Synthesis, structure and luminescence property of two lanthanum phosphite hydrates: La2(H2O)x(HPO3)3 (image)

Two new lanthanum phosphite hydrates, La2(H2O)(HPO3)3 (1) and La2(H2O)2(HPO3)3 (2), were synthesized by a hydrothermal method. Their crystal structures were determined by X-ray single-crystal method (1, monoclinic, image (No. 15); image, image, image, image, image; image; 2, triclinic, P-1 (No. 2); image, image, image, image, image, image, image, image). Both crystal structures present three-dimensional open-framework structures containing channels, and 1 adopts intersecting type. In the two structures, the face-sharing dimers of LaOn (image) were observed. Other characterizations by IR and TG–DSC were also described. Furthermore, both the compounds doped with Ce+3 showed intensive broad emission band around 340 nm under UV excitation.