Metal-organodiphosphonate chemistry: Hydrothermal syntheses and structures of Ca(II) coordination polymers with xylyldiphosphonate ligands

Hydrothermal reactions were exploited in the syntheses of three Ca(II)-organodiphosphonate materials: the three-dimensional [Ca(p-C8H8P2O6H2)(OH2)3]n (1), the one-dimensional [Ca(m-C8H8P2O6H2)(OH2)2]n (2), and the two-dimensional [Ca(o-C8H8P2O6H2)(OH2)]n (3). A view of the structure of compound 1 is shown.