Novel Co complex with high transformation temperature of valence tautomerism

Aili Cui, Kazuyuki Takahashi, Akira Fujishima, Osamu Sato

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


The preparation and characterization of [CoII-HS(dpa) (3,5-DBSQ)2] are presented first time. From the magnetic curve, the phase transition temperatures, Tc is 380 K. To our knowledge, the Tc value is the highest among the species exhibiting thermal valence tautomerism. After illumination with 532 nm light at 5 K, the magnetization values increase from μeff=1.73 to 2.0 μ B, showing valence tautomerism. The metastable state will recover to the original state with the increase of temperature. The alternate illumination with 532 and 830 nm light at 5 K can induce a reversible change in magnetization. The quick response to light means that this compound can be used for the development of optical-magnetic switch.

Original languageEnglish
Pages (from-to)243-246
Number of pages4
JournalJournal of Photochemistry and Photobiology A: Chemistry
Issue number2-3
Publication statusPublished - Jan 30 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)


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