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The asymmetric unit of the title compound, {[MnBr 2 (C 8 H 6 N 4 )]·2H 2 O}  n  , contains one half of a repeat unit of the neutral linear coordination polymer and a solvent water mol­ecule, with the Mn II  ion on a crystallographic twofold axis. In the polymer, inversion-related Mn II  ions are bridged by the bis-chelating 2,2′-bipyrimidine (bpym) ligands, thereby forming a chain structure along the  c -axis direction, and are six-coordinated in a distorted  cis -N 4 Br 2  octa­hedral environment by four N atoms of twofold-related bpym ligands and twofold-related bromide anions. In the crystal, the complex polymers and solvent water mol­ecules are linked by inter­molecular O—H⋯Br and C—H⋯O hydrogen bonds, forming a two-dimensional layered structure extending parallel to the  ac  plane.

acta crystallographica. section e

catena-Poly[[[dibromidomanganese(II)]-μ-2,2′-bipyrimidine-κ4N1,N1′:N3,N3′]dihydrate]