Syntheses, crystal structures and luminescent properties of two new heterometallic phosphates: Sn2Ge(PO4)2(OH)2 and Sn2Mn(PO4)2

Abstract

Two new bimetallic phosphates, namely, Sn2Ge(PO4)2(OH)2 (1) and anhydrous Sn2Mn(PO4)2 (2) have been prepared by a facile hydro/solvothermal method. Compound 1 crystallizes in space group P21/c and features a three-dimensional (3D) framework which is constructed from one-dimensional (1D) [Ge(- PO4)2(OH)2] infinite chains and the SnO3 trigonal pyramids. Compound 2 crystallizes in space group C2/c and also features a 3D framework which is composed of a two-dimensional tin phosphates layer in the bc plane and MnO6 octahedra connected with the adjacent layers. Powder X-ray diffraction (PXRD) patterns, Thermogravimetric analyses (TGA), UV-Vis-NIR absorption spectra and IR spectra for both compounds were examined. TGA results show that anhydrous Sn2Mn(PO4)2 has a high thermal stability under 800 ºC. Their photoluminescence study indicates that 1 and 2 might be pure inorganics for potential intrinsic green and blue light-phosphors, respectively.