new compounds Zn(pinH)(H2O) (1) and Cd(pinH) (2) have been obtained through the reactions of zinc (or cadmium) sulfate and 2-phosphonic-isonicotinic acid (pinH3). The former has a layer structure in which double chains composed of corner-sharing ZnO5N} octahedra and CPO3} tetrahedra are cross-linked through the carboxylate groups. The latter has a framework structure where the inorganic layers composed