Study on Photo-induced Charge Transfer Phase Transition by Means of Moessbauer Spectroscopy

• KOJIMA Norimichi

  Graduate School of Arts and Sciences, The University of Tokyo

• KIDA Noriyuki

  Graduate School of Arts and Sciences, The University of Tokyo

• ENOMOTO Masaya

  Graduate School of Arts and Sciences, The University of Tokyo

Bibliographic Information

Other Title

• メスバウアー分光による光誘起電荷移動相転移の研究
• メスバウアー ブンコウ ニ ヨル ヒカリ ユウキ デンカ イドウ ソウ テンイ ノ ケンキュウ

Abstract

In the case of mixed-valence system whose spin states are situated in the spin crossover region, new types of conjugated phenomena coupled with spin and charge are expected. From this viewpoint, we have investigated the multifunctional properties coupled with spin, charge and photon for the organic-inorganic hybrid system, A[Fe^IIFe^III(dto)₃] (A = (n-C_nH_2n+1)₄N, spiropyran; dto = C₂O₂S₂) by means of the magnetic susceptibility and ⁵⁷Fe Mössbauer spectroscopy. In (n-C_nH_2n+1)₄N[Fe^IIFe^III(dto)₃], in addition to the ferromagnetic transition, a new type of phase transition called charge transfer phase transition (CTPT) takes place around 120 K, where the thermally induced charge transfer between Fe^II and Fe^III occurs reversibly. The charge transfer phase transition and the ferromagnetic transition for (n-C_nH_2n+1)₄N[Fe^IIFe^III(dto)₃] remarkably depend on the size of intercalated cation. In the case of (SP) [Fe^IIFe^III(dto)₃] (SP = spiropyran), the photoinduced isomerization of SP under UV irradiation induces the charge transfer phase transition in the [Fe^IIFe^III(dto)₃] layer and the remarkable change of the ferromagnetic transition temperature.

Journal

• Hyomen Kagaku

  Hyomen Kagaku 31 (5), 237-243, 2010

  The Surface Science Society of Japan

Keywords

• charge transfer phase transition
• mixed-valence complex
• photo-isomerization
• ferromagnetism
• organic-inorganic hybrid system

Details

• CRID: 1390282681433673600
• NII Article ID: 10026319897
• NII Book ID: AN00334149
• DOI: 10.1380/jsssj.31.237
• ISSN: 18814743
• ISSN: 03885321
• NDL BIB ID: 10699256
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10699256
• Web Site: http://www.jstage.jst.go.jp/article/jsssj/31/5/31_5_237/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed