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In the title compound, [Cd(C(10)H(7)N(6))(2)(H(2)O)(2)], the Cd(II) atom lies on an inversion centre and is coordinated by four N atoms from 5-[4-(1H-imidazol-1-yl)phen-yl]tetra-zol-1-ide ligands and two O atoms from the coordinated water mol-ecules in an octa-hedral arrangement. The complex polymeric chains are inter-connected via inter-molecular water O-H⋯N hydrogen bonds into a three-dimensional network.

In the title complex, [Cd(C(8)H(9)N(2)O(4))(2)(H(2)O)(2)]·2C(3)H(7)NO, the six-coordinate Cd(II) ion is in a slightly distorted octa-hedral environment, defined by two O atoms from two coordinated water mol-ecules and two carboxyl-ate O atoms and two N atoms from two N,O-bidentate 5-carb-oxy-2-propyl-1H-imidazole-4-carboxyl-ate ligands. In the crystal, complex mol-ecules and dimethyl-formamide solvent mol-ecules are linked by O-H⋯O and N-H⋯O hydrogen bonds into a two-dimensional supra-molecular structure. The propyl groups of the ligands are disordered over two conformations with refined occupancies of 0.680 (7) and 0.320 (7).

In the title complex, {[Na(C(7)H(7)N(2)O(4))(H(2)O)(2)]·H(2)O}(n), the Na(I) atom exhibits a distorted octa-hedral geometry and is six-coordinated in an NO(5) environment. The equatorial plane is defined by three O atoms and one N atom from two distinct 5-carb-oxy-2-ethyl-1H-imidazole-4-carboxyl-ate (H(2)EIDC) ligands and one coordinated water mol-ecule, and the apical sites are occupied by one carboxyl O atom from one H(2)EIDC ligand and one O atom from the other coordinated water mol-ecule. The Na(I) atoms are linked by H(2)EIDC 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 supra-molecular network.

In the title complex, [Co(C(8)H(9)N(2)O(4))(2)(H(2)O)(2)]·2C(3)H(7)NO, the Co(II) cation (site symmetry ) is six-coordinated by two 5-carb-oxy-2-propyl-1H-imidazole-4-carboxyl-ate ligands and two water mol-ecules in a distorted octa-hedral environment. In the crystal structure, the complex mol-ecules and dimethyl-formamide solvent mol-ecules are linked by extensive O-H⋯O and N-H⋯O hydrogen bonding into sheets lying parallel to (21).

In the title complex, [Ca(C(10)H(6)NO(2))(2)(H(2)O)(2)](n), the Ca(II) ion is eight-coordinated by six carboxyl-ate O atoms from four separate quinoline-3-carboxyl-ate ligands, two of which are bidentate chelate and two bridging, and two water mol-ecules in a distorted square-anti-prismatic 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⋯O(carboxyl-ate) hydrogen bonds into a three-dimensional framework structure.

In the title complex, [Mn(C(8)H(9)N(2)O(4))(2)(H(2)O)(2)]·3.5H(2)O, the Mn(II) cation is six-coordinated by two N,O-bidentate H(2)pimda(-) ligands (H(2)pimda(-) = 5-carb-oxy-2-propyl-1H-imidazole-4-carboxyl-ate) and two water mol-ecules in a distorted octa-hedral environment. The complete solid-state structure can be described as a three-dimensional supra-molecular framework stabilized by a wide range of O-H⋯O and N-H⋯O hydrogen bonds. The propyl groups of H(2)pimda(-) are disordered over two sets of sites with refined occupancies of 0.759 (5):0.241 (5) and 0.545 (7):0.455 (7).

In the title complex, [Zn(C(8)H(9)N(2)O(4))(2)(H(2)O)(2)]·3.5H(2)O, the Zn(II) ion is coordinated by two N,O-bidentate H(2)pimda ligands (H(3)pimda = 2-propyl-1H-imidazole-4,5-dicarb-oxy-lic acid) and two water mol-ecules in a distorted octa-hedral environment. In the crystal structure, extensive inter-molecular O-H⋯O and N-H⋯O hydrogen bonds stabilize the three-dimensional supra-molecular network. Intra-molecular O-H⋯O hydrogen bonds between the carboxyl groups are also observed. The propyl groups of the two H(2)pimda ligands are disordered each over two sites, with occupancy factors of 0.752 (5):0.248 (5) and 0.519 (7):0.481 (7). One of the water mol-ecules is half-occupied.

In the title complex, [Cu(C(8)H(9)N(2)O(4))(2)(H(2)O)(2)]·2C(3)H(7)NO, the Cu(II) ion, lying on an inversion center, is six-coordinated in a slightly distorted octa-hedral geometry. Two N atoms and two O atoms from two H(2)pimda (H(3)pimda is 2-propyl-1H-4,5-dicarb-oxy-lic acid) ligands are in the equatorial plane. The axial positions are occupied by two O atoms from two water mol-ecules. A two-dimensional supra-molecular network parallel to (001) is constructed by N-H⋯O and O-H⋯O hydrogen bonds. An intra-molecular O-H⋯O hydrogen bond is also observed.

In the title complex, [Ni(C(8)H(9)N(2)O(4))(2)(H(2)O)(2)]·4H(2)O, the Ni(II) ion is coordinated in a slightly distorted octa-hedral environment formed by two bis-chelating H(2)pimda (H(3)pimda is 2-propyl-1H-4,5-dicarb-oxy-lic acid) ligands and two coordinated water mol-ecules. In the crystal structure, a three-dimensional framework is formed by inter-molecular O-H⋯O and N-H⋯O hydrogen bonds involving the solvent water mol-ecules, coordinated water mol-ecules, carboxyl-ate O atoms and the protonated N atoms of the H(2)pimda ligands. The propyl groups of each H(2)pimda ligand are disordered over two sets of sites with refined occupancies of 0.50 (2):0.50 (2) and 0.762 (11):0.238 (11). In one water solvent mol-ecule, one of the H atoms was refined as disordered over two sites of equal occupancy.

In the title compound, {[Cd(C(9)H(4)N(2)O(4))(C(3)H(7)NO)(H(2)O)]·2H(2)O}(n), the Cd(II) atom is coordinated by one N atom and three O atoms from four different 1H-benzimidazole-5,6-dicarboxyl-ate (Hbidc) ligands, one O atom from one dimethyl-formamide ligand, and one O atom from a water mol-ecule in a distorted octa-hedral geometry. The Hbidc ligands connect the Cd atoms into a two-dimensional network parallel to (001). N-H⋯O and O-H⋯O hydrogen bonds involving the water molecules are observed in the crystal structure.

In the title complex, [Ca(C(8)H(9)N(2)O(4))(2)(H(2)O)(2)](n), the Ca(II) atom is eight-coordinated in a distorted square-anti-prismatic environment. The water-coordinated Ca atom is N,O-chelated by the monocarboxyl-ate anion; the carboxyl -CO(2) portion engaged in chelation bears an acid hydrogen. The free -CO(2) portion engages in bonding to adjacent Ca atoms. The Ca(II) centres are connected through the ligand, forming a layer structure; the layers are linked by hydrogen bonds into a three-dimensional network.

The title compound, [Ni(C(9)H(45)N(2)O(4))(2)(H(2)O)(4)]·2C(3)H(7)NO·2H(2)O, has the Ni(II) center coordinated by four water mol-ecules and two N atoms from two 1H-benzimidazole-5,6-dicarboxyl-ate ligands in an octa-hedral geometry. The mol-ecule inter-acts with the solvent water and dimethyl-formamide mol-ecules through N-H⋯O and O-H⋯O hydrogen bonds to form a three-dimensional supra-molecular network. The metal atom lies on a center of inversion.

In the title complex, [Ni(C(9)H(4)N(2)O(4))(C(12)H(8)N(2))(H(2)O)(2)](n), the Ni(II) atom is hexa-coordinated by one N and one O atom from two different 1H-benzimidazole-5,6-dicarboxyl-ate ligands, two N atoms from one 1,10-phenanthroline ligand and two water mol-ecules. The flexible 1H-benzimidazole-5,6-dicarboxyl-ate ligands link the Ni(II) centres, forming an infinite zigzag chain parallel to [001]. The crystal packing is governed by inter-molecular hydrogen-bonding inter-actions of the O-H⋯O, N-H⋯O and C-H⋯O types.

In the title mononuclear complex, [Ni(C(9)H(4)N(2)O(4))(H(2)O)(5)]·5H(2)O, the Ni(II) atom is six-coordinated by one N atom from a 1H-benzimidazole-5,6-dicarboxyl-ate ligand and by five O atoms from five water mol-ecules and displays a distorted octa-hedral geometry. Inter-molecular O-H⋯O hydrogen-bonding inter-actions among the coordinated water mol-ecules, solvent water mol-ecules and carboxyl O atoms of the organic ligand and additional N-H⋯O hydrogen bonding lead to the formation of a three-dimensional supra-molecular network.