Key indicators: single-crystal X-ray study; T = 298 K; mean (C-C) = 0.008 Å; R factor = 0.050; wR factor = 0.100; data-to-parameter ratio = 23.1.The reaction of equimolar amounts of zinc bromide and 2,9-dimethyl-1,10-phenanthroline in dry methanol provided the title compound, [ZnBr 2 (C 14 H 12 N 2 )], in good yield. The Zn II ion is coordinated in a distorted tetrahedral environment by two N atoms from the chelating 2,9-dimethyl-1,10-phenanthroline ligand and two bromide ions. There is intermolecular -stacking between adjacent phenanthroline units, with centroid-centroid distances of 3.594 (3) and 3.652 (3) Å .
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