Hydrothermal Syntheses, Crystal Structures and Luminescence Properties of Zn(Ⅱ) and Cu(Ⅱ) Complexes Based on 2,2'-((Sulfonylbis(4,1-phenylene))bis(oxy))diacetic Acid

The 2,2’-((sulfonylbis（4,1-phenylene）)bis（oxy）)diacetic acid（H;L） and 4,4’-bipyridine（4,4’-bipy） are employed as organic ligands to react with metal salts to obtain two new metal-organic frameworks（MOFs）, namely [M;L;（4,4’-bipy）](M = Zn（1）, Cu（2）). They have been successfully synthesized under hydrothermal conditions. Single-crystal X-ray diffraction reveals that two complexes are isostructural and crystallize in orthorhombic system with space group Pbcn. All L;ligands bridge metal ions to form an infinite 1D Z-shaped chain along the a axis. Then through 4,4’-bipy, contiguous Z-shaped chains are linked to form a 2D layer structure. The luminescent studies of the H;L ligand and complex 1 in the solid state and thermogravimetric analyses（TGA） of two complexes are investigated.