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The asymmetric unit of the title compound, [Mn(CH(3)CN)(C(8)H(6)N(4))(2)(H(2)O)][Mn(C(8)H(6)N(4))(2)(H(2)O)(2)](ClO(4))(4)·2H(2)O, contains two distinct cationic Mn(II) complexes, four perchlorate anions and two solvent water mol-ecules. In the two complexes, both Mn(II) ions are six-coordinated in a distorted octa-hedral environment, but one Mn ion has a cis-N(5)O coordination geometry defined by four N atoms of the two chelating 2,2'-bipyrimidine (bpym) ligands, one N atom of a coordinating acetonitrile mol-ecule and one O atom of a water ligand, whereas the other Mn ion has a cis-N(4)O(2) coordination geometry defined by four N atoms of the two bpym ligands and two O atoms of water ligands. In the crystal structure, the complex mol-ecules, anions and solvent water mol-ecules are linked by inter-molecular O-H⋯O and O-H⋯N hydrogen bonds. Three of the four perchlorate anions are disordered over two sets of sites in different ratios.

acta crystallographica. section e

cis-(Acetonitrile-κN)aquabis(2,2′-bipyrimidine-κ2N1,N1′)manganese(II)cis-diaquabis(2,2′-bipyrimidine-κ2N1,N1′)manganese(II) tetrakis(perchlorate) dihydrate