The X-Ray Crystallography Evidence of Selective Co-Crystallization Between [AuI₆AgI₃CuII₃]³⁺ Chiral Metallo-Supramolecular Complex and Λ‒[Co(EDTA)]⁻ Isomer

Co-crystalization is a beneficial method to combine two molecules possessing different charges into a single crystal form. Here, we coincidentally crystallized 12-nuclear complex cation of [AuI6AgI3CuII3(tdme)2(D-pen)6]3+ (D-pen2− = D-penicillaminate, tdme = 1,1,1-tris(diphenylphosphinomethyl)ethane), [AuI6AgI3CuII3]3+ and [Co(EDTA)] (EDTA = ethylenediaminetetraacetate) complex anion. The complex salt was obtained from a mixed reaction solution of [AuI6AgI3CuII3](TFA)3 (TFA = trifluoroacetate) and rac-K[Co(EDTA)] through a slow evaporation process. Single crystal X-ray diffraction analysis indicated that a new hybrid complex [{Au6Ag3Cu3}{Co(EDTA)}](TFA)2 (1), which contains only the Λ configurational isomer of [Co(EDTA)]− through the Cu−O coordination bond.