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In the title complex, [Co(C7H4ClO2)2(C6H6N2O)2(H2O)2], the CoII atom is located on an inversion center and is coordinated by two 3-chloro­benzoate (CB) anions, two nicotinamide (NA) ligands and two water mol­ecules. The four O atoms in the equatorial plane form a slightly distorted square-planar arrangement, while the slightly distorted octa­hedral coordination is completed by the two N atoms of the NA ligands in the axial positions. The dihedral angle between the carboxyl­ate group and the adjacent benzene ring is 9.14 (9)°, while the pyridine and benzene rings are oriented at a dihedral angle of 82.18 (8)°. In the crystal, N—H...O and O—H...O hydrogen bonds link the mol­ecules into a two-dimensional network lying parallel to (101). π–π stacking between parallel pyridine rings of adjacent mol­ecules [centroid–centroid distance = 3.7765 (8) Å] further stabilizes the crystal structure.

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The mol­ecule of the title CuII complex, [Cu(C7H4ClO2)2(C6H6N2O)2], contains two 3-chloro­benzoate (CB) and two nicotinamide (NA) ligands; the CB act as bidentate ligands, while the NA are monodentate ligands. The resulting CuN2O4 coordination polyhedron is a considerably distorted octahedron. The dihedral angles between the carboxyl­ate groups and the adjacent benzene rings are 17.92 (12) and 24.69 (16)°, while the two benzene rings and the two pyridine rings are oriented at dihedral angles of 52.20 (8) and 1.56 (6)°. In the crystal, N—H...N and C—H...O hydrogen bonds link the mol­ecules into a three–dimensional network. The π–π contact between the benzene rings [centroid–centroid distance = 3.982 (2) Å] may further stabilize the crystal structure.

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In the polymeric title compound, [Zn(C7H4ClO2)2(H2O)]n, the ZnII cation is located on a twofold rotation axis and is coordinated by carboxylate O atoms of four monodentate chloro­benzoate anions and by one water mol­ecule, located on a twofold rotation axis, in a distorted square-pyramidal geometry. In the anion, the carboxyl­ate group is twisted away from the attached benzene ring by 44.16 (11)°. The chloro­benzoate anion bridges ZnII cations, forming polymeric chains running along the c-axis direction. O—H...O hydrogen bonds between coordinating water mol­ecules and carboxyl­ate groups link adjacent chains into layers parallel to the bc plane.

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In the centrosymmetric dinuclear title compound, [Cd2(C7H4ClO2)4(C6H6N2O)2(H2O)2], the CdII atom is coord­inated by one N atom from one bridging nicotinamide ligand and one O atom from another symmetry-related bridging nicotinamide ligand, four O atoms from two 3-chloro­benzoate ligands and one water mol­ecule in an irregular geometry. The dihedral angles between the carboxyl­ate groups and the adjacent benzene rings are 6.98 (12) and 2.42 (13)°, while the benzene rings are oriented at a dihedral angle of 4.33 (6)°. Inter­molecular O—H...O, N—H...O and weak C—H...O hydrogen bonds link the mol­ecules into a three-dimensional network. π–π inter­actions, indicated by short centroid–centroid distances [3.892 (1) Å between the pyridine rings and 3.683 (1) Å between the benzene rings] further stabilize the structure.
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