Diaqua­bis(4-bromo­benzoato-κ2 O,O′)zinc(II)

The monomeric title ZnII complex, [Zn(C7H4BrO2)2(H2O)2], contains two 4-bromo­benzoate (BB) ligands and two coordinated water mol­ecules around a ZnII atom on a twofold rotation axis. The BB ions act as bidentate ligands, with two very dissimilar coordination distances. The sixfold coordination around the ZnII may be described as highly distorted octa­hedral, with the two aqua ligands arranged cis. Hydrogen bonding involving the carboxyl­ate O atoms has an effect on the delocalization in the carboxyl­ate groups. In the crystal structure, inter­molecular O—H⋯O hydrogen bonds link the mol­ecules into chains parallel to the c axis and stacked along the b axis

Tetra­aqua­bis(isonicotinamide-κN 1)nickel(II) bis­(4-formyl­benzoate) dihydrate

The asymmetric unit of the title complex, [Ni(C6H6N2O)2(H2O)4](C8H5O3)2·2H2O, contains one-half of the complex cation with the NiII atom located on an inversion center, a 4-formyl­benzoate (FB) counter-anion and an uncoordinated water mol­ecule. The four O atoms in the equatorial plane around the Ni atom form a slightly distorted square-planar arrangement and the slightly distorted octa­hedral coordination is completed by the two N atoms of the isonicotinamide (INA) ligands at a sligthly longer distance in the axial positions. The dihedral angle between the carboxyl­ate group and the attached benzene ring is 8.14 (11)°, while the pyridine and benzene rings are oriented at a dihedral angle of 3.46 (6)°. In the crystal structure, O—H⋯O, N—H⋯O and C—H⋯O hydrogen bonds link the mol­ecules into a three-dimensional network. π–π Contacts between the benzene and pyridine rings [centroid–centroid distance = 3.751 (1) Å] may further stabilize the crystal structure

Bis(isonicotinamide-κN 1)bis­(4-methyl­benzoato-κO)copper(II) dihydrate

In the centrosymmetric title compound, [Cu(C8H7O2)2(C6H6N2O)2]·2H2O, the CuII ion is located on a crystallographic inversion center. The asymmetric unit is completed by one 4-methyl­benzoate anion, one isonicotinamide (INA) ligand and one uncoordinated water mol­ecule; all the ligands are monodentate. The two O and the two N atoms around the CuII ion form a slightly distorted square-planar arrangement. The dihedral angle between the carboxyl­ate group and the attached benzene ring is 13.86 (9)°, while the pyridine and benzene rings are oriented at a dihedral angle of 86.08 (5)°. The uncoordinated water mol­ecules are linked to the INA ligands by O—H⋯O hydrogen bonds. In the crystal structure, inter­molecular O—H⋯O, N—H⋯O and C—H⋯O hydrogen bonds link the mol­ecules into a three-dimensional network

Di-μ-nicotinamide-κ2 O:N 1;κ2 N 1:O-bis­[aqua­bis­(4-meth­oxy­benzoato-κO)copper(II)]

The asymmetric unit of the centrosymmetric dinuclear title compound, [Cu2(C8H7O3)4(C6H6N2O)2(H2O)2], contains one half of the complex mol­ecule. Each CuII atom is five-coordinated by one N atom from one bridging nicotinamide ligand and one O atom from another symmetry-related bridging nicotinamide ligand, two O atoms from two 4-meth­oxy­benzoate ligands, and one water mol­ecule, forming a distorted square-pyramidal geometry. Inter­molecular O—H⋯O and N—H⋯O hydrogen bonds link the mol­ecules into layers parallel to (01). π–π inter­actions, indicated by short inter­molecular distances of 3.801 (1) Å between the centroids of the benzene rings and 3.653 (1) Å between the centroids of the pyridine rings, further stabilize the structure

Tetra­kis[μ-4-(methyl­amino)­benzoato-κ2 O:O′]bis­[(N,N-diethyl­nicotinamide-N 1)zinc(II)] dihydrate

The title mol­ecule, [Zn2(C8H8NO2)4(C10H14N2O)2]·2H2O, is a centrosymmetric binuclear complex, with two ZnII ions [Zn⋯Zn’ = 2.9301 (4) Å] bridged by four methyl­amino­benzoate (MAB) ligands. The four nearest O atoms around each ZnII ion form a distorted square-planar arrangement with the distorted square-pyramidal coordination completed by the pyridine N atom of the N,N-diethyl­nicotinamide (DENA) ligand. Each ZnII ion is displaced by 0.3519 (2) Å from the plane of the four O atoms, with an average Zn—O distance of 2.030 Å. The dihedral angles between carboxyl­ate groups and adjacent benzene rings are 10.57 (10) and 16.63 (12)°, while the benzene rings are oriented at a dihedral angle of 81.84 (5)°. The pyridine ring is oriented at dihedral angles of 40.49 (6) and 51.25 (6)° with respect to the benzene rings. In the crystal structure, inter­molecular O—H⋯O and N—H⋯O hydrogen bonds link the mol­ecules into a three-dimensional network. The π–π contact between the inversion-related pyridine rings [centroid–centroid distance = 3.633 (1) Å] may further stabilize the crystal structure

catena-Poly[[[bis­(4-ethyl­benzoato-κ2 O,O′)lead(II)]-μ-nicotinamide-κ2 N 1:O] monohydrate]

In the crystal structure of the polymeric title compound, {[Pb(C9H9O2)2(C6H6N2O)]·H2O}n, the six-coordinate PbII ion is chelated by two 4-ethyl­benzoate (PEB) anions and is bridged by two nicotinamide (NA) ligands, forming a polymeric chain running along the b axis. The carboxyl­ate groups of the PEB ions are twisted away from the attached benzene rings by 4.0 (6) and 13.3 (5)°. The two benzene rings of the PEB ions bonded to the same metal ion are oriented at a dihedral angle of 87.4 (3)°. In the polymeric chain, the NA ligand is linked to one of the carboxyl­ate groups via N—H⋯O hydrogen bonding. In the crystal, adjacent polymeric chains inter­act via N—H⋯O and weak C—H⋯O hydrogen bonds; and the lattice water mol­ecule links with the polymeric chains via N—H⋯O and O—H⋯O hydrogen bonding. π–π stacking between the benzene and the pyridine rings [centroid–centroid distance = 3.805 (5) Å] and weak C—H⋯π inter­actions are also observed in the crystal structure

trans-Tetra­aqua­bis­(isonicotinamide-κN 1)cobalt(II) bis­(3-hy­droxy­benzoate) tetra­hydrate

The asymmetric unit of the title compound, [Co(C6H6N2O)2(H2O)4](C7H5O3)2·4H2O, contains one-half of the complex cation with the CoII ion located on an inversion center, a 3-hy­droxy­benzoate counter-anion and two uncoordinated water mol­ecules. Four water O atoms in the equatorial plane around the CoII ion [Co—O = 2.0593 (16) and 2.1118 (16) Å] form a slightly distorted square-planar arrangement, and the distorted octahedral geometry is completed by the two N atoms [Co—N = 2.1306 (18) Å] from two isonicotinamide ligands. In the anion, the carboxyl­ate group is twisted from the attached benzene ring at 8.84 (17)°. In the crystal, a three-dimensional hydrogen-bonding network, formed by classical O—H⋯O and N—H⋯O hydrogen bonds, consolidates the crystal packing, which exhibits π–π inter­actions between the benzene and pyridine rings, with centroid–centroid distances of 3.458 (1) and 3.606 (1) Å, respectively

Tetra­aqua­bis(nicotinamide-κN 1)nickel(II) bis­(2-fluoro­benzoate)

The asymmetric unit of the title complex, [Ni(C6H6N2O)2(H2O)4](C7H4FO2)2, contains one-half of the complex cation with the NiII atom located on an inversion center, and a 2-fluoro­benzoate (FB) counter-anion. The four O atoms in the equatorial plane around the Ni atom form a slightly distorted square-planar arrangement with an average Ni—O bond length of 2.079 Å, and the slightly distorted octa­hedral coordination is completed by the two N atoms of the nicotinamide (NA) ligands in the axial positions. The dihedral angle between the carboxyl group and the attached benzene ring is 28.28 (11)°, while the pyridine and benzene rings are oriented at a dihedral angle of 8.31 (4)°. In the crystal structure, O—H⋯O, N—H⋯O, C—H⋯O, and C—H⋯F hydrogen bonds link the mol­ecules into a three-dimensional network. π–π Contacts between the pyridine and benzene rings [centroid–centroid distance = 3.626 (1) Å] may further stabilize the crystal structure. The 2-fluoro­benzoate anion is disordered over two orientations, with an occupancy ratio of 0.85:0.15

Aqua­bis­(4-fluoro­benzoato-κO)bis­(nicotinamide-κN 1)copper(II) nicotinamide hemisolvate trihydrate

The asymmetric unit of the title compound, [Cu(C7H4FO2)2(C6H6N2O)2(H2O)]·0.5C6H6N2O·3H2O, contains two aqua­bis­(4-fluoro­benzoato)bis­(nicotinamide)­copper(II) mol­ecules, one nicotinamide solvent mol­ecule and six water mol­ecules. The CuII ion is coordinated by two O atoms from two 4-fluoro­benzoate ligands, two N atoms from two nicotinamide ligands and one water O atom in a distorted square-pyramidal geometry. In the crystal, O—H⋯O, O—H⋯N and N—H⋯O hydrogen bonds consolidate the crystal packing, which also exhibits π–π inter­actions between the aromatic rings [centroid–centroid distances 3.692 (2)–3.794 (2) Å]

catena-Poly[[aqua­(2-iodo­benzoato-κO)cobalt(II)]-μ-aqua-μ-2-iodo­benzoato-κ2 O:O′]

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