A copper（Ⅱ） coordination polymer, [Cu3（HOA）2（bpp）4]n （1, HnOA = 3,3＇,4,4＇- oxidiphthalic acid, bpp = 1,3-bis（4-pyridyl） propane）, has been hydrothermally synthesized. The crystal structure is of monoclinic, space group P21/c with a = 11.544（3）, b = 16.129（4）, c = 21.181 （6） A, β = 98.848（5）, V= 3897.0（2） A3, C84018N8H70Cu3, Mr = 1670.13, Z = 2, De = 1.423 g/cm^3, F（000） = 1722, μ = 0.887 mm^-1, R = 0.0878 and wR = 0.2583 for 8496 observed reflections （I 〉 2σ（I））. Single-crystal X-ray structural analysis reveals that 1 is a three-dimensional （3D） framework based on a two-dimensional （2D） mesomeric layer of alternating left- and fight-handed helical chains. The monodentate terminal and bidentate bridging bpp ligands in the same conformation are all encapsulated in the figure-of-eight-shaped channels, thus further stabilizing the whole three-dimensional framework.
A new luminescent Cd（Ⅱ） compound, [Cd3（OABDC）2（bipy）2（H2O）2]n （1, H3OABDC = 5-oxyacetateisophthalic acid, bipy = 4,4＇-bipyridine）, has been prepared by the assembly of Cd（Ⅱ） salt with the mixed ligands of H3OABDC and 4,4＇-bipy under hydrothermal conditions. The crystal structure is of monoclinic, space group P2/n with a = 13.6730（5）, b = 10.1265（3）, c = 15.9752（4） , β = 103.061（3）o, V = 2154.70（11） 3, C40H34Cd3N4O18, Mr = 1195.94, Z = 2, Dc = 1.843 g/cm3, F（000） = 1180, μ = 1.549 mm-1, the final R = 0.0409 and wR = 0.1291 for 2746 observed reflections （I 2σ（I））. Single-crystal X-ray structural analysis reveals that compound 1 features a self-penetrating two-dimensional （2D） layered structure. According to topology analysis, this 2D framework can be characterized as a （3,4）-connected （6.72）2 （62.8）2 （73.8.102） net that has never been reported before. Finally, these 2D layers are further linked by intermolecular hydrogen bonds and π…π interactions to form a three-dimensional （3D） supramolecular framework. Moreover, Compound 1 exhibits strong blue photoluminescence at room temperature.
