A Pseudorotaxane System Containing γ‐Cyclodextrin Formed via Chiral Recognition with an Au ^I ₆ Ag ^I ₃ Cu ^II ₃ Molecular Cap

Solvent-mediated crystal-to-crystal transformations of [Au6Ag3Cu3(H2O)3(d-pen)6(tdme)2]3+ (d-[1(H2O)3]3+; pen2−=penicillaminate, tdme=1,1,1-tris(diphenylphosphinomethyl)ethane) to form unique supramolecular species are reported. Soaking crystals d-[1(H2O)3]3+ in aqueous Na2bdc (bdc2−=1,4-benzenedicarboxylate) yielded containing d-[1(bdc)(H2O)2]+ due the replacement a terminal aqua ligand by monodentate bdc2− ligand. When γ-cyclodextrin (γ-CD) was added Na2bdc, transformed d-[1(bdc@γ-CD)(H2O)2]+, where γ-CD ring threaded molecule construct pseudorotaxane structure. While use dicarboxylates with an aliphatic carbon chain instead afforded analogous pseudorotaxanes, such were not formed when [Au6Ag3Cu3(H2O)3(l-pen)6(tdme)2]3+ (l-[1(H2O)3]3+) enantiomeric soaked and γ-CD, affording only l-[1(bdc)(H2O)2]+.