Uncoordinated inorganic salt in 1D chain structure: formation of a novel supermolecule [HgBr2(ptz)]2 · HgBr2 (ptz=phenothiazine)

A novel supermolecule [HgBr2(ptz)]2 · HgBr2 (ptz=phenothiazine) with uncoordinated inorganic salt HgBr2 presented in a 1D chain was prepared. The bulky ligand phenothiazine has unusual coordination mode with large steric inhibition perpendicular to the chain direction. The uncoordinated HgBr2 molecule was stabilized by multiple weak Hg⋯Br interactions and the whole structure was also stabilized by strong π–π interactions and N–H⋯Br hydrogen bonds to form 2D network.