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Four new mercury coordination supramolecular complexes (1D and 0D), [Hg(L)(Br)₂]_n (1), [Hg(L)(Cl)₂]_n (2), [Hg(L)(SCN)₂]_n (3) and [Hg₂(L)₂(I)₄] (4) where L = C₆H₈N₂ (3-picolylamine), have been synthesized under different experimental conditions. Micrometric crystals (bulk) or nano-sized materials have been obtained depending on using the branch tube method or sonochemical irradiation. All materials have been characterized by scanning electron microscopy (SEM), powder X-ray diffraction (PXRD) and FT-IR spectroscopy. Single crystal X-ray analyses on complexes 1–4 show that Hg²⁺ ions are 4, 5, 4 and 4-coordinated, respectively. Topological analysis shows that the complexes 1–4 are 2C1, 2,2,4C1, 2C1 and 1,2,4M16-1 net, respectively. Also, by changing counter ions, various structures were obtained: 1–4 (0D and 1D) which are helical chain, linear chain and rectangular molecule. The role of …