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Diguanidinium bis-(μ-2-hydroxy-propane-1,2,3-tricarboxyl-ato)bis-[diaqua-zincate(II)] dihydrate.

ABSTRACT: The asymmetric unit of the title compound, (CH(6)N(3))(2)[Zn(2)(C(6)H(5)O(7))(2)(H(2)O)(2)]·2H(2)O, contains one-half of a centrosymmetric dizinc(II) complex anion, one guanidinium cation and one water mol-ecule. Each Zn(II) ion is hexa-coordinated by two citrate anions, one in a bidentate fashion and the second monodentate, and two water mol-ecules in a distorted octa-hedral geometry. Intra-molecular O-H⋯O hydrogen bonds add further stability to the mol-ecular structure. In the crystal structure, mol-ecules are linked into a three-dimensional framework by inter-molecular N-H⋯O, O-H⋯O and C-H⋯O hydrogen bonds.

SUBMITTER: Al-Dajani MT

PROVIDER: S-EPMC2979955 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Poly[piperazinediium [aqua-bis(μ-pyridine-2,5-dicarboxyl-ato)zincate] dihydrate].

Project description:The polymeric title compound, {(C(4)H(12)N(2))[Zn(C(7)H(3)NO(4))(2)(H(2)O)]·2H(2)O}(n), was obtained by the reaction of zinc(II) nitrate hexa-hydrate with the proton-transfer compound (pipzH(2))(py-2,5-dc) (where pipz is piperazine and py-2,5-dcH(2) is pyridine-2,5-dicarboxylic acid) in aqueous solution. Each Zn(II) atom is coordinated in a distorted octa-hedral geometry by four O atoms and two N atoms from one water mol-ecule and two (py-2,5-dc)(2-) ligands, which also act as bridging ligands between Zn(II) atoms. π-π Stacking inter-actions between two aromatic rings of (py-2,5-dc)(2-) fragments, with centroid-centroid distances of 3.4747 (7) and 3.7081 (7) Å are observed. The crystal structure is stabilized by O-H⋯O and N-H⋯O hydrogen bonds.

| S-EPMC2915064 | biostudies-literature

catena-Poly[[[diaqua-iron(II)]-μ-pyrazine-2,3-dicarboxyl-ato] dihydrate].

Project description:The crystal structure of the title compound, {[Fe(C(6)H(2)N(2)O(4))(H(2)O)(2)]·2H(2)O}(n), was synthesized by a diffusion method. It has a one-dimensional polymeric chain structure and the chains are further connected into a three-dimensional structure by hydrogen bonds. The Fe(II) ion has a distorted octa-hedral coordination environment, with two N and two O atoms from the pyrazine-2,3-dicarboxyl-ate ligands in the equatorial plane and with two water mol-ecules in axial positions. The Fe atom lies on a crystallographic centre of symmetry and a twofold rotation axis passes through the pyrazine ring.

| S-EPMC2915058 | biostudies-literature

Poly[[diaqua-bis-(μ(3)-3-carboxyl-ato-4-hy-droxy-benzene-sulfonato)-tri-μ(2)-pyrazine-tetra-silver(I)] dihydrate].

Project description:The title coordination polymer, {[Ag(4)(C(7)H(4)O(6)S)(2)(C(4)H(4)N(2))(3)(H(2)O)(2)]·2H(2)O}(n), contains two independent Ag(I) ions. One Ag(I) ion is coordinated by one O atom from a 3-carboxyl-ato-4-hy-droxy-benzene-sulfonate (L) ligand, two N atoms from two pyrazine ligands and a water mol-ecule. The other Ag(I) ion is coordinated by two O atoms from two L ligands and one N atom from a pyrazine ligand. One of the pyrazine ligands lies on an inversion center. The L and pyrazine ligands link the Ag(I) ions into polymeric layers parallel to the ac plane. The layers are connected by inter-molecular O-H⋯O hydrogen bonds. An intra-molecular O-H⋯O hydrogen bond is also present in the L ligand.

| S-EPMC3246968 | biostudies-literature

Bis(1-methyl-4-oxoimidazolidin-2-iminium) diaqua-bis-(pyridine-2,4-dicarboxyl-ato-?N,O)zincate(II) dihydrate.

Project description:In the title compound, (C(4)H(8)N(3)O)(2)[Zn(C(7)H(3)NO(4))(2)(H(2)O)(2)]·2H(2)O, the Zn(II) ion is six-coordinated in a distorted octa-hedral geometry by two pyridine-2,4-dicarboxyl-ate (pydc) ligands in the equatorial plane and two water mol-ecules in the axial positions. The pydc ligands act as bidentate chelating ligands through one carboxyl-ate O atom and the pyridine N atom. Inter-molecular N-H?O, O-H?O and weak C-H?O hydrogen bonds stabilize the crystal structure.

| S-EPMC3099900 | biostudies-other

Diaqua-bis(pyrazine-2-carboxyl-ato-κN,O)manganese(II) dihydrate.

Project description:In the title compound, [Mn(C(5)H(3)N(2)O(2))(2)(H(2)O)(2)]·2H(2)O, the Mn(II) atom, lying on an inversion centre, has a distorted octa-hedral environment and the molecules are linked by O-H⋯O and N-H⋯O hydrogen bonds to form a three-dimensional supra-molecular structure.

| S-EPMC2961000 | biostudies-literature

Bis(μ-5-carboxyl-ato-1-carboxyl-ato-methyl-2-oxidopyridinium)-κO:O;κO:O-[diaqua-(phenan-throline-κN,N')manganese(II)] dihydrate.

Project description:The centrosymmetric binuclear title complex, [Mn(2)(C(8)H(5)NO(5))(2)(C(12)H(8)N(2))(2)(H(2)O)(4)]·2H(2)O, was obtained by the reaction of manganese chloride with 5-carb-oxy-1-carboxy-methyl-2-oxidopyridinium and 1,10-phenanthroline. The Mn(II) atom is coordinated by two N atoms from the 1,10-phenanthroline ligand, two O atoms from two 5-carboxyl-ato-1-carboxyl-atomethyl-2-oxidopyridinium ligands and two water mol-ecules, leading to a distorted octahedral MnN(2)O(4) environment. Inter-molecular O-H⋯O hydrogen bonds link neighbouring mol-ecules into a layer structure parallel to (001).

| S-EPMC2969745 | biostudies-literature

catena-Poly[[[diaqua-thulium(III)]-μ-6-carboxy-nicotinato-μ-pyridine-2,5-di-carboxyl-ato] dihydrate].

Project description:The title compound, {[Tm(C(7)H(3)NO(4))(C(7)H(4)NO(4))(H(2)O)(2)]·2H(2)O}(n), is isotypic with the analogous Tb(III) compound [Li et al. (2009 ▶). Acta Cryst. E65, m410]. All interatomic distances and angles and the hydrogen-bond geometries are very similar for the two structures. The refined Flack parameter of 0.49 (2) suggests inversion twinning.

| S-EPMC2968913 | biostudies-literature

catena-Poly[[[diaqua-terbium(III)]-μ-6-carboxy-nicotinato-μ-pyridine-2,5-di-carboxyl-ato] dihydrate].

Project description:The title compound, {[Tb(C(7)H(3)NO(4))(C(7)H(4)NO(4))(H(2)O)(2)]·2H(2)O}(n), is isotypic with the analogous Tm(III) compound [Li, Zhang, Wang & Bai (2009). Acta Cryst. E65, m411]. The Tb(III) atom is octa-coordinated by two water mol-ecules and by four carboxyl-ate O atoms and two pyridyl N atoms from two pyridine-2,5-dicarboxyl-ate (2,5-pydc) and two 6-carboxy-nicotinate (2,5-Hpydc) ligands. The 2,5-pydc and 2,5-Hpydc ligands bridge Tb(III) atoms, generating helical coordination polymers along [001]. An extensive network of O-H⋯O hydrogen bonds is formed between the coordination polymers and the uncoordinated water mol-ecules. The refined Flack parameter of 0.54 (2) suggests inversion twinning.

| S-EPMC2968984 | biostudies-literature

Poly[[hexa-?-aqua-diaqua-bis-(??-dihydrogen benzene-1,2,4,5-tetra-carboxyl-ato)magnesiumdisodium] dihydrate].

Project description:The asymmetric unit of the title compound, {[MgNa?(C??H?O?)?(H?O)?]·2H?O}(n), contains one octa-hedrally coordin-ated Mg(II) atom (site symmetry 2/m), one octahedrally coordinated Na(I) atom (site symmetry 2) and one half of the dihydrogen benzene-1,2,4,5-tetra-carboxyl-ate (btec) ligand, the second half of the ligand being generated by a twofold rotation axis. The basic framework of the title compound features infinite (-Na-Na-Mg-)(n) chains along [10-1] with the metal cations bridged by the coordinating water molecules. The chains are isolated from each other by ??-bridging btec ligands, which form inter-molecular O-H?O hydrogen bonds to uncoordinated water mol-ecules and the coordinated water mol-ecules of a neighbouring chain. In each btec ligand, there are also intramolecular O-H?O hydrogen bonds.

| S-EPMC3393174 | biostudies-literature

Diaqua-bis-(5-methyl-pyrazine-2-carboxyl-ato-?N,O)cobalt(II) dihydrate.

Project description:In the title complex, [Co(C(6)H(5)N(2)O(2))(2)(H(2)O)(2)]·2H(2)O, the coordination geometry of the Co(2+) cation is distorted octa-hedral, with two N atoms and two O atoms from two 5-methyl-pyrazine-2-carboxyl-ate ligands in the equatorial plane. The two remaining coordination sites are occupied by two water mol-ecules. In addition, there are two uncoordinated water mol-ecules in the asymmetric unit. The crystal structure is stabilized by a network of O-H?O and O-H?N hydrogen-bonding inter-actions, forming a three-dimensional structure.

| S-EPMC3201376 | biostudies-literature

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