Abstract
AbstractTwo new metal phosphonates with a 3D pillared layered framework based on N,N′‐piperazinebis(methylenephosphonic acid), H2O3PCH2NC4H8NCH2PO3H2 (H4L), Sn[O3PCH2NHC4H8NHCH2PO3] (1) and Pb3(OH)2[O3PCH2NC4H8NCH2PO3] (2), have been synthesized under hydrothermal conditions and structurally characterized by single‐crystal X‐ray diffraction as well as with infrared spectroscopy, elemental analysis and thermogravimetric analysis. For compound 1, each ψ‐square pyramidal SnO4 unit is in turn corner‐shared by four CPO3 tetrahedral from four different phosphonate ligands to form two‐dimensional inorganic puckered layers in ab planes. In compound 2, the complicated inorganic layer (bc planes) is built up of ψ‐PbO4N, PbO6 and CPO3 polyhedra. The overall structure for two compounds may be described in terms of alternating inorganic infinite layers and organic pillars {CH2N(C2H4)2NCH2}, to form a 3D pillared layered structure.
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