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Homobinuclear complex (HCuL) 2 (1) (H 3 L: N-3-carboxylsalicylidene-N'-salicylaldehyde-1,2-diaminoethane) was obtained from self-organization of the reported complex HCuL, and its crystal structure was determined through X-ray diffraction at room temperature. The crystal of complex 1 belongs to monolinic system, the space group Cc, a＝2.5326(5) nm, b＝0.88861(18) nm, c＝1.3738(3) nm, β＝96.95(3)°, Z＝4, R 1 ＝0.0520, wR 2 ＝0.1185. (HCuL) 2 is a dimeric molecule and has extended phenolic oxygen-bridged structure. In addition, using mononuclear complex HCuL as building blocks, Cu(II)-Mg(II)-Cu(II) heterotrinuclear complex 2 was synthesized, and its crystal structure also has been determined by X-ray analysis. The crystal of complex 2 is of monoclinic system, space group P c , a＝1.1816 (2)

Hydrothermal reaction of Cd(II) acetate with the bridging ligand m-H 4 bptc (m-H 4 bptc = biphenyl-2,3 ,3,4 -tetracarboxylic acid) yielded a new 2D metal-organic coordination polymer with helical chains in the solid state namelyThe helices are further connected through hydrogen bonds to give a threedimensional supramolecular network. The thermal stability of complex 1 was studied by thermogravimetric (TG) and differential thermal analysis (DTA). Compound 1 exhibits photoluminescence with an emission maximum at ca. 399 nm upon excitation at 360 nm.