Synthesis of picolinate-iron(III) compounds through an aqueous solution process

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  • SATO Junki
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • KOBAYASHI Makoto
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • KATO Hideki
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • KWON Eunsang
    Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University
  • KAKIHANA Masato
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

Bibliographic Information

Published
2015
DOI
  • 10.2109/jcersj2.123.751
Publisher
The Ceramic Society of Japan

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Description

A novel picolinate-iron(III) compound, Fe(C6H4NO2)2(OH) (1), was synthesized from an aqueous solution of a picolinate-iron(II) complex. Compound 1 was obtained by a thermal treatment of the picolinate-iron complex aqueous solution, whose pH was adjusted to 3–7, containing more than twice molar picolinic acid (Hpa) to Fe at 353 K for 72 h. When the iron aqueous solution in the presence of more than six times molar Hpa to Fe at pH 2–5 was heated, Fe(C6H4NO2)3·H2O (2) appeared. Millimeter-sized yellow-green single crystals of 2 could be obtained by the heat treatment of the picolinate-iron aqueous solution, whose pH was adjusted to 3, with Fe2+:Hpa = 1:10 at 373 K for 72 h. Formation mechanism of 1 and 2 was also discussed through investigations of relationship between synthesis conditions and products. Our approach opens a promising new route for preparation of precursors for synthesis of high functional ceramics and development of new organic–inorganic hybrids.

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