A Sr2+-metal-organic framework with high chemical stability: synthesis, crystal structure and photoluminescence property

Two metal-organic frameworks based on Sr2+ and 1,2,4,5-tetra-kis-(4-carb-oxy-phen-yl)benzene linkers

Two structurally different metal-organic frameworks based on Sr2+ ions and 1,2,4,5-tetra-kis-(4-carb-oxy-phen-yl)benzene linkers have been synthesized solvothermally in different solvent systems and studied with single-crystal X-ray diffraction technique. These are poly[[μ12-4,4',4'',4'''-(benzene-1,2,4,5-tetra-yl)tetra-benzoato](di-methyl-formamide)-distrontium(II)], [Sr2(C34H18O8)(C3H7NO)2] n , and poly[tetra-aqua-{μ2-4,4'-[4,5-bis-(4-carb-oxy-phen-yl)benzene-1,2-di-yl]dibenzoato}tris-trontium(II)], [Sr3(C34H20O8)2(H2O)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.

Strontium-coordination polymers based on tetrafluorophthalic and phthalic acids: mechanochemical synthesis, ab initio structures determination, and spectroscopic characterization

New fluorinated and fluorine-free Sr-based coordination polymers were synthesized by milling of Sr-hydroxide samples with tetrafluorophthalic acid and phthalic acid, respectively.