Silica-[Fe(bpy)3]2+ composite particles with photo-responsive change of color and magnetic property

Chikashi Nakanishi, Saori Ikeda, Tetsuhiko Isobe, Mamoru Senna

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Photo-induced complex formation of tris-2,2′-bipyridine iron(II) complex ([Fe(bpy)3]2+) from the mixture of FeCl3 and 2,2′-bipyridine was achieved in silica gel containing 150-300 μm silica particles, derived from a complex emulsion with HCl aqueous solution and tetraethyl orthosilicate (TEOS). More than 95% of Fe(III) and 2,2′-bipyridine were incorporated in silica particles. Yellow-red color change, due to [Fe(bpy)3]2+, was observed by irradiation with 365 nm UV beam at 0.3 mW cm-2 for 120 s. The complex formation accompanies simultaneous spin transition from the high-spin state of Fe(III) to the low-spin state of Fe(II).

Original languageEnglish
Pages (from-to)647-651
Number of pages5
JournalMaterials Research Bulletin
Issue number4
Publication statusPublished - 2002 Mar 25


  • A. Amorphous materials
  • A. Composites
  • B. Sol-gel chemistry
  • D. Color centers
  • D. Magnetic properties

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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