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In the crystal structure of the title compound, [CoCl2(C7H12N2)2], mol­ecular units are formed by coordination of the unsubstituted N atoms of two tert-butyl-substituted imidazole mol­ecules and two chloride ligands, which distinguishes the complex from structures of imidazolium-based dications with tetra­chlorido­cobaltate dianions. There are two crystallographically independent mol­ecules in the asymmetric unit, related by a noncrystallographic inversion centre.

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The title platinum(II) complex, [Pt(C10H8BrN2)(C5H7O2)], has a bidentate cyclo­metallated phenyl­imidazolyl­idene ligand and an acetyl­acetonate specta­tor ligand, which form a distorted square-planar coordination environment around the PtII centre. In the solid state, the mol­ecules are oriented in a parallel fashion by inter­molecular hydrogen bonding and π–π and C—H...π inter­actions, while close Pt...Pt contacts are not observed. The structure is only the second example for this new class of compounds.
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