Effect of Oxygen on the Formation and Decay of Stilbene Radical Cation during the Resonant Two-Photon Ionization

Michihiro Hara; Shingo Samori; Cai Xichen; Mamoru Fujitsuka; Tetsuro Majima

doi:10.1021/jo050317n

Effect of Oxygen on the Formation and Decay of Stilbene Radical Cation during the Resonant Two-Photon Ionization

The Journal of Organic Chemistry ◽

10.1021/jo050317n ◽

2005 ◽

Vol 70 (11) ◽

pp. 4370-4374 ◽

Cited By ~ 9

Author(s):

Michihiro Hara ◽

Shingo Samori ◽

Cai Xichen ◽

Mamoru Fujitsuka ◽

Tetsuro Majima

Keyword(s):

Radical Cation ◽

Two Photon ◽

Photon Ionization ◽

Effect Of Oxygen

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Important factors for the formation of radical cation of stilbene and substituted stilbenes during resonant two-photon ionization with a 266- or 355-nm laser

Journal of Photochemistry and Photobiology A Chemistry ◽

10.1016/j.jphotochem.2005.08.005 ◽

2006 ◽

Vol 179 (1-2) ◽

pp. 115-124 ◽

Cited By ~ 14

Author(s):

Shingo Samori ◽

Michihiro Hara ◽

Sachiko Tojo ◽

Mamoru Fujitsuka ◽

Tetsuro Majima

Keyword(s):

Radical Cation ◽

Two Photon ◽

Photon Ionization

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Relationship between formation yield of radical cation and laser intensity during resonant two-photon ionization of stilbene and methoxyl-substituted stilbenes using a 25-ns XeCl excimer laser

Chemical Physics Letters ◽

10.1016/j.cplett.2004.06.022 ◽

2004 ◽

Vol 393 (4-6) ◽

pp. 338-342 ◽

Cited By ~ 3

Author(s):

Michihiro Hara ◽

Sachiko Tojo ◽

Mamoru Fujitsuka ◽

Tetsuro Majima

Keyword(s):

Excimer Laser ◽

Radical Cation ◽

Laser Intensity ◽

Two Photon ◽

Photon Ionization ◽

Xecl Excimer Laser

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Resonant two-photon ionization of phenol in methylene chloride doped solid argon using 248 nm KrF laser and 254 nm Hg lamp radiation, a comparative study. The UV/VIS absorption spectrum of phenol radical cation

Chemical Physics ◽

10.1016/0301-0104(91)80064-o ◽

1991 ◽

Vol 153 (3) ◽

pp. 511-517 ◽

Cited By ~ 16

Author(s):

Karl Kesper ◽

Frank Diehl ◽

Jens Georg Günther Simon ◽

Harald Specht ◽

Armin Schweig

Keyword(s):

Absorption Spectrum ◽

Comparative Study ◽

Radical Cation ◽

Methylene Chloride ◽

Two Photon ◽

Krf Laser ◽

Photon Ionization ◽

Solid Argon

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Formation and decay of pyrene radical cation and pyrene dimer radical cation in the absence and presence of cyclodextrins during resonant two-photon ionization of pyrene and sodium 1-pyrene sulfonate

Physical Chemistry Chemical Physics ◽

10.1039/b403409k ◽

2004 ◽

Vol 6 (13) ◽

pp. 3215-3220 ◽

Cited By ~ 21

Author(s):

Michihiro Hara ◽

Sachiko Tojo ◽

Kiyohiko Kawai ◽

Tetsuro Majima

Keyword(s):

Radical Cation ◽

Two Photon ◽

Photon Ionization ◽

Dimer Radical Cation

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Photosensitized Reaction of Poly(L-lactic Acid) via Two-Photon Ionization of Dopant

MRS Proceedings ◽

10.1557/proc-708-bb3.9 ◽

2001 ◽

Vol 708 ◽

Cited By ~ 1

Author(s):

Wataru Sakai ◽

Kosuke Wakabayashi ◽

Hiroshi Nishinaka ◽

Hiroki Kawamoto ◽

Motoi Kinoshita ◽

...

Keyword(s):

Lactic Acid ◽

Molecular Orbital ◽

Radical Cation ◽

Main Chain ◽

Molecular Orbital Calculation ◽

Broad Absorption Band ◽

Two Photon ◽

Esr Spectrum ◽

Photon Ionization ◽

Semiempirical Molecular Orbital

ABSTRACTWe here studied photosensitized radical reaction of poly(L-lactic acid) (PLA) using spectrophotometry, electron spin resonance (ESR), gel permeation chromatography (GPC) measurements, and semiempirical molecular orbital calculation. PLA doped with N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD) was irradiated at 77 K using UV light. After the irradiation, we observed a new broad absorption band that is assigned to TMPD radical cation produced by two-photon ionization. ESR spectrum of the irradiated sample also indicated presence of main chain scission radical of PLA as well as the TMPD radical cation. By increasing the irradiation time, the ESR spectrum changed by another radical species which is produced by dehydrogenation of PLA main chain. Spectral simulation for the obtained ESR spectra revealed changes of relative amounts. The GPC measurements clearly indicated decrease in molecular weight of PLA after the irradiation. The semiempirical molecular orbital calculation was used to confirm the reaction scheme of radical anion decomposition.

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