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In the complex cation of the title compound, [Mn(C 7 H 5 O 4 )(C 12 H 8 N 2 ) 2 (H 2 O)](C 7 H 5 O 4 )·0.5H 2 O, the Mn II  atom has a six-coordinate octa­hedral environment defined by one carboxyl­ate O atom belonging to a 2,6-dihy­droxy­benzoate (DHB) ligand, four N atoms from two chelating 1,10-phenanthroline mol­ecules and one water mol­ecule. The lattice water mol­ecule lies on a twofold rotation axis. Intra­molecular O—H⋯O hydrogen bonds are present in the DHB anions and complex cations. Inter­molecular O—H⋯O hydrogen bonds link two cations, two anions and one water mol­ecule into a dimer. π–π inter­actions between the pyridine and benzene rings and between the benzene rings are also observed [centroid–centroid distances = 3.7774 (16), 3.7912 (16) and 3.7310 (17) Å].

acta crystallographica. section e

Aqua(2,6-dihydroxybenzoato-κO 1)bis(1,10-phenanthroline-κ2 N,N′)manganese(II) 2,6-dihydroxybenzoate hemihydrate