Novel self-assembled chain of water molecules in a metal-organic framework structure of Co(II) with tartrate acid.

1-D water chains constructed by dimer water clusters and edge-sharing cyclic pentamer have been observed in the compound [Co(C4H4O6)(2,2'-bipy) x 5H2O] (1), in which the water chains join the 1-D coordination polymeric chains to a 3-D network through hydrogen-bond interactions.