The X-Ray Crystallography Evidence of Selective Co-Crystallization Between [Au<sup>I</sup><sub>6</sub>Ag<sup>I</sup><sub>3</sub>Cu<sup>II</sup><sub>3</sub>]<sup>3+</sup&

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.