A Pseudorotaxane System Containing γ-Cyclodextrin Formed via Chiral Recognition with an AuI6AgI3CuII3 Molecular Cap |
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| Authors: | Dr Tatsuhiro Kojima Hiroto Takeda Dr Naoto Kuwamura Prof Takumi Konno |
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| Institution: | Department of Chemistry, Graduate School of Science, Osaka University Toyonaka, Osaka, 560-0043 Japan |
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| Abstract: | 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 of d - 1 (H2O)3]3+ in aqueous Na2bdc (bdc2−=1,4-benzenedicarboxylate) yielded crystals containing d - 1 (bdc)(H2O)2]+ due to the replacement of a terminal aqua ligand in d - 1 (H2O)3]3+ by a monodentate bdc2− ligand. When γ-cyclodextrin (γ-CD) was added to aqueous Na2bdc, d - 1 (H2O)3]3+ was transformed to d - 1 (bdc@γ-CD)(H2O)2]+, where a γ-CD ring was threaded by a bdc2− molecule to construct a pseudorotaxane structure. While the use of dicarboxylates with an aliphatic carbon chain instead of bdc2− afforded analogous pseudorotaxanes, such pseudorotaxane species were not formed when crystals of Au6Ag3Cu3(H2O)3(l -pen)6(tdme)2]3+ (l - 1 (H2O)3]3+) enantiomeric to d - 1 (H2O)3]3+ were soaked in aqueous Na2bdc and γ-CD, affording only crystals containing l - 1 (bdc)(H2O)2]+. |
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| Keywords: | γ-CD chiral recognition multinuclear complex pseudorotaxane X-ray crystallography |
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