Spin Polarization Conservation during Intramolecular Triplet-Triplet Energy Transfer Studied by Time-Resolved EPR Spectroscopy

Kimio Akiyama; Shozo Tero-Kubota; Tadaaki Ikoma; Yusaku Ikegami

doi:10.1021/ja00091a042

Spin Polarization Conservation during Intramolecular Triplet-Triplet Energy Transfer Studied by Time-Resolved EPR Spectroscopy

Kimio Akiyama, Shozo Tero-Kubota, Tadaaki Ikoma, Yusaku Ikegami

Division of Organic- and Biomaterials Research

Research output: Contribution to journal › Article › peer-review

44 Citations (Scopus)

Abstract

Transient triplet EPR spectra of two types of spirans, spiro[9,10-dihydro-9-oxoanthracene-10,2'-benz[f]-indan] and spiro[9,10-dihydro-9-oxoanthracene-10,2'-3H-phenalene], were measured in a glassy matrix at 77 K. Spin polarization conservation during the intramolecular triplet-triplet energy-transfer process was observed. The results clearly indicate that spin orientation is conserved in the molecular frame in the presence of an external magnetic field and that the high-field approximation cannot explain the spin polarization pattern observed in the X-band EPR spectra. The results contribute to the understanding of the relaxation processes of the excited states.

Original language	English
Pages (from-to)	5324-5327
Number of pages	4
Journal	Journal of the American Chemical Society
Volume	116
Issue number	12
DOIs	https://doi.org/10.1021/ja00091a042
Publication status	Published - 1994 Jun 1

ASJC Scopus subject areas

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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title = "Spin Polarization Conservation during Intramolecular Triplet-Triplet Energy Transfer Studied by Time-Resolved EPR Spectroscopy",

abstract = "Transient triplet EPR spectra of two types of spirans, spiro[9,10-dihydro-9-oxoanthracene-10,2'-benz[f]-indan] and spiro[9,10-dihydro-9-oxoanthracene-10,2'-3H-phenalene], were measured in a glassy matrix at 77 K. Spin polarization conservation during the intramolecular triplet-triplet energy-transfer process was observed. The results clearly indicate that spin orientation is conserved in the molecular frame in the presence of an external magnetic field and that the high-field approximation cannot explain the spin polarization pattern observed in the X-band EPR spectra. The results contribute to the understanding of the relaxation processes of the excited states.",

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T1 - Spin Polarization Conservation during Intramolecular Triplet-Triplet Energy Transfer Studied by Time-Resolved EPR Spectroscopy

AU - Akiyama, Kimio

AU - Tero-Kubota, Shozo

AU - Ikoma, Tadaaki

AU - Ikegami, Yusaku

PY - 1994/6/1

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N2 - Transient triplet EPR spectra of two types of spirans, spiro[9,10-dihydro-9-oxoanthracene-10,2'-benz[f]-indan] and spiro[9,10-dihydro-9-oxoanthracene-10,2'-3H-phenalene], were measured in a glassy matrix at 77 K. Spin polarization conservation during the intramolecular triplet-triplet energy-transfer process was observed. The results clearly indicate that spin orientation is conserved in the molecular frame in the presence of an external magnetic field and that the high-field approximation cannot explain the spin polarization pattern observed in the X-band EPR spectra. The results contribute to the understanding of the relaxation processes of the excited states.

AB - Transient triplet EPR spectra of two types of spirans, spiro[9,10-dihydro-9-oxoanthracene-10,2'-benz[f]-indan] and spiro[9,10-dihydro-9-oxoanthracene-10,2'-3H-phenalene], were measured in a glassy matrix at 77 K. Spin polarization conservation during the intramolecular triplet-triplet energy-transfer process was observed. The results clearly indicate that spin orientation is conserved in the molecular frame in the presence of an external magnetic field and that the high-field approximation cannot explain the spin polarization pattern observed in the X-band EPR spectra. The results contribute to the understanding of the relaxation processes of the excited states.

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Spin Polarization Conservation during Intramolecular Triplet-Triplet Energy Transfer Studied by Time-Resolved EPR Spectroscopy

Abstract

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