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
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U2 - 10.1016/S0025-5408(02)00698-0
DO - 10.1016/S0025-5408(02)00698-0
M3 - Article
AN - SCOPUS:0037171064
SN - 0025-5408
VL - 37
SP - 647
EP - 651
JO - Materials Research Bulletin
JF - Materials Research Bulletin
IS - 4
ER -