Study on spin configuration in photoresponsive iron mixed-valence complexes by Mössbauer spectroscopy

A. Okazawa, J. Yoshida, N. Kida, I. Kashima, W. Murata, M. Enomoto, N. Kojima*

*この研究の対応する著者

研究成果: Article査読

1 被引用数 (Scopus)

抄録

We have investigated magnetic properties in a series of photoresponsive dithiooxalato (dto)-bridged iron mixed-valence complexes, (SP-R)[FeIIFeIII(dto)3] (SP-R = R-substituted pyridospiropyran cation; R = Me, Et, and Pr; abbreviated as 1 Me, 1 Et, and 1 Pr, respectively). As for our previous reports, 1 Me and 1 Et show two-step succeeding ferromagnetic transitions at T C = 25 & 8 K and 22 & 5 K, respectively. However, 1 Et has no hysteresis in the magnetic susceptibility, while 1 Me undergoes the charge transfer phase transition with thermal hysteresis around 75 K. To elucidate the two-step transitions of them, we measured 57Fe Mössbauer spectra of 1 Et. The spectra of FeII (S = 2) and FeIII (S = 1/2) in the HTP were observed in the magnetically ordered state as well as the paramagnetic state, and revealed that only HTP exists in a temperature range up to 5 K. The result is consistent with that of 1 Pr, where one ferromagnetic phase transition occurs at T C = 10 K. 57Fe Mössbauer spectroscopy is useful to clarify the origin of the succeeding magnetic transition for these systems.

本文言語English
ページ(範囲)351-357
ページ数7
ジャーナルHyperfine Interactions
226
1-3
DOI
出版ステータスPublished - 2014 4月
外部発表はい

ASJC Scopus subject areas

  • 原子分子物理学および光学
  • 核物理学および高エネルギー物理学
  • 凝縮系物理学
  • 物理化学および理論化学

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