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Investigation of the Pt-B-O system reveals the first magnesium platinum borate Mg 3 Pt(BO 3) 2 O 2 obtained from the high temperature flux method. The compound crystallizes in the centrosymmetric monoclinic space group C 2/ m (no. 12) with the lattice parameters of a = 16.8073(8) Å, b = 3.10610(1) Å, c = 5.2107(2) Å, and β = 90.546(4)° (Z = 2). The crystal structure of Mg 3 Pt(BO 3) 2 O 2 is based upon isolated BO 3 triangles and PtO 6 and MgO 6 octahedra. The PtO 6 octahedra are connected with each other in an edge-sharing manner forming one dimensional (1D) chains. Each of the PtO 6 octahedra links with two BO 3 units to form anionic [Pt(BO 3) 2 O 2 6- chains along the b -axis. MgO 6 octahedra are arranged in the form of two dimensional (2D) layers. The 2D MgO 6 layers are further connected by the anionic [Pt(BO 3) 2 O 2 6- chains into the 3D framework structure of Mg 3 Pt(BO 3) 2 O 2. The material was experimentally and theoretically characterized in regards to its optical and spectroscopic properties. The first HT platinum borate was experimentally and theoretically characterized in regards to its optical and spectroscopic properties. Image 1 • The first HT platinum borate Mg 3 Pt(BO 3) 2 O 2 was synthesized by high temperature flux method. • The structure was determined by single-crystal X-ray diffraction. • The novel structural chemistry and comparison with related phases were discussed in detail. • Optical properties of the new phase was experimentally and theoretically studied detailly. [ABSTRACT FROM AUTHOR]