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 journalArticle

4 Citations (Scopus)

Abstract

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
Volume37
Issue number4
DOIs
Publication statusPublished - 2002 Mar 25

Fingerprint

Silicon Dioxide
Magnetic properties
Iron
Silica
silicon dioxide
magnetic properties
Color
color
composite materials
Silica Gel
Composite materials
Silica gel
Emulsions
iron
tetraethyl orthosilicate
Irradiation
silica gel
emulsions
aqueous solutions
irradiation

Keywords

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

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Silica-[Fe(bpy)3]2+ composite particles with photo-responsive change of color and magnetic property. / Nakanishi, Chikashi; Ikeda, Saori; Isobe, Tetsuhiko; Senna, Mamoru.

In: Materials Research Bulletin, Vol. 37, No. 4, 25.03.2002, p. 647-651.

Research output: Contribution to journalArticle

Nakanishi, Chikashi ; Ikeda, Saori ; Isobe, Tetsuhiko ; Senna, Mamoru. / Silica-[Fe(bpy)3]2+ composite particles with photo-responsive change of color and magnetic property. In: Materials Research Bulletin. 2002 ; Vol. 37, No. 4. pp. 647-651.
@article{edf103c5d3864d0aace6261c6f9b23ff,
title = "Silica-[Fe(bpy)3]2+ composite particles with photo-responsive change of color and magnetic property",
abstract = "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).",
keywords = "A. Amorphous materials, A. Composites, B. Sol-gel chemistry, D. Color centers, D. Magnetic properties",
author = "Chikashi Nakanishi and Saori Ikeda and Tetsuhiko Isobe and Mamoru Senna",
year = "2002",
month = "3",
day = "25",
doi = "10.1016/S0025-5408(02)00698-0",
language = "English",
volume = "37",
pages = "647--651",
journal = "Materials Research Bulletin",
issn = "0025-5408",
publisher = "Elsevier Limited",
number = "4",

}

TY - JOUR

T1 - Silica-[Fe(bpy)3]2+ composite particles with photo-responsive change of color and magnetic property

AU - Nakanishi, Chikashi

AU - Ikeda, Saori

AU - Isobe, Tetsuhiko

AU - Senna, Mamoru

PY - 2002/3/25

Y1 - 2002/3/25

N2 - 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).

AB - 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).

KW - A. Amorphous materials

KW - A. Composites

KW - B. Sol-gel chemistry

KW - D. Color centers

KW - D. Magnetic properties

UR - http://www.scopus.com/inward/record.url?scp=0037171064&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037171064&partnerID=8YFLogxK

U2 - 10.1016/S0025-5408(02)00698-0

DO - 10.1016/S0025-5408(02)00698-0

M3 - Article

VL - 37

SP - 647

EP - 651

JO - Materials Research Bulletin

JF - Materials Research Bulletin

SN - 0025-5408

IS - 4

ER -