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Bis(guanidinium) trans-diaqua-bis(malonato-?O,O')cobaltate(II).

ABSTRACT: In the title compound, (CH(6)N(3))(2)[Co(C(3)H(2)O(4))(2)(H(2)O)(2)], the anions lie on crystallographic centres of inversion. The crystal structure adopts a layered structure, stabilized by an extensive network of N-H?O and O-H?O hydrogen bonds. One H atom of the guanidinium cation does not participate in any strong hydrogen bonds.

SUBMITTER: Najafpour MM

PROVIDER: S-EPMC2915119 | biostudies-literature | 2007 Dec

REPOSITORIES: biostudies-literature

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Bis(guanidinium) trans-diaqua-bis(malonato-κO,O')cobaltate(II).

Najafpour M Mahdi MM Hołyńska Małgorzata M Lis Tadeusz T

Acta crystallographica. Section E, Structure reports online 20071218 Pt 1

In the title compound, (CH(6)N(3))(2)[Co(C(3)H(2)O(4))(2)(H(2)O)(2)], the anions lie on crystallographic centres of inversion. The crystal structure adopts a layered structure, stabilized by an extensive network of N-H⋯O and O-H⋯O hydrogen bonds. One H atom of the guanidinium cation does not participate in any strong hydrogen bonds. ...[more]

PMID: 21200534

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Diammonium diaqua-bis(malonato-?O,O')cobaltate(II) dihydrate.

Project description:The title complex, (NH(4))(2)[Co(C(3)H(3)O(4))(2)(H(2)O)(2)]·2H(2)O, features a six-coordinate Co atom located on a center of symmetry. The octa-hedral O(6) coordination geometry is defined by two bidentate malonate ligands and two water mol-ecules, with the latter in a trans configuration. The mol-ecules are linked through O-H?O and N-H?O hydrogen-bonding inter-actions, forming a three-dimensional supra-molecular network.

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Diacridinium trans-diaqua-bis(pyrazine-2,3-dicarboxyl-ato)cobaltate(II) hexa-hydrate.

Project description:The title compound, (C(13)H(10)N)(2)[Co(C(6)H(2)N(2)O(4))(2)(H(2)O)(2)]·6H(2)O, consists of mononuclear trans-[Co(pz-2,3-dc)(2)(H(2)O)(2)](2-) complex anions, (acrH)(+) cations and uncoordinated water mol-ecules (acr is acridine and pz-2,3-dcH(2) is pyrazine-2,3-dicarboxylic acid). The Co(II) atom, which lies on a crystallographic center of symmetry, has a slightly distorted octa-hedral coordination environment, with two N and two O atoms from the (pz-2,3-dc)(2-) ligands in the equatorial plane and with two water mol-ecules in axial positions. In the crystal, the components are held together by two distinct N-H?O and C-H?O hydrogen bonds with R(2) (2)(8) graph-sets. The coordinated and uncoordinated water mol-ecules are also involved in O-H?O hydrogen bonds, which lead to the formation of layers with R(3) (3)(12) graph-set motifs. Extensive ?-? stacking inter-actions between parallel aromatic rings of the acridinium ions, with distances ranging from 3.533?(1) to 3.613?(1)?Å, occur in the structure.

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Bis(2-amino-6-methyl-pyridinium) trans-diaqua-bis-(pyrazine-2,3-dicarboxyl-ato)cobaltate(II) octa-hydrate.

Project description:The title compound, (C(6)H(9)N(2))(2)[Co(C(6)H(2)N(2)O(4))(2)(H(2)O)(2)]·8H(2)O, was obtained by the reaction of CoCl(2)·6H(2)O with 1,4-pyrazine-2,3-dicarb-oxy-lic acid and 2-amino-6-methyl-pyridine in aqueous solution (molar ratio 1:2:2). The Co(II) ion is situated on an inversion centre and is coordinated by two O and two N atoms of two symmetry-related 1,4-pyrazine-2,3-dicarboxyl-ate ligands and two water mol-ecules and has a disorted octa-hedral coordination environment. The asymmetric unit also contains four water mol-ecules. In the crystal, extensive inter-molecular classical N-H⋯O, O-H⋯O and O-H⋯N hydrogen bonds and π-π stacking inter-actions [centroid-centroid distance = 3.490 (1) Å] connect the various components, forming a three-dimensional network.

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Imidazolium trans-bis-(imino-diacetato-κO,N,O')cobaltate(III).

Project description:In the title compound, (C(3)H(5)N(2))[Co(C(4)H(5)NO(4))(2)], the cation and anion are located on a twofold rotation axis and inversion center, respectively. Inter-molecular N-H⋯O hydrogen bonds link the cations and anions into layers parallel to the ab plane. The crystal packing also exhibits weak C-H⋯O hydrogen bonds, including bifurcated hydrogen bonds, and C=O⋯π inter-actions.

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Diammonium diaqua-bis(methyl-enediphospho-nato-?O,O')cobaltate(II).

Project description:In the salt, (NH(4))(2)[Co(CH(4)O(6)P(2))(2)(H(2)O)(2)], the methyl-ene-diphospho-nate acts as a bidentate ligand and the Co(II) ion (site symmetry ) assumes an octa-hedral CoO(6) coordination geometry. The acid H atom of the ligand is distributed over two O atoms. In the crystal, a three-dimensional network is formed through O-H?O and N-H?O hydrogen bonds between the cations and anions.

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Bis(2-amino-4-methyl-pyrimidin-3-ium) trans-diaqua-bis-(pyrazine-2,3-di-car-boxylato)cobaltate(II) hexa-hydrate.

Project description:In the crystal structure of the mononuclear title compound, (C(5)H(8)N(3))(2)[Co(C(6)H(2)N(2)O(4))(2)(H(2)O)(2)]·6H(2)O or (ampymH)(2)[Co(pyzdc)(2)(H(2)O)(2)]·6H(2)O (ampym = 2-amino-4-methyl pyrimidine, pyzdcH(2) = pyrazine-2,3-dicarb-oxy-lic acid), the Co(II) ion is hexa-coordinated by two (pyzdc)(2-) groups in the equatorial plane and two water mol-ecules in axial positions, giving an N(2)CoO(4) bound set. The (pyzdc)(2-) anion acts as a bidentate ligand through one carboxyl-ate group O atom and pyrazine ring N atom. There are diverse N-H⋯ O and O-H⋯O and O-H⋯N hydrogen-bonding inter-actions, which lead to the formation of a three-dimensional supra-molecular architecture. Off-set or slipped π-π stacking inter-actions are also observed between adjacent pyrimidine rings with face-to-face distances of 3.6337 (9) Å.

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Diaqua-bis(4-methyl-benzoato-κO)zinc(II).

Project description:The Zn atom in the title mononuclear complex, [Zn(C(8)H(7)O(2))(2)(H(2)O)(2)], lies on a special position of site symmetry 2. The carboxyl-ate group binds in a monodentate manner so that the geometry is best described as tetra-hedral. Adjacent mol-ecules are linked by O-H⋯O hydrogen bonds into a three-dimensional network.

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Diaqua-bis(2-carboxy-benzoato-κO)nickel(II).

Project description:In the title compound, [Ni(C(8)H(5)O(4))(2)(H(2)O)(2)], the Ni(II) atom lies on an inversion centre and exhibits a square-planar geometry incorporating two phthalate and two water O atoms. The nickel complex is stabilized by intra-molecular inter-actions involving water O atoms and H atoms of the phthalate groups. It forms one-dimensional zigzag chains along the b axis which are held together via π-π stacking inter-actions (3.647 Å) between the benzene rings of the phthalate groups. The adjacent chains are also hydrogen bonded, resulting in a three-dimensional supra-molecular network.

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