Tetrapyridoxycalix[4]arene and its copper(II) complex: An ionic crystal engineering tecton for self-inclusion polymers

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The crystal structures of a tetradentate pyridylcalix[4]arene ligand and its first copper(II) complex are discussed. The metal free ligand is mainly self-assembled by dipole–dipole interactions and a combination of CH–N bonds and CH–π interactions. The corresponding copper(II) perchlorate complex exhibits a self-inclusion behaviour to supramolecular zig-zag polymers.

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