Abstract
Two examples of copper(II)-assisted self-assembly of bis-N,O-bidentate Schiff base ligands L55 and L56 with an aromatic spacer group are described. Single-crystal X-ray analyses demonstrated clearly the formation of a tetranuclear double-helical architecture for the L55–CuII system and a dinuclear non-helical U-shaped one for the L56–CuII system. The self-assembly process for these systems in solution has been deduced from UV-vis and ESI mass spectral and analytical data. Aromatic π⋯π and CH⋯π interactions between the spacer groups in L55 and L56 could stabilize these unprecedented supramolecular motifs in solution and the solid state. Their crystal packings are also controlled by the aromatic interactions between two entities.
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