Hydrothermal Synthesis, Crystal Structure, and Characterization of Two New Metal Diphosphonates with a 3D Pillared Layered Structure

Abstract

AbstractTwo new metal diphosphonates with a 3D pillared layered framework, [Zn2L]·2H2O (1) and [Sb(HL)(H2O)]·H2O (2) (H4L = H2O3PCH2NC4H8NCH2PO3H2), were synthesized under hydrothermal conditions and structurally characterized by single‐crystal X‐ray diffraction as well as IR spectroscopy, elemental analyses, and thermogravimetric analyses. For compound 1, each ZnO3N tetrahedron is in turn corner‐sharing through three CPO3 tetrahedra from three different phosphonate ligands to form two‐dimensional inorganic layers in the ab plane. In compound 2, the inorganic puckered layers are composed of pseudo‐octahedral bipyramidal SbO5 and CPO3 tetrahedra in the bc plane. The overall structure of both compounds may be described in terms of alternating inorganic infinite layers and organic pillars{–CH2N(C2H4)2NCH2–} to form a 3D pillared layered structure.