Photo-induced magnetized state of Co(DTBSQ)(DTBCat)(phen) · C6H5CH3 studied by X-ray absorption spectroscopy

Toshihiko Yokoyama, Kaoru Okamoto, Kensuke Nagai, Toshiaki Ohta, Shinya Hayami, Zhong Ze Gu, Rie Nakajima, Osamu Sato

Research output: Contribution to journalArticle

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Abstract

A photo-induced magnetized state of Co(DTBSQ)(DTBCat)(phen)· C6H5CH3 (DTBSQ=3,5-di-tert-butyl-semiquinone, DTBCat=3,5-di-tert-butyl-catechol and phen=1,10-phenanthroline) was investigated by Co K-edge X-ray absorption fine structure (XAFS) spectroscopy. In the present experimental setup, about 65% Co is found to stay in the trapped excited state at 11 K during visible-light (532 nm) irradiation. It is revealed from the X-ray absorption near-edge structure (XANES) spectra that the Co electronic structure of the state is essentially identical to that of the high-temperature (HT) phase. Upon irradiation, one electron in DTBCat2- is transferred to low-spin (LS) Co(III), yielding high-spin (HS) Co(II) and DTBSQ-. Extended X-ray absorption fine structure (EXAFS) analysis provides information on the first-nearest neighbor N and O distances; the irradiated sample shows the average Co-N,O distance of 1.95±0.04 Å, which lies between those of low-temperature (1.899±0.011 Å) and HT (2.081±0.021 Å) phases, this being consistent with the XANES results.

Original languageEnglish
Pages (from-to)272-276
Number of pages5
JournalChemical Physics Letters
Volume345
Issue number3-4
DOIs
Publication statusPublished - Sep 14 2001

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X ray absorption spectroscopy
X ray absorption
absorption spectroscopy
X ray absorption fine structure spectroscopy
Irradiation
Information analysis
x rays
fine structure
information analysis
Excited states
Temperature
irradiation
Electronic structure
guy wires
Electrons
electronic structure
spectroscopy
excitation
electrons

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Photo-induced magnetized state of Co(DTBSQ)(DTBCat)(phen) · C6H5CH3 studied by X-ray absorption spectroscopy. / Yokoyama, Toshihiko; Okamoto, Kaoru; Nagai, Kensuke; Ohta, Toshiaki; Hayami, Shinya; Gu, Zhong Ze; Nakajima, Rie; Sato, Osamu.

In: Chemical Physics Letters, Vol. 345, No. 3-4, 14.09.2001, p. 272-276.

Research output: Contribution to journalArticle

Yokoyama, Toshihiko ; Okamoto, Kaoru ; Nagai, Kensuke ; Ohta, Toshiaki ; Hayami, Shinya ; Gu, Zhong Ze ; Nakajima, Rie ; Sato, Osamu. / Photo-induced magnetized state of Co(DTBSQ)(DTBCat)(phen) · C6H5CH3 studied by X-ray absorption spectroscopy. In: Chemical Physics Letters. 2001 ; Vol. 345, No. 3-4. pp. 272-276.
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