Crystal Structures, Characterizations and Fluorescence Properties of Two 3D Ca(Ⅱ)/Sr(Ⅱ) Coordination Polymers Based on 2-Sulfoterephthalate

摘要

Two alkaline earth metal coordination polymers [M(2-Hstp)(H2O)] (M =Ca2+ (1) and Sr2+ (2),2-H3stp =2-sulfoterephthalate) were synthesized under hydrothermal conditions by the precursor [Mn(2-Hstp)2(4,4'-Hbpy)2] and alkaline earth metal salts.The two alkaline earth complexes are not isomorphic.Complex 1 crystallizes in the monoclinic space group P21/m,while 2 in the monoclinic space group P21/c,despite of their similar formulas.In 1,the Ca2+ ion lies in a seven-coordinated pentagon bipyramidal configuration,coordinated with five 2-Hstp2-anions and one water molecule.However,the Sr2+ ion in 2 is coordinated by nine oxygen atoms to form a single-capped square antiprism polyhedron.Both 1 and 2 exhibit r-a-* emission of the 2-sulfoterephthalate ligand.