2 CONFORMATIONAL (CONFIGURATIONAL) ISOMERS OF 8,11-TETRAAZACYCLOTETRADECANE-KAPPA-N-4]COPPER(II)

The crystal structure of the title compound, [Cu(ClO4)(2)(C14H32N4)], has been determined by X-ray diffraction. X-ray structure analysis rev eals that, owing to disorder, the compound exists in two forms, A and B. The coordination polyhedron about the Cu-II ion is centrosymmetric. The Cu-II ion is six-coordinated in a distorted octahedral geometry, with the four N atoms of the macrocyclic ligand in equatorial position s and the two perchlorate O atoms in axial positions. The four chiral N-atom centres have a 1RS,4RS,8SR,11SR configuration and a 1SR,4RS,8RS ,11SR configuration, respectively, for the two forms, A and B. However , both have a 5RS,6RS,12SR,13SR configuration for the four chiral C-at om centres. Hydrogen bonds help stabilize the crystal structure.