi-free electron in low density Ar and Kr: Extension of the local Wigner–Seitz model. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.01.060] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Crespo-Hernández CE, Arce R. Photoionization of DNA and RNA Bases, Nucleosides and Nucleotides Through a Combination of One- and Two-photon Pathways upon 266 nm Nanosecond Laser Excitation¶. Photochem Photobiol 2007. [DOI: 10.1562/0031-8655(2002)0760259podarb2.0.co2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Interaction of Charged Particles with Molecular Medium and Track Effects in Radiation Chemistry. ADVANCES IN CHEMICAL PHYSICS 2007. [DOI: 10.1002/9780470142967.ch3] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/25/2023]
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Crespo-Hernández CE, Arce R, Ishikawa Y, Gorb L, Leszczynski J, Close DM. Ab Initio Ionization Energy Thresholds of DNA and RNA Bases in Gas Phase and in Aqueous Solution. J Phys Chem A 2004. [DOI: 10.1021/jp049270k] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
| | | | | | | | | | - David M. Close
- Department of Physics, East Tennessee State University, Johnson City, Tennessee 37614
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Crespo-Hernández CE, Arce R. Photoionization of DNA and RNA bases, nucleosides and nucleotides through a combination of one- and two-photon pathways upon 266 nm nanosecond laser excitation. Photochem Photobiol 2002; 76:259-67. [PMID: 12403446 DOI: 10.1562/0031-8655(2002)076<0259:podarb>2.0.co;2] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The 266 nm nanosecond laser photolysis of various purine and pyrimidine derivatives results in their photoionization (PI) as one of the primary photochemical pathways. Electron photoejection occurs through a combination of one- and two-photon mechanisms. The PI values depend on the substituents attached to the chromophore of the base. The net PI of the purine bases at 266 nm are of the same order of magnitude (10(-2)) as those of the pyrimidine bases under similar experimental conditions. The monophotonic component is approximately one-third of the net PI yield of the bases. A nonrelaxed singlet excited state intermediate is tentatively proposed for this pathway. It is proposed that this state is significantly stabilized by water solvation, transforming it into a charge transfer to solvent state from which the hydrated electron evolves.
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Tajima S, Tobita S, Shizuka H. Electron Transfer Reaction from Triplet 1,4-Dimethoxybenzene to Hydronium Ion in Aqueous Solution. J Phys Chem A 1999. [DOI: 10.1021/jp990743a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- So Tajima
- Department of Chemistry, Gunma University, Kiryu, Gunma 376-8515, Japan
| | - Seiji Tobita
- Department of Chemistry, Gunma University, Kiryu, Gunma 376-8515, Japan
| | - Haruo Shizuka
- Department of Chemistry, Gunma University, Kiryu, Gunma 376-8515, Japan
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Al-Omari AK, Reininger R, Huber DL. Polarization energy distribution for impurity molecules in dense gases. J Chem Phys 1998. [DOI: 10.1063/1.477412] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Saito F, Tobita S, Shizuka H. Photoionization mechanism of aniline derivatives in aqueous solution studied by laser flash photolysis. J Photochem Photobiol A Chem 1997. [DOI: 10.1016/s1010-6030(97)00048-8] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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12
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Mixing of exciton-transfer and charge-transfer contributions to the wavefunction of the naphthalene-hexachlorobiphenyl exciplex. Chem Phys Lett 1997. [DOI: 10.1016/s0009-2614(97)00344-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Saitow KI, Naitoh Y, Tominaga K, Yoshihara K. Photo-induced reactions of CH2I2 in solution studied by the ultrafast transient absorption spectroscopy. Chem Phys Lett 1996. [DOI: 10.1016/s0009-2614(96)01116-5] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Al‐Omari AK, Altmann KN, Reininger R. Determination of the conduction band energy minimum in fluid argon by means of field ionization. J Chem Phys 1996. [DOI: 10.1063/1.471995] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Plenkiewicz B, Frongillo Y, Lopez‐Castillo J, Jay‐Gerin J. A simple but accurate ‘‘core‐tail’’ pseudopotential approach to the calculation of the conduction‐band energyV0of quasifree excess electrons and positrons in nonpolar fluids. J Chem Phys 1996. [DOI: 10.1063/1.471640] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Al‐Omari AK, Reininger R. Density dependence of the ionization potential of CH3I in argon and of the quasi‐free electron energy in argon. J Chem Phys 1995. [DOI: 10.1063/1.470136] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Katoh R, Lacmann K, Schmidt WF. Effect of high pressure on photoionization of N,N,N′,N′-tetramethyl-p-phenylenediamine (TMPD) in liquid 2,2-dimethylbutane (DMB). Chem Phys 1995. [DOI: 10.1016/0301-0104(95)00101-s] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Katoh R, Lacmann K, Schmidt WF. Polarization Energies of Molecular Cations in Alkane Solutions. ACTA ACUST UNITED AC 1995. [DOI: 10.1524/zpch.1995.190.part_2.193] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Al-Omari AK, Reininger R, Huber DL. Polarization Energy Distribution of a Positive Ion in Liquid Argon. PHYSICAL REVIEW LETTERS 1995; 74:820-823. [PMID: 10058856 DOI: 10.1103/physrevlett.74.820] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Meyer J, Reininger R. Electric-field ionization of high Rydberg states and vertical ionization potential of an impurity in dense fluid argon. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1993; 47:R3491-R3494. [PMID: 9909479 DOI: 10.1103/physreva.47.r3491] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Boltjes B, de Graaf C, de Leeuw SW. Computation of the energyV0of an excess electron in dense helium and argon. J Chem Phys 1993. [DOI: 10.1063/1.464601] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Lopez‐Castillo J, Frongillo Y, Plenkiewicz B, Jay‐Gerin J. Path‐integral molecular‐dynamics calculation of the conduction‐band energy minimum V0 of excess electrons in fluid argon. J Chem Phys 1992. [DOI: 10.1063/1.462218] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Stampfli P, Bennemann KH. Theoretical results for the density dependence of the electron affinity of nonpolar liquids Ar, Kr, and Xe. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 44:8210-8214. [PMID: 9905973 DOI: 10.1103/physreva.44.8210] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Plenkiewicz B, Plenkiewicz P, Jay-Gerin J. Density dependence of the conduction-band energy of excess electrons in liquid argon. PHYSICAL REVIEW. A, GENERAL PHYSICS 1989; 40:4113-4114. [PMID: 9902640 DOI: 10.1103/physreva.40.4113] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Corin AF, Gould IR. Photo-induced electron ejection from the reduced copper of Pseudomonas aeruginosa azurin. Photochem Photobiol 1989; 50:413-8. [PMID: 2506586 DOI: 10.1111/j.1751-1097.1989.tb04178.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The reduced form of Pseudomonas aeruginosa azurin exhibits an enhanced absorbance in the UV compared to that of the oxidized protein. This enhancement has also been observed for azurins from other bacterial species and for another type I copper protein, plastocyanin. Pulsed laser excitation of the reduced azurin in the region of enhanced absorbance at 308 nm results in single photon, rapid (less than 30 ns) oxidation of the copper center and formation of the hydrated electron with a quantum yield of 0.05. The hydrated electron reacts in the expected manner with scavengers such as nitrous oxide, oxygen, acetone and nitromethane. In the absence of scavengers, the electron reacts with the protein, including the disulfide bond, to form the disulfide radical anion, observed at 410 nm. The overall photophysical event involves a charge-transfer to solvent transition although the existence of intermediate states can not be excluded.
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Nakagawa K, Ejiri A, Itoh K, Nishikawa M. Photoconductivity threshold of supercritical xenon fluids doped with anthracene as a function of fluid density. Chem Phys Lett 1988. [DOI: 10.1016/0009-2614(88)80267-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Reininger R, Saile V, Laporte P, Steinberger I. Photoconduction in rare gas fluids doped by small organic molecules. Chem Phys 1984. [DOI: 10.1016/0301-0104(84)85072-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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28
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Reininger R, Steinberger I, Bernstorff S, Saile V, Laporte P. Extrinsic photoconductivity in xenon-doped fluid argon and krypton. Chem Phys 1984. [DOI: 10.1016/0301-0104(84)85166-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Nishikawa M, Holroyd RA. Electron attachment to oxygen in supercritical hydrocarbon fluids. J Chem Phys 1983. [DOI: 10.1063/1.446307] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Truong TB. Correlation between the photoelectron emission and photooxidation threshold energies of a solute in the condensed phase. Chem Phys Lett 1983. [DOI: 10.1016/0009-2614(83)87266-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Truong TB. Charge transfer to a solvent state. VIII. Localization of charge during the transition state of the solute: The solute cation localization energy. Chem Phys 1983. [DOI: 10.1016/0301-0104(83)85092-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Casanovas J, Grob R, Delacroix D, Guelfucci JP, Blanc D. Photoconductivity studies in some nonpolar liquids. J Chem Phys 1981. [DOI: 10.1063/1.442583] [Citation(s) in RCA: 76] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Truong TB. Charge transfer to a solvent state. VI. Inter‐relation between electrochemical and photoionization data of a solute in condensed phase. J Chem Phys 1981. [DOI: 10.1063/1.441460] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Grand D, Bernas A, Amouyal E. Photoionization of aqueous indole: Conduction band edge and energy gap in liquid water. Chem Phys 1979. [DOI: 10.1016/0301-0104(79)80064-6] [Citation(s) in RCA: 105] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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