Shi-Jie Li

Poly[[[diaqua­sodium]-μ3-5-carb­oxy-2-ethyl-1H-imidazole-4-carboxyl­ato-κ4 N 3,O 4:O 5:O 5] monohydrate]

In the title complex, {[Na(C7H7N2O4)(H2O)2]·H2O}n, the NaI atom exhibits a distorted octahedral geometry and is six-coordinated in an NO5 environment. The equatorial plane is defined by three O atoms and one N atom from two distinct 5-carboxy-2-ethyl-1H-imidazole-4-carboxylate (H2EIDC) ligands and one coordinated water molecule, and the apical sites are occupied by one carboxyl O atom from one H2EIDC ligand and one O atom from the other coordinated water molecule. The NaI atoms are linked by H2EIDC ligands, generating an infinite double chain along the a axis. These chains are further connected via O—H⋯O and N—H⋯O hydrogen bonds into a three-dimensional supramolecular network.

Diaqua­bis­(5-carb­oxy-2-propyl-1H-imidazole-4-carboxyl­ato-κ2N3,O4)manganese(II) 3.5-hydrate

In the title complex, [Mn(C8H9N2O4)2(H2O)2]·3.5H2O, the MnII cation is six-coordinated by two N,O-bidentate H2pimda− ligands (H2pimda− = 5-carboxy-2-propyl-1H-imidazole-4-carboxylate) and two water molecules in a distorted octahedral environment. The complete solid-state structure can be described as a three-dimensional supramolecular framework stabilized by a wide range of O—H⋯O and N—H⋯O hydrogen bonds. The propyl groups of H2pimda− are disordered over two sets of sites with refined occupancies of 0.759u2005(5):0.241u2005(5) and 0.545u2005(7):0.455u2005(7).

Pentaaqua(1H-benzimidazole-5,6-dicarboxylato-κN3)copper(II) pentahydrate

The title compound, [Cu(C9H4N2O4)(H2O)5]·5H2O, contains one crystallographically independent CuII atom and one 1H-benzimidazole-5,6-dicarboxylate (bdc) ligand, along with five coordinated and five uncoordinated water molecules. The CuII atom is six-coordinated by one N atom from the bdc ligand and five O atoms from water molecules, giving an octahedral coordination geometry. Hydrogen bonds link the mononuclear complex and uncoordinated water molecules into a three-dimensional network.

catena-Poly[[diaqua­(1,10-phenanthroline-κ2N,N′)nickel(II)]-μ-1H-benzimidazole-5,6-dicarboxyl­ato-κ2N3:O6]

In the title complex, [Ni(C9H4N2O4)(C12H8N2)(H2O)2]n, the NiII atom is hexacoordinated by one N and one O atom from two different 1H-benzimidazole-5,6-dicarboxylate ligands, two N atoms from one 1,10-phenanthroline ligand and two water molecules. The flexible 1H-benzimidazole-5,6-dicarboxylate ligands link the NiII centres, forming an infinite zigzag chain parallel to [001]. The crystal packing is governed by intermolecular hydrogen-bonding interactions of the O—H⋯O, N—H⋯O and C—H⋯O types.

Diaqua­bis(5-carb­oxy-2-propyl-1H-imidazole-4-carboxyl­ato-κ2N3,O4)nickel(II) N,N-dimethyl­formamide disolvate

In the title complex, [Ni(C8H9N2O4)2(H2O)2]·2C3H7NO, the NiII atom is six-coordinated by two N,O-bidentate 5-carboxy-2-propyl-1H-imidazole-4-carboxylate ligands and two water molecules in a distorted octahedral environment. The methyl C and H atoms of the two ligands are disordered over two sets of sites in 0.74u2005(2):0.26u2005(2) and 0.57u2005(8):0.43u2005(8) ratios. A supramolecular network is stabilized by intra- and intermolecular N—H⋯O and O—H⋯O hydrogen bonds involving the ligands, coordinated water molecules and dimethylformamide solvent molecules.

catena-Poly[[diaqua­calcium(II)]-bis­(μ-quinoline-3-carboxyl­ato)]

In the title complex, [Ca(C10H6NO2)2(H2O)2]n, the CaII ion is eight-coordinated by six carboxylate O atoms from four separate quinoline-3-carboxylate ligands, two of which are bidentate chelate and two bridging, and two water molecules in a distorted square-antiprismatic geometry. The bridging groups form a polymeric chain substructure extending along the c axis, the chains being connected by coordinated-water O—H⋯N and O—H⋯Ocarboxylate hydrogen bonds into a three-dimensional framework structure.

Tetra­aquabis(6-carboxy-1H-benzimid­azole-5-carboxyl­ato-κN 3)nickel(II) dimethyl­formamide disolvate dihydrate

The title compound, [Ni(C9H45N2O4)2(H2O)4]·2C3H7NO·2H2O, has the NiII center coordinated by four water molecules and two N atoms from two 1H-benzimidazole-5,6-dicarboxylate ligands in an octahedral geometry. The molecule interacts with the solvent water and dimethylformamide molecules through N—H⋯O and O—H⋯O hydrogen bonds to form a three-dimensional supramolecular network. The metal atom lies on a center of inversion.

3-Carb-oxy-5-(pyridinium-4-yl)benzoate: a redetermination.

The title compound, C13H9NO4, crystallizes in a zwitterionic form with the pyridine N atom protonated and the carboxyl OH group deprotonated. The benzene and pyridinium rings are inclined with a dihedral angle of 31.42u2005(14)° between them. A previous report of this stucture claims, we believe incorrectly, that neither of the carboxylate groups is deprotonated [Zhang et al. (2010 ▶). Acta Cryst. E66, o2928–o2928]. In the crystal, intermolecular O—H⋯O, N—H⋯O and weak C—H⋯O hydrogen-bonding interactions link adjacent molecules into a three-dimensional supramolecular network.

2-Ethyl-1H-imidazole-4-carboxyl-ate monohydrate.

In the title compound, C7H8N2O4·H2O, the imidazole N atom is protonated and one of the carboxylate groups is deprontonated, forming a zwitterion. The two carboxyl groups are are approximately coplanar with the imidazole ring [O—C—C—C torsion angles = −176.8u2005(2) and 2.9u2005(4)° for one group and −4.6u2005(3) and 176.4u2005(2)° for the other] and have an intramolecular O—H⋯O hydrogen bond between them. The water molecule is linked to the organic molecules via an N—H⋯O hydrogen bonds. Intermolecular O—H⋯O and N—H⋯O hydrogen bonds are found in the crystal structure.

Diaqua-bis-(5-carb-oxy-2-propyl-1H-imidazole-4-carboxyl-ato-κN,O)cobalt(II) 3.5-hydrate.

In the title complex, [Co(C8H9N2O4)2(H2O)2]·3.5H2O, the CoII cation is six-coordinated by two H2pimda− ligands (H3pimda is 2-propyl-1H-imidazole-4,5-carboxylic acid) and two water molecules in a distorted octahedral environment. The crystal structures features a three-dimensional network stabilized by extensive O—H⋯O and N—H⋯O hydrogen bonds. The propyl groups of the ligands are disordered over two sets of sites with refined occupancies of 0.673u2005(8):0.327u2005(8) and 0.621u2005(17):0.379u2005(17). One of the water molecules is located on a site with half-occupancy.