Polynuclear complexation between tris(thenoyltrifluoroacetonato)lanthanoid(III) and tris(acetylacetonato)-chromium(III) or-cobalt (III)

摘要

Polynuclear complexation between tris(thenoyltrifluoroacetonato)lanthanoid(III) (Ln(tta)_3) and tris(acetylacetonato)-chromium(III) or -cobalt(III) (M(acac)_3) has been studied by the liquid-liquid distribution and spectroscopic method such as electronic absorption and NMR. From the equilibrium analysis, it was found that both acac chelates formed a binuclear complexes with Ln(tta)_3 in an organic solvent, and the formation constants (#beta#_(s,l)) were determind. The #beta#_(s,l) value of Cr(acac)_3 was lower than that of Co(acac)_3 for each of Las. A trend in #beta#_(s,l) of Ln(tta)_3-Cr(acac)_3 was markedly different from that of Ln(tta)_3-Go(acac)_3.