1D and 3D arrays of isomeric cadmium(II) diphosphonates constructed from N,N-dimethylaminomethane-1,1-diphosphonate ligand

Two isomeric cadmium(II) diphosphonates, with the same formula of [Cd(H3L)2] (H4L = (CH3)2N-CH(PO3H2)2), have been synthesized and structurally characterized. One isomer shows a 1D chain structure whereas the other exhibits a novel non-centrosymmetric 3D framework which is formed by a pillared-layer array.