Acta Cryst. (2007). E63, m1977-m1978  [ doi:10.1107/S1600536807029583 ]

A cofacial binuclear copper(II) complex with a bridging 1,4-dithiane ligand

S. Burton, F. R. Fronczek and A. W. Maverick

Abstract: The molecule of (-1,4-dithiane-²S:S')bis{-3,3'-[naphthalene-2,7-diylbis(methylene)]bis(pentane-2,4-dionato)-⁴O,O':O'',O'''}dicopper(II), [Cu₂(C₂₂H₂₂O₄)(C₄H₈S₂)], lies on an inversion center, with a CuCu distance of 8.130 (1) Å. The Cu^II centers have square-pyramidal coordination geometry, with Cu-O distances in the range 1.905 (2)-1.925 (2) Å and a Cu-S distance of 2.8088 (10) Å. The host binuclear complex is distorted from a rectangular shape. The inversion symmetry of the molecule requires that the two coordination planes be parallel. However, they are `slipped': the normals to the two coordination planes at the Cu atoms are 1.865 (1) Å apart. Another measure of this `slipping' is provided by the four CH₂ groups, whose C atoms form a parallelogram with interior angles of 87.2 (3) and 92.8 (3)°. The two chelate rings tilt differently from the coordination plane, with one Cu atom lying only 0.0131 (5) Å out of one C₃O₂ mean plane, but 0.4416 (5) Å out of the other. Those two chelate planes form a dihedral angle of 11.2 (4)°. This relatively large deviation is believed to be due to the large size of the 1,4-dithiane guest.

Online 27 June 2007

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