Synthesis and Characterization of One-Dimensional Ladder-Like Chain Copper Diphosphonate Cu-3{(C5NH11)C(OH)(PO3)(2)}(2)(H2O)(4)center dot 4H(2)O

This paper reports the synthesis and crystal structure of a new copper diphosphonate Cu-3{(C5NH11) C(OH)(PO3)(2)}(2)(H2O)(4)center dot 4H(2)O (1) based on 1-hydroxy-1-(piperidin-4-yl)methylidenebisphosphonic acid (hpdpH(4)). It shows an infinite ladder-like double chain structure in which the Cu(1)O-5 square pyramids and Cu(2)O-6 octahedra are linked by corner sharing {PO3C} tetrahedra. The double chains are packed in almost inter-perpendicular manner, forming a three-dimensional hydrogen-bonded supramolecular network. The lattice water molecules reside in the channels. The magnetic studies reveal that dominant antiferromagnetic interactions are mediated between the Cu(II) ions. CCDC: 775855.