Synthesis, crystal structure and characterizations of a novel lanthanide oxalatophosphonate with a 3D open-framework structure [Gd 2{HO 3PCH 2NHCH 2(CH 2CH 2OPO 2)}(C 2O 4) 2.5(H 2O) 2] · 5H 2O

Abstract

A novel lanthanide oxalatophosphonate, [Gd 2{HO 3PCH 2NHCH 2(CH 2CH 2OPO 2)}(C 2O 4) 2.5(H 2O) 2] · 5H 2O 1 has been synthesized by hydrothermal reaction at 140 °C and structurally characterized by single-crystal X-ray diffraction as well as with infrared spectroscopy, elemental analysis and thermogravimetric analysis. The interconnection of gadolinium(Ш) ions by bridging H 2L – anions leads to a 3D open-framework structure with channels along the a-axis. The channel is formed by 44-membered rings composed of six gadolinium(Ш) ions and six H 2L – anions. The chelating and bridging oxalates are found on the surface of the channels extending along the a direction.