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In the centrosymmetric binuclear title complex, [Cu2(C7H4IO2)4(H2O)2], the two CuII ions [Cu...Cu = 2.6009 (5) Å] are bridged by four 2-iodo­benzoate (IB) ligands. The four nearest O atoms around each CuII ion form a distorted square-planar arrangement, the distorted square-pyramidal coordination being completed by the O atom of the water mol­ecule at a distance of 2.1525 (16) Å. The dihedral angle between the benzene ring and the carboxyl­ate group is 25.67 (13)° in one of the independent IB ligands and 6.44 (11)° in the other. The benzene rings of the two independent IB ligands are oriented at a dihedral angle of 86.61 (7)°. In the crystal, O—H...O inter­actions link the mol­ecules into a two-dimensional network. π–π contacts between the benzene rings [centroid–centroid distances = 3.810 (2) and 3.838 (2) Å] may further stabilize the structure.

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In the title complex, [Co(C7H4IO2)2(C6H6N2O)2(H2O)2], the CoII cation is located on an inversion center and is coordinated by two monodentate 2-iodo­benzoate (IB) anions, two nicotin­amide (NA) ligands and two water mol­ecules. The four O atoms in the equatorial plane around the CoII cation 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 22.3 (3)°, while the pyridine ring and the benzene ring are oriented at a dihedral angle of 84.59 (13)°. Intra­molecular O—H...O hydrogen bonding occurs between the carboxyl­ate group and coordinated water mol­ecule. In the crystal, N—H...O, O—H...O and weak C—H...O hydrogen bonds link the mol­ecules into a three-dimensional supra­molecular network.

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The asymmetric unit of the polymeric title compound, [Co(C7H4IO2)2(H2O)2]n, contains one CoII cation, two iodo­benzoate anions and two water mol­ecules. One iodo­benzoate anion and one water mol­ecule bridge adjacent Co cations, forming a polymeric chain running along the a axis, while the other iodo­benzoate anion and water mol­ecule coordinate in a monodentate manner to the CoII cation, completing the slightly distorted octa­hedral geometry. In the two independent anionic ligands, the carboxyl­ate groups are twisted away from the attached benzene rings by 51.38 (18) and 39.89 (11)°, and the two benzene rings are nearly perpendicular to each other with a dihedral angle of 86.09 (10)°. Intra­molecular O—H...O hydrogen bonds between coordinating water mol­ecules and adjacent carboxyl­ate O atoms help to stabilize the mol­ecular structure. In the crystal, weak C—H...O hydrogen bonds link the polymeric chains into a three-dimentional supra­molecular network.

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In the title complex, [Cu(C7H4IO2)2(C6H6N2O)2(H2O)2], the CuII cation is located on an inversion center and is coordinated by two monodentate 2-iodo­benzoate (IB) anions, two nicotinamide (NA) ligands and two water mol­ecules in a distorted octa­hedral coordination geometry. The dihedral angle between the carboxyl­ate group and the adjacent benzene ring is 32.12 (14)°, while the pyridine ring and the benzene ring are oriented at a dihedral angle of 82.02 (5)°. The coordinating water mol­ecule links with the carboxyl­ate group via an intra­molecular O—H...O hydrogen bond. In the crystal, N—H...O, O—H...O and weak C—H...O hydrogen bonds link the mol­ecules into a three-dimensional supra­molecular network.
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