Magnetic field effects on the fluorescence of intramolecular electron-donor-acceptor systems

Tanimoto, Yoshifumi; Okada, Nobuhiro; Itoh, Michiya; Iwai, Kaoru; Sugioka, K.; Takemura, Fukuo; Nakagaki, Ryoichi; Nagakura, Saburo

doi:10.1016/0009-2614(87)87295-0

Cited by 52 publications

(27 citation statements)

References 14 publications

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“…1 [4]. After the acceptor molecule Ph is excited, the electron transfer from DMA to 1ph* (the excited singlet state of Ph) generates both the singlet state of biradical and the exciplex.…”

Section: Resultsmentioning

confidence: 99%

“…After the acceptor molecule Ph is excited, the electron transfer from DMA to 1ph* (the excited singlet state of Ph) generates both the singlet state of biradical and the exciplex. The singlet biradical and the exciplex are considered to be in equilibriurn [4]. The triplet biradical is created by the hyperfine-coupling-induced spin conversion (intersystem crossing, ISC).…”

Section: Resultsmentioning

confidence: 99%

“…2-[4-(Dimethylamino)phenyl]ethyl 10-(9-phenanthryl)decyl ether (abbreviated hereafter "linked system") was prepared by Tanimoto et al [4]. Phenanthrene (Ph) was recrystallized from ethanol.…”

Section: Methodsmentioning

confidence: 99%

“…In the case of the neutral biradical (initial spin multiplicity is unreactive triplet), it decays only by the recombination reaction of the singlet state converted through a spin realignment in the biradical. On the other hand, the ionic biradical generated from the polymethylene-linked donor-acceptor system, A-(CH)n-D, [3,4] recombines from both its singlet (initial spin state) and triplet manifolds. For the last two decades the extemal magnetic field effects upon there combination reaction of the ionic biradical have been investigated extensively by Weller, Steark et aL and Tanimoto et al [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Reaction-yield-detected magnetic resonance in the intra-and intermolecular electron transfer reactions

et al. 1997

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The spin dynamics of the intermediate radical ion pairs formed in the intra-and intermolecular electron transfer reactions between N,N-dimethylaniline and phenanthrene is studied by employing the polymethylene-linked and nonlinked systems. Reaetion-yield-detected magnetic resonance (RYDMR) expe¡ are performed by monitoring the exciplex fluorescente. From the theoretical consideration of the data, we conelude that the lifetime of the radical ion pair in the linked system is shorter than that in the nonlinked system. This tendency is opposite to what is generally observed in linked and nonlinked neutral biradical.

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“…1 [4]. After the acceptor molecule Ph is excited, the electron transfer from DMA to 1ph* (the excited singlet state of Ph) generates both the singlet state of biradical and the exciplex.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reaction-yield-detected magnetic resonance in the intra-and intermolecular electron transfer reactions

et al. 1997

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“…For our present system the MFE is about 10%. Attaching the donor and acceptor by a methylene chain dramatically increases the MFE, which reaches 47% for linked pyrene and DMA [12][13][14].…”

Section: Discussionmentioning

confidence: 99%

Optical imaging through scattering media via magnetically modulated fluorescence

Yang

Cohen

2010

Opt. Express

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A weak (< 1000 G) magnetic field can influence photochemical processes through its effect on electron spin dynamics in a photogenerated radical pair. In a solution of pyrene and dimethylaniline this effect manifests as magnetic field-dependent exciplex fluorescence. Here we describe magnetofluorescence imaging (MFI). A localized magnetic null defines a fluorescence detection volume, which is scanned through a sample to create an image. MFI forms an image without lenses and in the presence of arbitrarily strong optical scattering. The resolution of MFI is in principle not limited by optical diffraction, although the present implementation is far from the diffraction limit.

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Magnetic field effects upon photochemistry of bifuctional chain molecules

Nakagaki¹,

Tanimoto²,

Mutai³

1993

J of Physical Organic Chem

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External magnetic field effects are discussed for three typical examples of photoreactions involving biradical intermediates: photo-induced intramolecular electron transfer in chain molecules D-(CH*),-A consisting of an electron donor (D) and an acceptor (A), intramolecular hydrogen abstraction in bifunctional species :X-(CH2).-YH containing a hydrogen donor (YH) and an acceptor (:X in the excited triplet state) andphotochemical homolytic ring opening of a cyclic ketone which yields a biradical consisting of an acyl and an alkyl group. There has been progress in the elucidation of reaction mechanisms through the analysis of magnetic field effects on lifetimes of reaction intermediates and product yields in radical reactions involving biradicals. Extremely small interactions such as the Zeeman energy and hyperfine interaction may give rise to a large change in the distribution of photo-products derived from bifunctional chain molecules.

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Magnetic field effects on the fluorescence of intramolecular electron-donor-acceptor systems

Cited by 52 publications

References 14 publications

Reaction-yield-detected magnetic resonance in the intra-and intermolecular electron transfer reactions

Reaction-yield-detected magnetic resonance in the intra-and intermolecular electron transfer reactions

Optical imaging through scattering media via magnetically modulated fluorescence

Magnetic field effects upon photochemistry of bifuctional chain molecules

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