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Precursor Trichloroethanoato-Chromium (III) Species in the Formation of Tris (2,4-Pentanedionato) Chromium(Iii)

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Two precursor species have been identified as responsible for the catalyzing effect of the trichloroethanoate (TCE) anion on the formation of tris(2,4-pentanedionato) chromium (III), Cr(acac)3. The first one is the green intermediate species (GIS) identified as tetrahydroxodecakisμ5-trichloroethanoato-trichloroethanoato-teiraaquopentachromium(III), Cr5 (OH)4 (CCl3 COO)11 (H2)4. This appears to be the first pentanuclear species reported among the polynuclear alkanoato metal complexes. It reacts at a rapid rate with the 2,4-pentanedionate, acac, anion to produce a second precursor, the violet-green intermediate species (VGIS) identified as bis(2,4-pentanedionato)-trichloroethanoatoaquochromium(III), Cr(C5H7 O2)2 (CCl3 COO)(H2 O). This is attacked by the remaining acac anion to ultimately produce the Cr(acac)3. Thus the effect of the TCE anion in facilitating the formation of Cr(acac)3 is through the ligand coordination catalytic mechanisms.

Affiliations: 1: Department of Chemistry, Makerere University P.O. Box 7062, Kampala, Uganda


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