A polynuclear complex [Cd(endc)(H2O)]n·nH2O (endc = endo-norbornene-cis-5,6-dicarboxylate anion) has been synthesized by the hydrothermal reaction of cadmium nitrate tetrahydrate with endo-norbornene-cis-5,6-dicarboxylic acid in 1:1 molar ratio, and structurally characterized by single-crystal X-ray diffraction. It crystallizes in monoclinic, space group P21/c with a = 1.16471(7), b = 0.95334(7), c = 0.91109(9) nm, Z = 4, V = 1.01035(14) nm3, Dc = 2.160 g/cm3, μ = 2.172 mm-1, F(000) = 648, R = 0.0302 and wR = 0.0752. According to structural analysis, each Cd(Ⅱ) ion is coordinated to six O atoms from three endc anions and one water molecule, giving a distorted octahedral geometry. Two-dimensional layer arrangement of the title complex is constructed from the bridging nature of endc. It is worth notice that adjacent two-dimensional layers are joined together to form a three-dimensional supramolecular framework via intermolecular hydrogen bonding interactions.
The title compound, [Cu(C6H4N2O4F)2(H2O)4]·4(H2O) I, has been hydrothermally synthesized and structurally determined by single-crystal X-ray diffraction method. It crystallizes in monoclinic, space group P21/c with a = 8.3041(17), b = 12.045(2), c = 11.077(2) , β = 92.567(3)o, V = 1106.8(4) 3, Mr = 581.89, Z = 2, Dc = 1.746 g/cm3, F(000) = 598, μ(MoKα) = 1.090 mm–1, the final R = 0.0296 and wR = 0.0806 for 3195 observed reflections with I > 2σ(I). In the centrosymme- tric compound I, each Cu(II) ion is coordinated by six O atoms from two 5-fluorouracil-1-acetate anions and four water molecules, forming a six-coordinated octahedral environment. NHO and OHO hydrogen-bonding interactions are observed in the structure, leading to the formation of a three-dimensional network.
A novel supramolecular polymolybdic(VI) acid was unexpectedly synthesized by the reaction of sodium molybdate with 1,2,4,5-benzenetetracarboxylic and trichloroacetic acids in 1:1:1 molar ratio under hydrothermal condition. The crystal belongs to tetragonal with space group P4/mbm, a = 0.88867(17), b = 0.88867(17), c = 0.55676(15) nm, Z = 3, V = 0.43969(17) nm3, Dc = 4.486 g/cm3, μ = 4.365 mm-1, F(000) = 576, R = 0.0273 and wR = 0.0679. In the crystal, the Mo(VI) atoms are six- and five-coordinated in distorted octahedral and trigonal bipyramidal geometries, respectively. Furthermore, these Mo(VI) atoms, bearing different coordinated environments, are bridged by OH groups with disorder O atoms to form a two- dimensional framework with pentagonal grids. It is worthy of notice that these adjacent two- dimensional frameworks are extended into a three-dimensional supramolecular array with pen- tagonal large cavities by Van Der Waals’ forces and hydrogen bonding interactions.
Hydrothermal reaction of terbium(Ⅲ) chloride with 5-sulfoisophthalic acid monosodium salt and 1,10-phenanthroline(phen) at 415 K resulted in the formation of a novel coordination polymer, [Tb(sip)(phen)(H2O)]n(sip=5-sulfoisophthalate trivalent anion) with a three-dimensional network structure. Each centrosymmetrically related pair of terbium ions are linked by two sip anions, forming a binuclear unit, and each binuclear unit links to four adjacent tetranuclear units, extending a two-dimensional hybrid layer at crystallographic bc plane. On the other hand, every three-terbium ion is connected by three sip anions, generating a trinuclear ring, and the trinuclear ring connects six neighboring trinuclear rings to produce another two-dimensional layer at crystallographic ab plane. Moreover, each sip anion acts as a pentadentate bridge, interconnecting two different types of layers to yield a novel three-dimensional framework.
