Application of the zone melting technique to metal chelate systems-II Concentration of a trace amount of metal acetylacetonate in chromium(III) acetylacetonate.
The zone melting process was applied to tris(acetylacetonato) chromium(III) which contained a trace amount of aluminium(III), iron(III), copper(II), manganese(III), nickel(II) cobalt(III) and rhodium(III) in the forms of their acetylacetonates, and the highly purified chromium chelate was found in the top portion of a column, while the minor components except the rhodium chelate were concentrated in the bottom portion. The rhodium chelate was concentrated in the top portion. Ease of migration of the minor components during the zone melting process decreased in the order Cu, Fe, Mn, Co, Ni, Al and Rh, and was accounted for in terms of their crystal structures. Extremely slow speed of zone travel caused an increase of the distribution coefficient; this was due to back diffusion of minor components into a congealed solid phase from a molten zone.
Kaneko
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Department of Organic Synthesis, Faculty of Engineering, Kyushu University, Fukuoka, Japan; Present address: Mitzui Petrochemical Industries, Ltd., Iwakuni-Otake Works, Research and Development Department, Iwakuni-shi, Japan.
Kobayashi
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Ueno
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