catena-Poly[[(4-methyl­benzoato-κO)manganese(II)]-μ-aqua-bis­(μ-4-methyl­benzoato-κ(2) O:O′)[(4-methyl­benzoato-κO)manganese(II)]-bis­(μ-N,N-diethyl­nicotinamide)-κ(2) N (3):O;O:N (3)]

The asymmetric unit of the title complex, [Mn(2)(C(8)H(7)O(2))(4)(C(10)H(14)N(2)O)(2)(H(2)O)](n), contains two crystallographically independent units. In each one, the Mn(II) ions are bridged by two 4-methyl­benzoate (PMB) ligands and one water mol­ecule. In the crystal structure, each Mn(II) ion is coordinated by three PMB ligands, one water mol­ecule and two symmetry-related N,N-diethyl­nicotinamide (DENA) ligands. Symmetry-related Mn(II) ions are bridged by the N and O atoms of symmetry-related DENA ligands, forming polymeric chains parallel to [100]. The coord­ination environmnts for the Mn(II) ions are slightly distorted octa­hedral. Intra­molecular O—H⋯O hydrogen bonds link bridging water mol­ecules to the carboxyl­ate O atoms of a neigh­boring polymeric chain. In the crystal structure, π–π contacts between benzene rings [centroid–centroid distance = 3.562 (1) Å] and weak C—H⋯π inter­actions are also observed.