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

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The molecule of (-1,4-dithiane-2 S:S′)bis-{-3,3′- [naphthal-ene-2,7-diyl-bis(methyl-ene)]bis-(pentane-2,4-dionato)-4 O,O′:O′′,O′′′}-dicopper(II), [Cu2(C22H22O4)(C4H8S2)], lies on an inversion center, with a Cu⋯Cu distance of 8.130 (1) Å. The CuII 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 recta-ngular shape. The inversion symmetry of the mol-ecule 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 inter-ior 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. © International Union of Crystallography 2007.

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Acta Crystallographica Section E: Structure Reports Online

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