catena-Poly[[di-[mu]₂-aqua-hexaaquabis­([mu]₃-4-oxido­pyridine-2,6-di­carboxyl­ato)tri­manganese(II)] trihydrate]: a new one-dimensional coordination polymer based on a trinuclear Mn^II complex of chelidamic acid

A one-dimensional coordination polymer with a twofold symmetric repeat unit containing three Mn^II centres. Two different coordination geometries are observed for the two independent Mn^II metal centres, viz. a distorted penta­gonal bipyramid and a distorted octa­hedron.