Rational Construction of Chiral Octanuclear Metallacycles Consisting of Octahedral CoIII, Square-Planar PdII, and Linear AuI or AgI Ions

Abstract

Octahedral fac(S)-[CoIII(aet)3] molecules (aet=NH2CH2CH2S−) react with square-planar PdII ions to form a sulfur-bridged CoPdII trinuclear complex [Pd{Co(aet)3}2]2+, accompanied by the geometrical isomerization from fac(S) to mer(S). This complex was found to act as a sulfur-donating trinuclear-metalloligand toward linear AuI and AgI ions to afford CoPdM metallacycles with 16 chiral centers, [M{PdII[CoIII(aet)3]2}2]6+ (M=Ag, Au (1)), which were successfully resolved into the (Δ)4(R)12 and (Λ)4(S)12 enantiomers.