Abstract
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 tetrahydroxodecakis-μs-trichloroethanoato-trichloroethanoato-tetraaquopentachro-mium(III), Cr5(OH)4(CCl3COO)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-penaanedtonate, acac, anion to produce a second precursor, the violet-green intermediate species (VGIS) identified as bis(2,4-pentanedionato)-trichloroethanoato-aquochromium(III), Cr(C5H7O2)2(CCl3COO)(H2O). This is attacked by the remainigg acac anion to ultimaelly 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.
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Ssekaalo, H. Precursor trichloroeth anoato-chromium (III) species in the formation of tris (2,4-pentanedionato) chromium (III). Res Chem Intermed 14, 1–14 (1990). https://doi.org/10.1163/156856790X00120
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DOI: https://doi.org/10.1163/156856790X00120