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metal-organic compounds
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In the title compound, [Li2(C6H3N2O4)2(NO3)]n, the two symmetry-independent LiI ions are each in a trigonal–bipyramidal coordination and are bridged by N,O-bonding ligands, forming molecular ribbons propagating in [010]. Each LiI ion is also coordinated by two O atoms from nitrate ions, connecting the ribbons into a three-dimensional network. Very strong intramolecular O—H
O hydrogen bonds occur between the carboxyl and the carboxylate group.
O hydrogen bonds occur between the carboxyl and the carboxylate group.metal-organic compoundsOpen access
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In the title compound, [Mg(C6H2N2O4)(H2O)4]·H2O, the MgII ion is coordinated by a fully deprotonated pyrimidine-4,6-dicarboxylate molecule, via a ring N and a carboxylate O atom, and by four water O atoms at the apices of a slightly distorted octahedron. In the crystal, molecules are linked by O—HO and O—HN hydrogen bonds, forming a three-dimensional network.
O and O—HN hydrogen bonds, forming a three-dimensional network.metal-organic compoundsOpen access
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In the monomeric title complex, [Li(C4H3N2O2)(H2O)3], the Li+ cation is coordinated by a pyrazole N atom and three water molecules in a distorted tetrahedral geometry. The carboxylate group is deprotonated. The complex molecules are involved in O—HO and N—HO hydrogen bonding, forming layers stacked along the b axis.
O and N—HO hydrogen bonding, forming layers stacked along the b axis.metal-organic compoundsOpen access
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The crystal structure of the title compound, [Li2(C4H2N3O4)2(H2O)4], contains centrosymmetric dinuclear molecules in which two LiI ions are bridged by two water O atoms. The metal ion is coordinated by one N,O-bidentate ligand and three water O atoms (one of them is symmetry generated), with one of the bridging water O atoms in the apical position of a distorted square pyramid. The carboxylate group that participates in coordination to the metal ion remains protonated; the other is deprotonated and coordination inactive. An intramolecular O—HO hydrogen bond between carboxylate groups is observed. In the crystal, dimers are linked by O—HO, O—HN and N—HO hydrogen bonds, generating a three-dimensional network.
O hydrogen bond between carboxylate groups is observed. In the crystal, dimers are linked by O—HO, O—HN and N—HO hydrogen bonds, generating a three-dimensional network.metal-organic compoundsOpen access
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The basic structural unit of the title polymeric ribbon, {[Li2(C5H3N2O2)2(H2O)2]·H2O}n, is a centrosymmetric dinuclear complex in which the two LiI ions are bridged by two carboxylato O atoms, to generate a centrosymmetric Li2O2 core. These are connected into a chain along [01-1] by carboxylic acid–carbonyl-O bonds. The tetrahedral coordination of the LiI cation is completed by an aqua ligand. The carboxylic acid is involved in an intra-ribbon hydrogen bond. A solvate water molecule showing positional (50:50) disorder is observed. Polymeric ribbons along [01-1] are connected by O—HO, N—HO and O—HN hydrogen bonds into a three-dimensional architecture.
O, N—HO and O—HN hydrogen bonds into a three-dimensional architecture.metal-organic compoundsOpen access
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The asymmetric unit of the title compound, [Li(C8H6N2O4)(H2O)]n, comprises three Li cations, two of which are located on a twofold rotation axis, two carboxylate anions and three water molecules, of which two are situated on the twofold rotation axis being aqua ligands. Both carboxylate anions are in μ2-bridging mode. All Li ions show a trigonal–bipyramidal coordination mode; the two located in special positions are bridged through N,O-bonding sites generating a polymeric ribbon along the c-axis direction. The Li cation in a general position creates an independent polymeric ribbon through N,O-bonding sites of the two symmetry-related ligands; the trigonal–bipyramidal coordination is completed by an aqua ligand. In both carboxylate anions, a carboxylate and a carboxylic acid group form an intramolecular hydrogen bond. The polymeric ribbons running along [001] are interconnected by hydrogen bonds in which the water molecules act as donors and carboxylate O atoms act as acceptors, giving rise to a three-dimensional architecture.
organic compoundsOpen access
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The crystal structure of the title compound, C5H4N2O2, is built of acid molecules located on a mirror plane. They form sheets stacked along the b-axis direction. The molecules interact via O—HN hydrogen bonds, forming [001] chains, and weak van der Waals interactions.
N hydrogen bonds, forming [001] chains, and weak van der Waals interactions.
