Treatment of the ΛLLLΛLLL and ΔLLLΔLLL isomers of K3[Co{Co(l-cys-N,S)3}2] (K3[1], l-cys: l-cysteinate) with Ln(NO3)3 (Ln = La and Yb) in water gave coordination polymers, ΛLLLΛLLL-Ln[1] and ΔLLLΔLLL-Ln[1], respectively, in which [1]3− binds to Ln3+ through carboxylate groups in a 1:1 ratio. It was found that the dimensional structures of Ln[1] are controlled not only by the diastereoisomerism of [1]3− (ΛLLLΛLLL vs. ΔLLLΔLLL) but also by the ionic size of Ln3+ (La3+ vs. Yb3+).
Treatment of the racemic (Δ)2⁄(Λ)2 isomer of the tricationic complex, [Co3(aet)6]3+ ([1]3+), with the optically active (ΛLLL)2 isomer of the trianionic complex, [Co3(l-cys-N,S)6]3− ([2]3−), afforded only the (Δ)2(ΛLLL)2 isomer of the complex salt, [Co3(aet)6][Co3(l-cys-N,S)6] (3), the structure of which was determined by X-ray crystallography. The selective formation of this isomer was also observed when the racemic isomer of [1]3+ was treated with a 1:1 mixture of the (ΔLLL)2 and (ΛLLL)2 isomers of [2]3−.
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