The structure determination of M2muc3·8H2O (M = La, Ce, Pr, Nd; muc = mucate, [OOC(CHOH)4COO]2-) shows an open 3D network with hexagonal channels running parallel to the unique direction. A second crystalline form of hydrated Nd2muc3 is obtained, which is shown to be a 2D polymer with the (6,3) topology and with a geometry resembling brickwork. In this structure, sheets of Nd2muc3(H2O)4 are cemented to neighbours by an extensive hydrogen bonding system so as to generate parallel channels of almost square cross-section running normal to the sheets. Crystals of Eu2muc3(H2O)4·10H2O are isostructural with the orthorhombic form of Nd2muc3(H2O)4·10H2O.
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