Mg₃Pt(BO₃)₂O₂: The first platinum borate from the flux technique

Investigation of the Pt-B-O system reveals the first magnesium platinum borate Mg3Pt(BO3)(2)O-2 obtained from the high temperature flux method. The compound crystallizes in the centrosymmetric monoclinic space group C2/m (no. 12) with the lattice parameters of a = 16.8073(8) angstrom, b = 3.10610(1) angstrom, c = 5.2107(2) angstrom, and beta = 90.546(4)degrees (Z = 2). The crystal structure of Mg3Pt(BO3)(2)O-2 is based upon isolated BO3 triangles and PtO6 and MgO6 octahedra. The PtO6 octahedra are connected with each other in an edge-sharing manner forming one dimensional (1D) chains. Each of the PtO6 octahedra links with two BO3 units to form anionic [Pt(BO3)(2)O-2](6-) chains along the b-axis. MgO6 octahedra are arranged in the form of two dimensional (2D) layers. The 2D MgO6 layers are further connected by the anionic [Pt(BO3)2O(2)](6-) chains into the 3D framework structure of Mg3Pt(BO3)(2)O-2. The material was experimentally and theoretically characterized in regards to its optical and spectroscopic properties.