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

Chikashi Nakanishi; Saori Ikeda; Tetsuhiko Isobe; Mamoru Senna

doi:10.1016/S0025-5408(02)00698-0

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

Chikashi Nakanishi, Saori Ikeda, Tetsuhiko Isobe, Mamoru Senna

Department of Applied Chemistry

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	647-651
Number of pages	5
Journal	Materials Research Bulletin
Volume	37
Issue number	4
DOIs	https://doi.org/10.1016/S0025-5408(02)00698-0
Publication status	Published - 2002 Mar 25

Keywords

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

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1016/S0025-5408(02)00698-0

Cite this

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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",

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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

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