Hydrothermal Synthesis, Crystal Structure, and Characterizations of Five New Lanthanide(III) Diphosphonates with a Layered Structure

Abstract

AbstractFive new lanthanide(III) diphosphonates, namely, Ln[(HL)(H2O)]·H2O [Ln = La (1), Ce (2), Pr (3), Nd (4), Sm (5); H4L = C6H11N(CH2PO3H2)2] were synthesized under hydrothermal reaction conditions at 140 °C and structurally characterized by X‐ray single‐crystal diffraction, X‐ray powder diffraction, IR spectroscopy, elemental, and thermogravimetric analysis. Compounds 1–5 are isostructural and exhibit a 2D framework structure. The LnO8 polyhedra form 1D zigzag chains along the c axis by edge‐sharing, which are further interconnected by CPO3 tetrahedra through edge‐ and corner‐sharing to form a 2D layer in the ac plane. The cyclohexyl groups of the ligands are orientated toward the interlayer space.