Two metal–organic frameworks based on Sr(2+) and 1,2,4,5-tetra­kis­(4-carb­oxy­phen­yl)benzene linkers

Two structurally different metal–organic frameworks based on Sr(2+) ions and 1,2,4,5-tetra­kis­(4-carb­oxy­phen­yl)benzene linkers have been synthesized solvothermally in different solvent systems and studied with single-crystal X-ray diffraction technique. These are poly[[μ(12)-4,4′,4′′,4′′′-(benzene-1,2,4,5-tetra­yl)tetra­benzoato](di­methyl­formamide)­distrontium(II)], [Sr(2)(C(34)H(18)O(8))(C(3)H(7)NO)(2)]( n ), and poly[tetra­aqua­{μ(2)-4,4′-[4,5-bis­(4-carb­oxy­phen­yl)benzene-1,2-di­yl]dibenzoato}tris­trontium(II)], [Sr(3)(C(34)H(20)O(8))(2)(H(2)O)(4)]. The differences are noted between the crystal structures and coordination modes of these two MOFs, which are responsible for their semiconductor properties, where structural control over the bandgap is desirable. Hydrogen bonding is present in only one of the compounds, suggesting it has a slightly higher structural stability.