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Figure 9
(Top) A trimeric unit with the hanging contacts (red dashed lines) starting from the O—H and COO hydrogen-bond donors and acceptors. (Bottom) The extended supramolecular structure, showing three trinuclear com­plexes above and below the starting unit; the expanded contacts are indicated in gray and the hanging contact is in red. In the images, the counter-ions, the piperonal moieties and H atoms which do not participate in the short contacts have been omitted for clarity.

ISSN: 2052-5206
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