Lithium aspirinate hemihydrate

The title compound {systematic name: catena-poly[ lithium(I)-mu(3)-acetylsalicylato-hemi-mu(2)-aqua]}, {[Li(C9H7O4)]center dot 0.5H(2)O}(n), is the hemihydrate of the lithium salt of aspirin. The carboxylate groups and water molecules bridge between Li atoms to form a one-dimensional coordination chain composed of two distinct ring types. The water O atom lies on a twofold axis. Hydrogen bonding between water donors and carbonyl acceptors further links the coordination chains to form a sheet structure