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1.  (1H-Benzimidazole-5-carb­oxy­lic acid-κN 3)(1H-benzimidazole-6-carb­oxy­lic acid-κN 3)silver(I) perchlorate 
The reaction of 1H-benzimidazole-5-carb­oxy­lic acid with silver nitrate in the presence of perchloric acid under hydro­thermal conditions yielded the title complex, [Ag(C8H6N2O2)2]ClO4, which comprises of an [Ag(C8H6N2O2)2] mononuclear cation and a perchlorate anion. The AgI ion is coordinated by two N atoms from two different neutral 1H-benzimidazole-5-carb­oxy­lic acid ligands with an N—Ag—N bond angle of 163.21 (14)°, forming an [Ag(C8H6N2O2)2] mononuclear cation. Although both ligands in the mononuclear cation are monodentate with one N atom coordinated to the metal ion, they are different: one is N3 coordinated to the Ag I ion and the N1 atom protonated, the other with the N1 coordinated to the Ag I ion and the N3 atom protonated (and thus formally a 1H-benzimidazole-6-carb­oxy­lic acid rather than a 1H-benzimidazole-5-carb­oxy­lic acid ligand). The planes of the two planar ligands are roughly perpendicular, making a dihedral angle of 84.97 (2)°. The packing of the ions is stablized by extensive O—H⋯O, N—H⋯O and C—H⋯O hydrogen bonds, and by remote Ag⋯O inter­actions [3.002 (3), 3.581 (5) and 3.674 (5) Å].
doi:10.1107/S1600536811010427
PMCID: PMC3099977  PMID: 21754004
2.  Poly[di-μ9-citrato-tetra­sodiumzinc] 
In the title compound, [Na4Zn(C6H5O7)2]n, the ZnII ion lies on an inversion center and is coordinated by six O atoms from two citrate ligands, forming a distorted octa­hedral geometry. There are two crystallographically independent Na+ cations in the asymmetric unit. One Na+ cation exhibits a distorted square-pyramidal geometry defined by five O atoms from four citrate ligands. The other Na+ cation is surrounded by six O atoms from five citrate ligands in a distorted octa­hedral geometry. The Na+ cations are bridged by citrate carboxyl­ate groups, forming a layer parallel to (100). The layers are further assembled into a three-dimensional network with the [Zn(citrate)2]4− building units as ‘pillars’; O—H⋯O hydrogen bonds also stabilize the structure.
doi:10.1107/S1600536813030067
PMCID: PMC3885003  PMID: 24454178
3.  Poly[[μ7-l-cysteato(2−)]disodium] 
The title compound {systematic name: poly[[μ7-(2R)-2-amino-3-sulfonato­propano­ato]disodium]}, [Na2(C3H5NO5S)]n, was obtained through solvent-thermal reaction of l-cysteic acid and aqueous sodium hydroxide. The monomer consists of two Na+ cations that are coordinated to the deprotonated amino acid. The latter acts as donor utilizing all available coordination sites, viz. the amino, the carboxyl­ate and the sulfonate residues, so producing a monomeric framework in which the two coordinated Na+ ions have different coordination spheres and geometries. One of the Na+ ions has an O5 coordination sphere with a typical geometric arrangement, inter­mediate between trigonal–bipyramidal and square–pyramidal; all the O atoms from the amino acid (three from the sulfonate and two from the caboxylate residues) act as donors. The second Na+ ion is tetracoordinated within an NO3 coordination sphere. The Na+ ion binds to the amino N atom, to one of the O atom of the carb­oxy­lic residue and to two O atoms of the sulfonate group in a distorted tetra­hedral arrangement. As the sulfonate O atoms bind to both Na+ ions, a three-dimensional polymeric framework is obtained.
doi:10.1107/S1600536811035525
PMCID: PMC3201222  PMID: 22058689
4.  Phenyl­hydrazinium (6-carb­oxy­pyridine-2-carboxyl­ato)(pyridine-2,6-dicarboxyl­ato)cobaltate(II)–pyridine-2,6-dicarb­oxy­lic acid–water (1/1/3) 
The asymmetric unit of the title compound, (C6H9N2)[Co(C7H3NO4)(C7H4NO4)]·C7H5NO4·3H2O, contains one (6-carb­oxy­pyridine-2-carboxyl­ato)(pyridine-2,6-dicarboxyl­ato)cobaltate(II) anion, one phenyl­hydrazinium cation, one pyridine-2,6-dicarb­oxy­lic acid mol­ecule and three uncoordin­ated water mol­ecules, part of which are disordered. The CoII ion is coordinated by a pyridine-2,6-dicarboxyl­ate ion and a 6-carb­oxy­pyridine-2-carboxyl­ate ligand almost perpendicular to each other [the angle between the least-squares planes is 87.38 (4)°] and is surrounded by two O atoms and two N atoms in the equatorial plane and two O atoms in axial positions, resulting in a distorted octa­hedral coordination geometry. There is an extensive three-dimensional network of O—H⋯O and N—H⋯O hydrogen bonds, which link the components.
doi:10.1107/S1600536810048191
PMCID: PMC3011730  PMID: 21589313
5.  Diaqua­bis­{5-carb­oxy-2-[(1H-1,2,4-triazol-1-yl)meth­yl]-1H-imidazole-4-carboxyl­ato}zinc 
In the title compound, [Zn(C8H6N5O4)2(H2O)2], the six-coordinate ZnII ion, which is located on an inversion center, has a distorted octa­hedral configuration. Each 5-carb­oxy-2-[(1H-1,2,4-triazol-1-yl)meth­yl]-1H-imidazole-4-carboxyl­ate ligand chelates to the ZnII ion through a triazole N atom and a carboxyl­ate O atom in the equatorial plane. The coordination sphere is completed by two water mol­ecules in axial positions. There is an intra­molecular O—H⋯O hydrogen bond in the ligand. In the crystal, mol­ecules are linked via inter­molecular O—H⋯O, O—H⋯N and N—H⋯N hydrogen bonds, forming a three-dimensional structure.
doi:10.1107/S160053681104387X
PMCID: PMC3238584  PMID: 22199475
6.  (3-Carb­oxy-5-sulfonatobenzoato-κ2 O 1,O 1′)bis­[2-(2-pyrid­yl)-1H-benzimidazole-κ2 N 2,N 3]zinc(II) monohydrate 
In the title compound, [Zn(C8H4O7S)(C12H9N3)2]·H2O, the ZnII atom has a distorted octa­hedral coordination geometry, defined by four N atoms from two 2-(2-pyrid­yl)-1H-benzimidazole ligands and two O atoms from a deprotonated carboxyl­ate group of the 3-carb­oxy-5-sulfonatobenzoate ligand. In the crystal structure, the complex mol­ecules are linked into a three-dimensional network by inter­molecular O—H⋯O and N—H⋯O hydrogen bonds, and π–π stacking inter­actions with centroid–centroid separations of 3.758 (2) and 3.597 (1) Å.
doi:10.1107/S1600536809009180
PMCID: PMC2968999  PMID: 21582356
7.  Bis[4-amino-3,5-bis­(pyridin-2-yl)-4H-1,2,4-triazole-κ2 N 2,N 3]bis­(benzene-1,2-dicarb­oxy­lic acid-κO)copper(II) bis­(2-carb­oxy­benzoate) 
In the complex cation of the title salt, [Cu(C12H10N6)2(C8H6O4)2](C8H5O4)2, the CuII atom, lying on an inversion center, exhibits a distorted octa­hedral geometry defined by four N atoms from two 4-amino-3,5-bis­(pyridin-2-yl)-4H-1,2,4-triazole ligands in the equatorial plane and two axial O atoms from two benzene-1,2-dicarb­oxy­lic acid ligands. In the crystal, the complex cations and the monodeprotonated 2-carb­oxy­benzoate anions are connected by O—H⋯O and N—H⋯O hydrogen bonds, forming a tape along [100]. Adjacent tapes are further linked into a three-dimensional arrangement via π–π stacking inter­actions between the triazole and benzene rings and between the pyridine and benzene rings [centroid–centroid distances = 3.6734 (14)/3.9430 (16) and 3.8221 (14) Å]. Intra­molecular N—H⋯N and O—H⋯O hydrogen bonds are also observed.
doi:10.1107/S1600536812000128
PMCID: PMC3274868  PMID: 22346815
8.  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.
doi:10.1107/S1600536811002741
PMCID: PMC3051994  PMID: 21522236
9.  Diaqua­bis­(5-carb­oxy-2-ethyl-1H-imidazole-5-carboxyl­ato-κ2 N 3,O 4)zinc trihydrate 
In the crystal structure of the title compound, [Zn(C7H7N2O4)2(H2O)2]·3H2O, the ZnII ion, located an inversion center, is N,O-chelated by two 5-carb­oxy-2-ethyl-1H-imidazole-4-carboxyl­ate anions and further coordinated by two water mol­ecules in a distorted octa­hedral geometry. The carb­oxy group links with the carboxyl­ate group of the same ligand via an intra­molecular O—H⋯O hydrogen bond. An extensive inter­molecular N—H⋯O and O—H⋯O hydrogen-bonded network exists in the crystal structure. One disordered lattice water mol­ecule is half-occupied and is located close to an inversion center.
doi:10.1107/S160053681101676X
PMCID: PMC3120609  PMID: 21754616
10.  (4-Carb­oxy-2-sulfonato­benzoato-κ2 O 1,O 2)bis­(1,10-phenanthroline-κ2 N,N′)manganese(II) 
In the title complex, [Mn(C8H4O7S)(C12H8N2)2], the MnII atom is chelated by one 4-carb­oxy-2-sulfonato­benzoate anion and two phenathroline (phen) ligands in a distorted octa­hedral MnN4O2 geometry. The benzene ring of the 4-carb­oxy-2-sulfonato­benzoate anion is twisted with respect to the two phen ring systems at dihedral angles of 66.38 (9) and 53.56 (9)°. In the crystal, inter­molecular O—H⋯O and C—H⋯O hydrogen bonding links the mol­ecules into chains running parallel to [100]. Inter­molecular π–π stacking is also observed between parallel phen ring systems, the face-to-face distance being 3.432 (6) Å.
doi:10.1107/S1600536810023743
PMCID: PMC3006856  PMID: 21587760
11.  (Quinoline-2-carboxyl­ato-κO)(quinoline-2-carb­oxy­lic acid-κO)bis­(quinoline-2-carb­oxy­lic acid-κ2 N,O)potassium 
The K atom in the title complex, [K(C10H6NO2)(C10H7NO2)3], lies on a twofold rotation axis that relates one N,O-chelating quinoline-2-carb­oxy­lic acid to the other; their N and O atoms are cis to each other in the distorted octa­hedral coordination geometry. The K atom is also coordinated by another monodentate quinoline-2-carb­oxy­lic acid; the acid is disordered with respect to a monodentate quinoline-2-carboxyl­ate anion; the acid and anion are linked by an O—H⋯O hydrogen bond. An O—H⋯N hydrogen bond links adjacent mol­ecules into a linear chain structure along the a axis.
doi:10.1107/S1600536810027510
PMCID: PMC3007487  PMID: 21588178
12.  Poly[diaqua­(μ4-2,5-dicarb­oxy­benzene-1,4-dicarboxyl­ato-κ4 O 1:O 2:O 4:O 5)(μ2-2,5-dicarb­oxy­benzene-1,4-dicarboxyl­ato-κ2 O 1:O 4)bis­(1,10-phenanthroline-κ2 N,N′)dimanganese(II)] 
In the title compound, [Mn2(C10H4O8)2(C12H8N2)2(H2O)2]n, the Mn2+ ion has a slightly distorted octa­hedral N2O4 coordination geometry being coordinated by one aqua O atom, two N atoms of the chelating 1,10-phenanthroline ligand and three carboxyl O atoms from three 2,5-dicarb­oxy­benzene-1,4-dicarboxyl­ate (H2btec2−) ligands. The H2btec2− anion exhibits two different coordination modes, viz. μ2 and μ4. Both of the H2btec2− anions are located on special positions (inversion centers). The μ4-anion bridges adjacent MnII atoms, forming a chain along the a axis. Adjacent chains are further bridged by μ2-anions, resulting in a two-dimensional layered polymer parallel to (011). In the crystal, extensive carb­oxy–carboxyl­ate O—H⋯O and water–carboxyl­ate O—H⋯O inter­actions lead to the formation of a three-dimensional supra­molecular network.
doi:10.1107/S1600536812035441
PMCID: PMC3435605  PMID: 22969478
13.  Aqua­[2-(3-carb­oxy-5-carboxyl­atophen­oxy)acetato-κO 1]bis­(1,10-phenanthroline-κ2 N,N′)manganese(II) dihydrate 
In the title complex, [Mn(C10H6O7)(C12H8N2)2(H2O)]·2H2O, the MnII atom is coordinated by two O atoms from one 2-(3-carb­oxy-5-carboxyl­atophen­oxy)acetate (HOABDC2−) dianion and one water mol­ecule and by four N atoms from two 1,10-phenanthroline (phen) ligands within a distorted octa­hedral geometry. O—H⋯O hydrogen bonding between –COOH and –COO− groups of adjacent mol­ecules and between carboxyl­ate groups and coordinated and uncoordin­ated water mol­ecules leads to a three-dimensional structure which is further stabilized by weak π–π inter­actions of adjacent phen ligands with centroid–centroid separations of 4.2932 (1) Å.
doi:10.1107/S1600536810048142
PMCID: PMC3011514  PMID: 21589312
14.  catena-Poly[[bis­(p-toluene­sulfonato-κO)palladium(II)]bis­(μ-1,3-di-4-pyridylpropane-κ2 N:N′)] 
In the title compound, [Pd(C7H7O3S)2(C13H14N2)2]n, the metal ion, located on a twofold rotation axis, exhibits a slightly distorted octa­hedral coordination environment, with bond angles that deviate by at most 2.2° from an ideal geometry, completed by two O atoms from two deprotonated p-toluene­sulfonic acid ligands and four N atoms from four 1,3-di-4-pyridylpropane ligands. One of the sulfonate O atoms is disordered over two positions [ratio 0.70 (5):0.30 (5)].
doi:10.1107/S1600536809032760
PMCID: PMC2969940  PMID: 21577460
15.  Bis[μ-4-(4-carb­oxy­phen­oxy)phthalato]bis­[triaqua­cobalt(II)] 
The dinuclear title complex, [Co2(C15H8O7)2(H2O)6], lies across an inversion center. The unique CoII ion is coordinated in a slightly distorted octa­hedral coordination geometry by two O atoms from a chelating 4-(carb­oxy­phen­oxy)phthalate ligand, three water O atoms and a further O atom from a bridging carboxyl­ate group of a symmetry-related 4-(carb­oxy­phen­oxy)phthalate ligand. In the crystal, O—H⋯O hydrogen bonds link the mol­ecules into a three-dimensional network.
doi:10.1107/S1600536813000536
PMCID: PMC3569198  PMID: 23424399
16.  Tetra­aqua­bis­[1-(3-carb­oxy­phen­yl)-4,4′-bipyridin-1-ium-κN 1′]zinc bis­(4,5-carb­oxy­benzene-1,2-dicarboxyl­ate) 2.5-hydrate 
In the complex cation of the title compound, [Zn(C17H13N2O2)2(H2O)4](C10H4O8)2·2.5H2O, the ZnII atom, lying on an inversion center, is coordinated by two N atoms from two N-(3-carb­oxy­phen­yl)-4,4′-bipyridin-1-ium ligands and four water mol­ecules in a distorted octa­hedral geometry. The pyromellitate anion is double deprotonated. O—H⋯O and C—H⋯O hydrogen bonds connect the cations, anions and uncoordinated water mol­ecules into a three-dimensional supra­molecular network. One of the two lattice water molecules shows an occupancy of 0.25. An intra­molecular O—H⋯O hydrogen bond is present in the anion.
doi:10.1107/S1600536811045156
PMCID: PMC3238626  PMID: 22199517
17.  Poly[[diaqua­bis­{μ-4-[6-(4-carb­oxy­phen­yl)-4,4′-bipyridin-2-yl]benzoato-κ2 O:N 1′}copper(II)] dimethyl­formamide tetra­solvate] 
In the title compound, {[Cu(C24H15N2O4)2(H2O)2]·4C3H7NO}n, the CuII ion, lying on an inversion center, is six-coordinated by two N atoms from two 4-[6-(4-carb­oxy­phen­yl)-4,4′-bipyridin-2-yl]benzoate (L) ligands, two deprotonated carboxyl­ate O atoms from two other symmetry-related L ligands and two water mol­ecules in a slightly distorted octa­hedral geometry. The CuII atoms are linked by the bridging ligands into a layer parallel to (101). The presence of intra­layer O—H⋯O hydrogen bonds and π–π inter­actions between the pyridine and benzene rings [centroid–centroid distances = 3.808 (2) and 3.927 (2) Å] stabilizes the layer. Further O—H⋯O hydrogen bonds link the layers and the dimethyl­formamide solvent mol­ecules.
doi:10.1107/S1600536813006430
PMCID: PMC3629482  PMID: 23634000
18.  catena-Poly[iron(II)-bis­{μ-5-carb­oxy-2-[(1H-1,2,4-triazol-1-yl)meth­yl]-1H-imidazole-4-carboxyl­ato}] 
In the title coordination polymer, [Fe(C8H6N5O4)2]n {or [FeL 2]n,where HL = 2-[(1H-1,2,4-triazol-1-yl) meth­yl]-1H-imidazole-4,5-dicarb­oxy­lic acid)}, the FeII ion, located on an inversion centre, is six-coordinated by two O atoms and four N atoms from two L − ligands in a distorted octa­hedral geometry [Fe—O = 2.1452 (13), Fe—N = 2.1316 (14) and 2.2484 (15) Å]. There is an intra­molecular O—H⋯O hydrogen bond in each L − ligand. Being an effective tridentate bridging ligand, the deprotonated L − anions link two FeII atoms, yielding a chain-like polymer propagating along [100]. In the crystal, these polymer chains are linked via N—H⋯N hydrogen bonds, forming a two-dimensional network.
doi:10.1107/S1600536811036026
PMCID: PMC3201379  PMID: 22058720
19.  catena-Poly[[[cis-aqua­dibromido­cobalt(II)]-μ-(pyrazine-2-carb­oxy­lic acid)-κ3 N 1,O:N 4] monohydrate] 
The title compound, {[CoBr2(C5H4N2O2)(H2O)]·H2O}n, is a one-dimensional coordination polymer which crystallizes as a monohydrate. The asymmetric unit contains one CoII atom in a distorted octa­hedral geometry, forming a chain parallel to [010] with the pyrazine carb­oxy­lic acid ligands coordinating on one side in a bidentate fashion through one N and one O atom, and in a monodentate fashion through a N atom, with N atoms trans, and with both ligands lying in the same plane. The bromide atoms are cis to each other, while a water mol­ecule occupies the final octa­hedral coordination site. The chains are linked together though an O—H⋯Br hydrogen bonding network, and are further stabilized by an O—H⋯Br and O—H⋯O hydrogen-bonding framework with the solvent water mol­ecule.
doi:10.1107/S1600536811048628
PMCID: PMC3238706  PMID: 22199583
20.  2,9-Dimethyl-1,10-phenanthrolin-1-ium (6-carb­oxy-4-hy­droxy­pyridine-2-carboxyl­ato-κ3 O 2,N,O 6)(4-hy­droxy­pyridine-2,6-dicarboxyl­ato-κ3 O 2,N,O 6)zincate(II) 2.35-hydrate: a proton-transfer compound 
In the title compound, (C14H13N2)[Zn(C7H3NO5)(C7H4NO5)]·2.35H2O, the ZnII atom is coordinated by two N atoms and four O atoms from the carboxyl­ate groups of the 4-hy­droxy­pyridine-2,6-dicarboxyl­ate and 6-carb­oxy-4-hy­droxy­pyridine-2-carboxyl­ate ligands, forming a distored octa­hedral geometry. In the anion, the two pyridine rings are inclined to one another by 87.75 (13)°. Two types of robust O—H⋯O hydrogen bond synthons, viz. R 2 2(16) and R 6 6(42), link the anions to form a two-dimensional network parallel to the bc plane. Furthermore, O—H⋯O, N—H⋯O, N—H⋯N and weak C—H⋯O hydrogen bonds connect the two dimensional networks, forming a three-dimensional structure. In the crystal, there are also C—H⋯π and π–π inter­actions [centroid–centroid distances of 3.5554 (18) and 3.7681 (18) Å], and C=O⋯π inter­actions [O⋯centroid distance = 3.117 (2) Å] present. One of the three crystal water molecules shows an occupancy of 0.35.
doi:10.1107/S1600536811052445
PMCID: PMC3254305  PMID: 22259335
21.  Diaqua­bis­(5-carb­oxy-2-propyl-1H-imidazole-4-carboxyl­ato-κ2 N 3,O 4)zinc(II) 3.5-hydrate 
In the title complex, [Zn(C8H9N2O4)2(H2O)2]·3.5H2O, the ZnII ion is coordinated by two N,O-bidentate H2pimda ligands (H3pimda = 2-propyl-1H-imidazole-4,5-dicarb­oxy­lic acid) and two water mol­ecules in a distorted octa­hedral environment. In the crystal structure, extensive inter­molecular O—H⋯O and N—H⋯O hydrogen bonds stabilize the three-dimensional supra­molecular network. Intra­molecular O—H⋯O hydrogen bonds between the carboxyl groups are also observed. The propyl groups of the two H2pimda 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 mol­ecules is half-occupied.
doi:10.1107/S1600536810031478
PMCID: PMC3008058  PMID: 21588509
22.  trans-Diaqua­bis­[5-carb­oxy-4-carboxyl­ato-2-(4-pyridinio)-1H-imidazol-1-ido-κ2 N 3,O 4]zinc(II) 
In the title complex, [Zn(C10H6N3O4)2(H2O)2], the ZnII atom is located on a twofold rotation axis and is coordinated by two trans-positioned N,O-bidentate and zwitterionic 5-carb­oxy-4-carboxyl­ato-2-(4-pyridinio)-1H-imidazol-1-ide (H2PIDC−) ligands and two water mol­ecules, defining a distorted octa­hedral environment. The complete solid-state structure can be described as a three-dimensional supra­molecular framework, stabilized by extensive hydrogen-bonding inter­actions involving the coordinated water mol­ecules, uncoordin­ated imidazole N atom, protonated pyridine N and carboxyl­ate O atoms of the H2PIDC− ligands.
doi:10.1107/S1600536810031855
PMCID: PMC3007913  PMID: 21588565
23.  Crystal structure of poly[[{μ2-1,4-bis[(1H-imid­azol-1-yl)methyl]benzene}[μ6-5-(4-carboxylatophenoxy)isophthalato]-μ3-hydroxido-dicobalt(II)] 0.25-hydrate] 
The title coordination polymer, {[Co2(C15H7O7)(OH)(C14H14N4)]·0.25H2O}n, was synthesized under hydro­thermal conditions. The asymmetric unit contains two Co2+ ions, one L 3− anion originating from 5-(4-carb­oxy­phen­oxy)isophthalic acid (H3 L), one OH− ligand, one 1,4-bis­[(1H-imidazol-l-yl)meth­yl]benzene (bix) ligand and one disordered lattice water mol­ecule (occupancy 0.25). The two Co2+ ions have different environments. One has an octa­hedral O4N2 coordin­ation sphere, defined by four O atoms from three carboxyl­ate groups and one OH− ligand, and two N atoms from two symmetry-related bix ligands. The other has a trigonal-bipyramidal O5 coordination sphere resulting from three carboxyl­ate groups and two OH− ligands. The dihedral angles between the two benzene rings in the L 3− ligand and between the benzene ring and the two imidazole rings in the bix ligand are 67.05 (15), 75.27 (17) and 82.05 (17)°, respectively. Four neighbouring Co2+ ions are linked by six carboxyl­ate groups and two μ 3-OH ligands, forming a butterfly-shaped secondary building unit (SBU). These SBUs are connected by L 3− anions into layers parallel to (1-10). Adjacent layers are cross-linked by the bix ligands, forming a three-dimensional framework that has a bimodal (3,8)-connected tfz-d topology. The disordered lattice water mol­ecule is located in the voids of the framework and has O⋯O and O⋯N contacts of 2.81 (2) and 2.95 (2) Å, suggesting medium-strength hydrogen bonds. The title compound may be a good candidate for artificial eye lenses.
doi:10.1107/S1600536814022806
PMCID: PMC4257313  PMID: 25484783
crystal structure; CoII complex; (3,8)-connected tfz-d topology
24.  Bis(2-carboxybenzo­ato-κO 1)bis­[1-cyclo­propyl-6-fluoro-4-oxo-7-(piperazin-4-ium-1-yl)-1,4-dihydro­quinoline-3-carboxyl­ato-κ2 O 3,O 4]manganese(II) dihydrate 
The title compound, [Mn(C17H18FN3O3)2(C8H5O4)2]·2H2O or [Mn(cfH)2(1,2-Hbdc)2]·2H2O (cfH = ciprofloxacin = 1-cyclo­propyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazin­yl)-3-quinoline carb­oxy­lic acid, 1,2-bdc = benzene-1,2-dicarboxyl­ate), has been prepared under hydro­thermal conditions. The Mn2+ atom, located on an inversion centre, exhibits a distorted octa­hedral geometry, coordinated by four O atoms from two symmetry-related zwitterionic ciprofloxacin ligands in the equatorial positions and two O atoms of two 1,2-Hbdc ligands in the axial positions. The complex mol­ecules are linked into a two-dimensional network through N—H⋯O and OW—H⋯O hydrogen bonds. A strong intramolecular hydrogen bond between the carboxyl/carboxylate groups of the 1,2-Hbdc anion is also present. The layers are further extended through off-set aromatic π–π stacking inter­actions of cfH groups [centroid–centroid distance of 3.657 (2) Å] into the final three-dimensional supra­molecular arrays.
doi:10.1107/S1600536811011615
PMCID: PMC3089319  PMID: 21754278
25.  Diaqua­bis­(2-oxo-2H-chromene-3-carboxyl­ato)copper(II) 
In the title compound, [Cu(C10H5O4)2(H2O)2], the CuII atom lies on a crystallographic inversion center and exhibits an octa­hedral coordination defined by two O atoms from water mol­ecules in the axial positions and by four O atoms from two deprotonated coumarin-3-carb­oxy­lic acid ligands in the equatorial positions. The angles around the CuII atom vary between 85.32 (6) and 94.68 (6)°. The Cu—O bond distances between the CuII atom and the O atoms vary between 1.9424 (14) and 2.3229 (15) Å. The layers inter­digitate via face-to-face aromatic inter­actions [3.6490 (8) Å] between coumarin moieties such that the inter­layer separation is 10.460 (2) Å, i.e. the length of the c axis. O—H⋯O hydrogen bonds between the H atoms of coordinated water mol­ecules and the O atoms of carboxyl­ate groups link the complex mol­ecules into layers parallel to the ab plane.
doi:10.1107/S1600536811018708
PMCID: PMC3120618  PMID: 21754664

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