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Penta-aqua-(4,6-dihy-droxy-benzene-1,3-disulfonato-?O(1))zinc penta-hydrate.

ABSTRACT: The Zn(II) atom in the title complex, [Zn(C(6)H(4)O(8)S(2))(H(2)O)(5)]·5H(2)O, is coordinated by five water mol-ecules and an O atom of a 4,6-dihy-droxy-benzene-1,3-disulfonate dianion. The coord-ination geometry is distorted octa-hedral, with the Zn-O(sulfonate) bond relatively long compared to the Zn-O(water) bonds. The coordinated and lattice water mol-ecules inter-act with each other and with the hy-droxy groups and sulfonate ligand through O-H?O hydrogen bonds, generating a tightly held three-dimensional network.

SUBMITTER: Zhu ZB

PROVIDER: S-EPMC3343881 | biostudies-other | 2012 Apr

REPOSITORIES: biostudies-other

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Poly[aqua-(?(11)-4,6-dihy-droxy-benzene-1,3-disulfonato)-dipotassium].

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Triaqua-(benzene-1,3-dicarboxyl-ato)(4,5-diaza-fluoren-9-one)cadmium(II) penta-hydrate.

Project description:In the title compound, [Cd(C(8)H(4)O(4))(C(11)H(6)N(2)O)(H(2)O)(3)]·5H(2)O, the Cd(II) atom is seven-coordinated by two N atoms from one bidentate phenanthroline-derived ligand and by five O atoms, two from one bidentate benzene-1,3-dicarboxyl-ate (1,3-BDC) ligand and three from water mol-ecules, in a distorted penta-gonal-bipyramidal geometry. Neighbouring units inter-act through ?-? inter-actions [centroid-centroid distances = 3.380?(3) and 3.283?(4)?Å]. Finally, three types of O-H?O hydrogen bonds exist between coordinated dissociative water mol-ecules and hybridization water mol-ecules and carboxyl-ate O atoms, resulting in a two-dimensional network parallel to (010).

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Project description:The mol-ecule of the title compound, C(6)H(6)N(4)O(4), is almost planar, being stabilized by two intra-molecular N-H⋯O hydrogen bonds. Further N-H⋯O links lead to a sheet in the crystal structure.

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Project description:In the polymeric title compound, {[Ho(2)(C(6)H(2)O(4))(3)(H(2)O)(6)]·18H(2)O}(n), the Ho(III) ion is nine-coordinated by six O atoms derived from three bidentate 2,5-dihy-droxy-1,4-benzoquinonate (DHBQ(2-)) ligands and three O atoms from three water mol-ecules. The Ho(III) ions are connected via three ligands, resulting in the formation of a two-dimensional honeycomb layer parallel to the ab plane. The layer is racemic in which Δ- and Λ-coordination geometries around Ho(III) ions are alternately arranged. The asymmetric unit comprises a third of a Ho(III) ion, located on a threefold axis, one-half of a DHBQ(2-) ion, located on a centre of inversion, one coordinated water mol-ecule and three uncoordinated water mol-ecules.

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Tetra-aqua-bis(2-methyl-benzimidazolium-1,3-diacetato-κO)zinc(II) tetra-hydrate.

Project description:The asymmetric unit of the title compound, [Zn(C(12)H(11)N(2)O(4))(2)(H(2)O)(4)]·4H(2)O, contains one-half of the complex mol-ecule and two uncoordin-ated water mol-ecules. The four water O atoms in the equatorial plane around the Zn(II) centre ( symmetry) form a distorted square-planar arrangement, while the distorted octa-hedral coordination geometry is completed by the O atoms of the zwitterionic 2-methyl-benzimidazolium-1,3-diacetate ligands in the axial positions. The benzimidazole ring system is planar, with a maximum deviation of 0.041 (3) Å. Intra-molecular O-H⋯O hydrogen bonding results in the formation of a non-planar six-membered ring. In the crystal structure, strong intra- and inter-molecular O-H⋯O hydrogen bonds link the mol-ecules into a three-dimensional network. π-π contacts between benzimidazole rings [centroid-centroid distance = 3.899 (1) Å] may further stabilize the structure.

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