Pulsed microwave irradiation effects on the dynamic behavior of a photochemically generated radical pair in a micellar solution

Sakaguchi, Yoshio; Astashkin, Andrei V.; Tadjikov, B.M.

doi:10.1016/s0009-2614(97)01189-5

Cited by 36 publications

(51 citation statements)

References 18 publications

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“…The broad one was explained by the acceleration of the intersystem crossing by MW radiation, and spin dephasing caused by the motion of the alkyl chain was proposed as the cause of the broadening. Sakaguchi et al [33,128,129] also reported an interesting ADMR work. In a micellar solution of 2-methyl-1,4-naphthoquinone they observed quanmm beats induced by a pulsed MW field by monitoring the yield of the escaping radical.…”

Section: Controlling Photochemical Reactionsmentioning

confidence: 89%

“…There are several different RYDMR methods such as fluorescence-detected magnetic resonance (FDMR) [30,31], transient-absorption-detected magnetic resonance (ADMR) [33,34] and recently developed PCDMR [37]. The observation of final reaction products of spin-trapped products constitutes a further RYDMR method [32].…”

Section: Controlling Photochemical Reactionsmentioning

confidence: 99%

“…The ADMR method is a way to observe the RP by monitoring the transient optical absorption of the RP itself and the free radicals formed through the RP [30,31,33,35] investigate the contributions of exchange and electron dipole-dipole interactions to RP systems. Maeda et al [35,127] studied the spin dynamics of a polymethylene-linked neutral biradical formed by the photoinduced intramolecular hydrogen abstraction of c~-(xanthone-2-carbonyloxy)-co-(xanthene-2-carbonyloxy) dodecane (XO-12-XHz) via the excited triplet state of the xanthone moiety.…”

Section: Controlling Photochemical Reactionsmentioning

confidence: 99%

“…Another important field of spin effects, namely, the reaction-yielddetected magnetic resonance (RYDMR) [30,31] started in Japan in 1986 with a remarkable work by Okazaki [32] and developed along with the above mentioned work in MFE, TREPR and pulsed EPR. Recent developments in this field enabled us to control the chemical reactions by microwave (MW) field [33][34][35] and to observe quantum beats [36]. A new RYDMR method known as photoconductivity-detected magnetic resonance (PCDMR) was also developed [37].…”

Section: Introductionmentioning

confidence: 99%

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Developments of magnetic-resonance-related spin chemistry in Japan

et al. 2003

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Abstraet. A review on the developments of the magnetic-resonance-related spin chemistry in Japan is presented. We describe how studies in this atea started in Japan and developed into the flourishing state of the present. Important contributions made by Japanese spin chemists in the last two decades in three areas, namely, work on chemically induced dynamic electron polarization, excited states and controlling of photochemical reactions, are presented. More emphases are placed on the new deveIopments in recent years, particularty new concepts and new methodologies.

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Section: Controlling Photochemical Reactionsmentioning

confidence: 89%

Section: Controlling Photochemical Reactionsmentioning

confidence: 99%

Section: Controlling Photochemical Reactionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Developments of magnetic-resonance-related spin chemistry in Japan

et al. 2003

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“…Our apparatus is specifically designed to observe reaction dynamics [9]. Reactions are initiated by laser irradiation in the presence of a magnetic field, and aftera certain, well-defined delay time, the system is irradiated with a short microwave pulse.…”

Section: Introductionmentioning

confidence: 99%

Pulse-shift measurement: a direct observation of radical pair dynamics in a micelle

Sakaguchi

Woodward

2003

Appl. Magn. Reson.

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Abstraet. The hydrogen abstraction reactions of benzophenone in a micellar solution in the absence and presente of 1,4-cyclohexadiene are compared with time-resolved electron spin resonance (ESR) and optically detected (OD) ESR. "Pulse shift" measurement by OD-ESR, which observes the effect of a resonant microwave pulse at different delay times after laser excitation, reveals that the lifetime of the radical pair becomes much shorter in the presence of 1,4-cyclohexadiene. This explains the change of chemically induced dynamic electron polarization from spin-correlated radical pair polarization in the absence of 1,4-cyclohexadiene to conventional E'/A polarization in its presence. The rate constants determined by this technique indicate that the escaping rate of cyclohexadienyl radical is ten times Iarger than those of alkyI and benzophenone ketyl radicals.

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Radical pair dynamics in anionic micelles with different alkyl chain length as studied by pulse-mode product-yield-detected ESR

Konishi

Okazaki

1999

Appl. Magn. Reson.

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Pulsed microwave irradiation effects on the dynamic behavior of a photochemically generated radical pair in a micellar solution

Cited by 36 publications

References 18 publications

Developments of magnetic-resonance-related spin chemistry in Japan

Developments of magnetic-resonance-related spin chemistry in Japan

Pulse-shift measurement: a direct observation of radical pair dynamics in a micelle

Radical pair dynamics in anionic micelles with different alkyl chain length as studied by pulse-mode product-yield-detected ESR

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