Synthesis, crystal structure, and thermal properties of poly[aqua-(μ 5 -2,5-di-carb-oxy-benzene-1,4-di-carboxyl-ato)strontium]

A coordination polymer formulated as [Sr(H BTEC)(H O)] (H BTEC = benzene-1,2,4,5-tetra-carb-oxy-lic acid, C H O ), was synthesized hydro-thermally and characterized by single-crystal and powder X-ray diffraction, scanning electron microscopy and thermal analysis. Its crystal structure is made up of a zigzag inorganic chain formed by edge-sharing of [SrO ] polyhedra running along [001]. Adjacent chains are connected to each other the carboxyl-ate groups of the ligand, resulting in a double-layered network extending parallel to (100). O-H⋯O hydrogen bonds of medium-to-weak strength between the layers consolidate the three-dimensional structure. One of the carb-oxy-lic OH functions was found to be disordered over two sets of sites with half-occupancy.