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Cobalt violet : ウィキペディア英語版 | Cobalt phosphate
Cobalt phosphate is the inorganic compound with the formula Co3(PO4)2. It is a commercial inorganic pigment known as cobalt violet.〔Hugo Müller, Wolfgang Müller, Manfred Wehner, Heike Liewald "Artists' Colors" in Ullmann's Encyclopedia of Industrial Chemistry 2002, Wiley-VCH, Weinheim. 〕 Thin films of this material catalyze the oxidation of water.〔 Matthew W. Kanan, Yogesh Surendranatha, Daniel G. Nocera "Cobalt–phosphate oxygen-evolving compound" Chem. Soc. Rev., 2009, volume 38, 109-114. 〕 : ==Preparation and structure== It precipitates as a solid tetrahydrate upon mixing aquous solutions of cobalt(II) and phosphate salts. The anhydrous material consists of discrete phosphate (PO43−) anions that link Co2+ centres. The cobalt ions occupy both octahedral (six-coordinate) and pentacoordinate sites in a 1:2 ratio.〔Anderson, J. B.; Kostiner, E.; Miller, M. C.; Rea, J. R. "Crystal structure of cobalt orthophosphate Co3(PO4)2" Journal of Solid State Chemistry 1975, vol. 14, 372-7.〕
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