Coordination polymeric solid, {[Ag 2 (bpp) 2 (H 2 O) 2 ](chd)·9H 2 O} n (1) (bpp = 1,3-bis(4-pyridyl) propane, H 2 chd = 1,4-cyclo-hexanedicarboxylic acid), has been obtained by the solution phase ultrasonic synthesis techniques. The structure established through X-ray structural analysis shows that the compound traps an interesting 1D water tape built by the alternating "three-pointed star" cage-like pentameric and D 2h tetrameric clusters (C2/c, Z = 4; a = 30.37(2) , b = 9.271(5) , and c = 18.89(1) ; β = 128.47°; V = 4164(4) 3 ). The novelty of the present complex is the rarely crystallographic example of the cage-shaped water pentamer, which is usually ascribed to a less-stable species. A first-principle density functional theory (DFT) calculation demonstrates that the interconnectivity between cage-like pentamers and D 2h tetramers is beneficial for contribution to the structural stabilization of these less-stable water cluster species.
An octameric water moiety which consists of a chairlike water hexamer and two pendent water molecules in the 1,4-diaxial positions and shows a similar structure to the hydrocarbon （lr,4r）-1,4-dimethylcyclohexane, is unambiguously trapped in a 2D Cu（II） mixed-ligand coordination polymer, {[Cu2（bpp）2（HzO）2（bpda）2]＇6H2O}n （1） （bpp = 1,3-bis（4-pyridyl）propane and H2bpda = 2,2＇-biphenyldicarboxylic acid）. The water octamer can be extended into a hybrid carboxylate-water decamer when carboxylic oxygen atoms from bpda2- are involved. Interestingly, the present hybrid decamer bears a similar structural topology to a butterfly （H2O）10 cluster. The reversible dehydration/hydration of 1 is determined by X-ray powder diffraction studies.
LUO GengGengWU DongLiangLIU LiLI DongXuZHAO QingHuaXIAO ZiJingDAI JingCao
The new complex, [Co2（adc）2（py）4（H2O）}n 1 （adc = 1,3-adamantanedicarboxylate, py = pyridine）, has been hydrothermally synthesized as polymeric solid, and characterized by X-ray diffraction, elemental analysis, IR spectra and thermogravimetric analysis. Complex 1 crystallizes in monoclinic, space group C2/c with a = 18.932（4）, b = 19.779（4）, c = 12.352（3） , β = 112.03（3）o, V = 4288（2） 3, Z = 4, GOF = 0.998, R = 0.0518 and wR = 0.1074. X-ray single-crystal analysis reveals that 1 presents a 3D simple parallel rod-like supramolecular array constructed by 1D tape-like polymeric motif through aromatic π-π stacking interaction. Electrochemical investigation shows that 1 exhibits appreciable electrocatalytic activity for the reduction reaction of nitrite.
The polymeric solid, [Cu（bpy）（tp）（H2O）]n 1 （tp = terephthalate, bpy = 2,2＇-bipyridine）, has been obtained from the hydrothermal approach and characterized by X-ray diffraction, elemental analysis, IR spectra and thermogravimetric analysis. Compound 1 crystallizes in triclinic, space group P1 with a = 9.360（2）, b = 9.872（2）, c = 10.774（2）A, α = 106.281（5）, β = 112.471（5）, γ = 96.697（3）°, V = 854.5（3）A^3, Z = 2, GOF = 1.09, R = 0.0318 and wR = 0.0845. X-ray single-crystal analysis reveals that 1 is an interesting 3D staggered brickwall-like supramolecular array assembled through aromatic π-π stacking and hydrogen bonding interactions of 1D infinite zigzag polymeric chains.
Ce/Sm ions are covalently grafted to a Keggin polyoxomolybdate cluster[PMo12O40]3-to yield interesting fluorescent-photodarkening molecular systems.Their photoresponce processes are observed to be activated via energy transfer from luminescent fragments to photocoloration components.
