Abstract
Hydrothermal reactions of N-piperidinomethane-1-phosphonic acid (H2pmp) and oxalate anion with trivalent rare earth metal ions yielded 13 rare earth oxalatophosphonates with three closely related structural types, ranging from two-dimensional (2D) networks to three-dimensional (3D) frameworks. They are formulated as [Ln3(Hpmp)3(C2O4)2(H2O)5](ClO4)2·9H2O [Ln = Gd (1), Eu (2), Tb(3), type I structure], [Ln2(Hpmp)(C2O4)2.5(H2O)3]·H2O [Ln = Gd (5), Sm (6), Eu (7), Tb (8), Dy (9), Ho (10), Er (11), Yb (12), Y (13), type II structure], and [Gd3(Hpmp)(C2O4)4(H2O)6]·5H2O [(4), type III structure]. Their structures were characterized by single crystal X-ray diffraction, powder X-ray diffraction (PXRD), infrared (IR) spectroscopy, elemental analysis (EA), and thermogravimetric analysis (TGA), except that the structures of compounds 2 and 3 were confirmed by PXRD, IR, and EA. The effects of reaction conditions including pH value, reaction temperature, counterion, and stoichiometry of the starting materials on the st...
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