Two Conformational (Configurational) Isomers of Diperchlorato[(5RS,6RS,12SR,13SR)-5,6,12,13-tetramethyl-1,4,8,11-tetraazacyclotetradecane-κ⁴N]copper(II)

The crystal structure of the title compound, [Cu(ClO₄)₂(C₁₄H₃₂N₄)], has been determined by X-ray diffraction. X-ray structure analysis reveals that, owing to disorder, the compound exists in two forms, A and B. The coordination polyhedron about the Cu^IIion 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 positions 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-atom centres. Hydrogen bonds help stabilize the crystal structure.

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