Redetermination of catena-poly[[diaquamanganese(II)]-μ-iminodiacetatoκ4N,O,O′:O"]

The redetermined structure of the title compound, [Mn(C4H5NO4)(H2O)(2)](n), including the full hydrogen-bonding scheme, is reported; the original report was by Zhang & Lu [Acta Cryst. (2004). E60, m1189-m119O]. The structure contains polymeric chains of Mn-II cations bridged by iminodiacetate (IDA) dianions. The manganese species assumes a distorted octahedral coordination geometry, formed by two IDA molecules (one tridentate and one monodentate) and two water molecules. The tridentate IDA chelates to the Mn atom in the facial configuration; one chelating five-membered ring is almost planar and the other adopts an envelope configuration. A significant difference of 0.118 (2) Angstrom in Mn-O-carboxyl bond distances is observed within the chelating IDA moiety.