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Poly[triaquabis-(?(2)-3-carboxy-pyrazine-2-carboxyl-ato)dilithium(I)].

ABSTRACT: In the title compound, [Li(2)(C(6)H(3)N(2)O(4))(2)(H(2)O)(3)](n), the coordination number for both independent Li(+) cations is five. One of the Li(+) ions has a distorted trigonal-bipyramidal geometry, coordinated by one of the carboxyl O atoms of a 3-carboxy-pyrazine-2-carboxyl-ate ligand, two O atoms from two water mol-ecules, and an N and a carboxyl-ate O atom of a second 3-carboxy-pyrazine-2-carboxyl-ate ligand. The other Li(+) ion also has a distorted trigonal-bipyramidal geometry, coordinated by one water mol-ecule and two 3-carboxy-pyrazine-2-carboxyl-ate ligands through an N and a carboxyl-ate O atom from each. One of the carboxyl groups of the two ligands takes part in an intra-molecular O-H?O hydrogen bond. The stabilization of the crystal structure is further assisted by O-H?O, O-H?N and C-H?O hydrogen-bonding inter-actions involving the water mol-ecules and carboxyl-ate O atoms.

SUBMITTER: Tombul M

PROVIDER: S-EPMC2960851 | biostudies-other | 2008

REPOSITORIES: biostudies-other

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Poly[triaquabis-(μ(2)-3-carboxy-pyrazine-2-carboxyl-ato)dilithium(I)].

Tombul Mustafa M Güven Kutalmış K Büyükgüngör Orhan O

Acta crystallographica. Section E, Structure reports online 20080220 Pt 3

In the title compound, [Li(2)(C(6)H(3)N(2)O(4))(2)(H(2)O)(3)](n), the coordination number for both independent Li(+) cations is five. One of the Li(+) ions has a distorted trigonal-bipyramidal geometry, coordinated by one of the carboxyl O atoms of a 3-carboxy-pyrazine-2-carboxyl-ate ligand, two O atoms from two water mol-ecules, and an N and a carboxyl-ate O atom of a second 3-carboxy-pyrazine-2-carboxyl-ate ligand. The other Li(+) ion also has a distorted trigonal-bipyramidal geometry, coordin ...[more]

PMID: 21201874

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Poly[(?4-3-carb-oxy-pyrazine-2-carboxyl-ato)(?4-nitrato)dilithium].

Project description:In the title compound, [Li2(C6H3N2O4)2(NO3)] n , the two symmetry-independent Li(I) ions are each in a trigonal-bipyramidal coordination and are bridged by N,O-bonding ligands, forming mol-ecular ribbons propagating in [010]. Each Li(I) ion is also coordinated by two O atoms from nitrate ions, connecting the ribbons into a three-dimensional network. Very strong intra-molecular O-H?O hydrogen bonds occur between the carboxyl and the carboxylate group.

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Project description:The structural unit of the title compound, [Rb(C(6)H(3)N(2)O(4))(C(6)H(4)N(2)O(4))(H(2)O)(2)](n), consists of one rubidium cation, one hydrogen pyrazine-2,3-dicarboxyl-ate anion, one pyrazine-2,3-dicarboxylic acid mol-ecule and two water mol-ecules. This formulation is repeated twice in the asymmetric unit as the rubidium cation lies on an inversion centre. Each anion or acid mol-ecule is linked to two rubidium cations, while the rubidium cation has close contacts to four symmetry-equivalent organic ligands, with two different coordination modes towards this cation. In addition, each rubidium cation is coordinated by two water O atoms, raising the coordination number to eight. One of the carboxyl groups of the acid holds its H atom, which forms a hydrogen bond to a coordinated water mol-ecule. The other carboxyl group is deprotonated in half of the ligands and protonated in the other half, taking part in a strong O-H?O hydrogen bond disordered over an inversion centre. The stabil-ization of the crystal structure is further assisted by O-H?O and O-H?N hydrogen-bonding inter-actions involving the water mol-ecules and carboxyl-ate O atoms.

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Poly[?(2)-aqua-?(2)-(pyrazine-2-carboxyl-ato)-lithium].

Project description:The structure of the title compound, [Li(C(5)H(3)N(2)O(2))(H(2)O)](n), contains an Li(I) ion with a distorted trigonal-bipyramidal coordination environment involving the N and O atoms of pyrazine-2-carboxyl-ate ligands with a bridging carboxyl-ate group, and two aqua O atoms also in a bridging mode. The symmetry-related Li(I) ions bridged by a carboxyl-ate O atom and a coordinating water O atom form an Li(2)O(2) unit with an Li?Li distance of 3.052?(4)?Å, which generates mol-ecular ribbons propagating in the c-axis direction. The ribbons are held together by a network of O-H?O hydrogen bonds in which the coordinating water mol-ecules act as donors and the carboxyl-ate O atoms as acceptors.

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(2,2'-Bipyridine)bis-(3-carboxy-pyrazine-2-carboxyl-ato)copper(II) dihydrate.

Project description:The title six-coordinated distorted octa-hedral complex, [Cu(C(6)H(3)N(2)O(4))(2)(C(10)H(8)N(2))]·2H(2)O, consists of two 3-carboxy-pyrazine-2-carboxyl-ate anions and one 2,2'-bipyridine ligand. There is a twofold rotation axis positioned at the Cu(II) center. The N atoms of the pyrazine ring occupy the axial positions and two proton-transferred O atoms of tbe acid together with the two N atoms of the 2,2'-bipyridine ligand complete the equatorial plane. The inter-actions existing in the crystal structure are inter-molecular O-H⋯O hydrogen bonds, and C-H⋯O and C-O⋯π inter-actions (O⋯π =3.145 Å, C-O⋯π = 149.75°).

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Poly[di-?(2)-aqua-?(2)-(5-methyl-pyrazine-2-carboxyl-ato)-(5-methyl-pyrazine-2-carboxyl-ato)-?(3)-nitrato-trilithium].

Project description:The asymmetric unit of the title compound, [Li(3)(C(6)H(5)N(2)O(2))(2)(NO(3))(H(2)O)(2)](n) contains three Li(I) ions, two ligand anions, two water mol-ecules and a nitrate anion. Related by a centre of inversion, they form a centrosymmetric mol-ecular cluster in which one of the Li(I) ions shows trigonal-bipyramidal and the other two distorted tetra-hedral coordination. Li(I) ions are bridged by water O atoms and carboxyl-ate O atoms donated by one of the ligands. The clusters, bridged by two nitrato O atoms, form mol-ecular columns along [010], which are held together by O-H?O and O-H?N hydrogen bonds and ?-? inter-actions [centroid-centroid distances = 3.694?(1) and 3.796?(1)?Å].

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