A new cobalt compound,{[Co（H2btec）（2,2＇-bipy）（H2O）3]·H2O}n （1,H4btec=1,2,4,5-benzenetetracarboxylic acid,2,2＇-bipy=2,2＇-bipyridine）,has been synthesized and charac-terized by single-crystal X-ray diffraction,elemental analysis,IR and X-ray powder diffraction.The crystal belongs to the triclinic system,space group P1,with a=7.230（3）,b=11.626（5）,c=14.001（6）,α=108.12（0）°,β=95.85（0）°,V=1095.33（157）3,C20H20CoN2O12,Mr=539.31,Z= 2,Dc=1.635 g/cm3,μ=0.855 mm-1,F（000）=554,R=0.0427 and wR=0.1042 for 3883 observed reflections （I 〉 2σ（I））.The title compound features a discrete molecular structure,which is connected with each other through extensive O-H…O hydrogen bonds into an intricate 3D supramolecular network.Additionally,two different patterns of π-π stacking interactions further consolidate the framework.
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.
A novel zinc coordination polymer, [Zn2（bptc）（bpe）（H2O）]n （1, Habptc = 3,3＂,4,4＂- benzophenonetetracarboxylate, bpe = 1,2-bis（4-pyridyl） ethane）, has been prepared under hydrothermal conditions. The crystal structure is of monoclinic, space group C/2c with a = 27.50（2）, b = 6.207（4）, c = 16.233（11） A, β = 107.522（14）°, V= 2642 （3） As, C29H22N2O11Zn2, Mr = 705.27, Z = 4, Dc = 1.773 g/cm3, F（000） = 1432, p = 1.887 mm-1, R = 0.0421 and wR = 0.1049 for 2594 observed reflections （I 〉 20（/））. X-ray single-crystal diffraction analysis shows that 1 features two-dimensional [Zn2（bptc）（H2O）] layers, which are further linked by the bpe ligands to give rise to a three-dimensional pillar-layered structure. According to the topology analysis, this framework can be simplified into a （4,6）-connected （4^4.6＆2）（4^4.6^10.8） network.
