Metastable photoinduced phase of Cu(II) ethylenediamine complexes studied by x-ray-absorption fine-structure spectroscopy

Toshihiko Yokoyama, Kazuyuki Takahashi, Osamu Sato

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Photoinduced phase transition of (formula presented) (formula presented)-diethylethlenediamine, (formula presented) and (formula presented) has been investigated by means of x-ray-absorption fine structure spectroscopy. Upon UV-light (formula presented) irradiation at 30 K, the materials undergo a photoinduced structural transition. Cu K-edge x-ray-absorption near-edge structure spectra have clarified that the initially planar (formula presented) unit is distorted tetrahedrally. Although the structural change within the first nearest neighbors around Cu is similar to that in the thermally driven transition (the high-temperature phase), the configuration of the surrounding ethyl and ethylene groups in the photoinduced phase was found to resemble that of the low-temperature phase rather than that of the high-temperature one. Namely, no noticeable reconstruction of ethyl groups takes place, which occurs in thermally activated transition. The photoinduced state is conclusively regarded as a new metastable state that is structurally not equivalent either to the high- or low-temperature phases.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume67
Issue number17
DOIs
Publication statusPublished - May 28 2003
Externally publishedYes

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ethylenediamine
Metastable phases
x ray absorption
fine structure
Spectroscopy
X rays
spectroscopy
Temperature
Ultraviolet radiation
Ethylene
Phase transitions
Irradiation

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Metastable photoinduced phase of Cu(II) ethylenediamine complexes studied by x-ray-absorption fine-structure spectroscopy. / Yokoyama, Toshihiko; Takahashi, Kazuyuki; Sato, Osamu.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 67, No. 17, 28.05.2003.

Research output: Contribution to journalArticle

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AB - Photoinduced phase transition of (formula presented) (formula presented)-diethylethlenediamine, (formula presented) and (formula presented) has been investigated by means of x-ray-absorption fine structure spectroscopy. Upon UV-light (formula presented) irradiation at 30 K, the materials undergo a photoinduced structural transition. Cu K-edge x-ray-absorption near-edge structure spectra have clarified that the initially planar (formula presented) unit is distorted tetrahedrally. Although the structural change within the first nearest neighbors around Cu is similar to that in the thermally driven transition (the high-temperature phase), the configuration of the surrounding ethyl and ethylene groups in the photoinduced phase was found to resemble that of the low-temperature phase rather than that of the high-temperature one. Namely, no noticeable reconstruction of ethyl groups takes place, which occurs in thermally activated transition. The photoinduced state is conclusively regarded as a new metastable state that is structurally not equivalent either to the high- or low-temperature phases.

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