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Poly[[bis-{?2-1,2-bis-[(1H-imidazol-1-yl)meth-yl]benzene}(?4-9,10-dioxo-9,10-dihydro-anthracene-1,4,5,8-tetra-carbox-yl-ato)dicobalt(II)] dihydrate].

ABSTRACT: The title complex, {[Co2(C18H4O10)(C14H14N4)2]·2H2O} n was synthesized from CoCl2·6H2O, 9,10-dioxo-9,10-dihydro-anthracene-1,4,5,8-tetra-carb-oxy-lic acid (H4AQTC) and 1,2-bis-[(1H-imidazol-1-yl)meth-yl]benzene (o-bix) in water. The anthraquinone unit is located about a crystallographic center of inversion. Each asymmetric unit therefore contains one Co(II) atom and one o-bix ligand, as well as half an AQTC(4-) ligand and an additional solvent water mol-ecule. The Co(II) ions are tetra-hedrally surrounded by two O atoms from two AQTC(4-) anions and by two N atoms from two o-bix ligands, forming a two-dimensional coordination polymer. The solvent water mol-ecules are connected to the carboxyl-ate groups by O-H?O hydrogen bonds. Additional weak C-H?O hydrogen bonds are observed in the crystal structure.

SUBMITTER: Sheng XL

PROVIDER: S-EPMC3588523 | biostudies-literature | 2013 Mar

REPOSITORIES: biostudies-literature

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Poly[tetra-aqua-(?(6)-9,10-dioxo-9,10-dihydro-anthracene-1,4,5,8-tetra-carboxyl-ato)dimanganese(II)].

Project description:The title complex, [Mn(2)(C(18)H(4)O(10))(H(2)O)(4)](n), was synthesized from manganese(II) chloride tetra-hydrate and 9,10-dioxo-9,10-dihydro-anthracene-1,4,5,8-tetra-carb-oxy-lic acid (H(4)AQTC) in water. The anthraquinone unit is located about a crystallographic center of inversion. Each asymmetric unit therefore contains one Mn(II) atom, two water ligands and one half AQTC(4-) anion. The Mn(II) atom is coordinated in a distorted octa-hedral geometry by four O atoms from three AQTC(4-) ligands and two water O atoms. Two of the carboxyl-ate groups coordinate one Mn(II) atom in a chelating mode, whereas the others each coordinate two Mn(II) atoms. Each AQTC(4-) tetra-anion therefore coordinates six different Mn(II) ions and, as a result, a three-dimensional coordination polymer is formed. O-H?O hydrogen bonds, some of them bifurcated, between water ligands and neighboring water or anthraquinone ligands are observed in the crystal structure.

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Project description:The title compound, C(8)H(12)Br(2)O(4), is a bicyclic ketal in which the two six-membered rings are cis to one another and assume a double-chair conformation. A crystallographic twofold axis bisects the molecule.

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| S-EPMC2915252 | biostudies-literature

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Project description:In the crystal of the title polymeric complex, [Ni(2)(C(18)H(4)O(10))(C(10)H(8)N(2))(H(2)O)(8)](n), each Ni(II) cation is coord-in-ated by four water mol-ecules in the equatorial plane, and is further bridged by an 9,10-dioxo-9,10-dihydro-anthracene-1,4,5,8-tetra-carb-oxy-l-ate anion and a 4,4'-bipyridine ligand in the axial directions, forming a distorted octa-hedral geometry. The 9,10-dioxo-9,10-dihydro-anthracene-1,4,5,8-tetra-carboxyl-ate anion is centrosymmetric with the centroid of the quinone ring located about an inversion center; the 4,4'-bipyridine ligand is also centrosymmetric with the mid-point of the C-C bond linking two pyridine rings located about another invertion center. The 9,10-dioxo-9,10-dihydro-anthracene-1,4,5,8-tetra-carboxyl-ate anion and bypiridine ligand bridge the Ni(II) cations, forming a polymeric chain along the b axis. ?-? stacking is observed between pyridine and benzene rings [centroid-centroid distance = 3.705?(2)?Å]. All of the coordinating water mol-ecules are involved in O-H?O hydrogen bonding.

| S-EPMC3393213 | biostudies-literature

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Project description:In the title compound, [Co(2)(C(8)H(10)O(4))(2)(C(14)H(14)N(4))](n), the two Co(II) atoms are both five-coordinated by four carboxyl-ate O atoms, derived from two different cyclo-hexane-1,4-dicarboxyl-ate (chdc) ligands, and an N atom, derived from one end of a 1,4-bis-(imidazol-1-ylmeth-yl)benzene mol-ecule (1,4-bix), in a distorted square-pyramidal environment. Each end of the chdc ligand links pairs of Co(II) atoms into a paddle-wheel assembly, i.e. Co(2)(O(2)CR')(4); these are connected into rows because of the bridging nature of the chdc ligands, and the rows are further connected into a two-dimensional layer through the 1,4-bix ligands. The 1,4-bix ligand, which is disposed about a centre of inversion, is disorderd. Two positions were discerned for the -CH(2)(C(6)H(4))CH(2)- residue, with the major component having a site-occupancy factor of 0.512?(9).

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| S-EPMC2969754 | biostudies-literature

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Project description:In the title compound, C(18)H(12)O(5), the anthracene moiety is almost planar (r.m.s. deviation = 0.0399?Å). In the crystal, mol-ecules are linked to each other by inter-molecular O-H?O and weak C-H?O hydrogen bonds.

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