trans-(DL-isoleucinato-N,O)[tris(2-aminoethyl)amine-kappa N-4]cobalt(III) diperchlorate

The racemic title compound, trans-[N,N-bis(2-aminoethyl)-1,2-ethanediamine- kappa N-4](DL-isoleucinato-N,O)cobalt(III) diperchlorate, [Co(C6H18N4)(C6H1 2NO2)](ClO4)(2), crystallizes in the enantiomorphous space group P2(1)2(1)2 (1) with Z = 12 (Z' = 3). Each of the three cations in the asymmetric unit represents a different chirality of the isoleucine ligand; two of them are R (or D) and the third is the S (or L) enantiomer. The mixture crystallizes in a so-called unbalanced crystallization, in which the cations adopt a ch iral array of composition RRS or SSR, depending on the crystal selected for data collection.