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

4-(Methyl­amino)benzoic acid

The asymmetric unit of the title compound, C8H9NO2, contains three crystallographically independent mol­ecules, which are essentially planar, the carboxyl O atoms deviating by 0.091 (3), 0.101 (2) and 0.164 (3) Å from the mean plane through the non-H atoms. In the crystal, all three mol­ecules form O—H⋯O hydrogen-bonded about inversion centers, forming eight-membered rings with graph-set notation R 2 2(8). In addition, N—H⋯O hydrogen bonding and C—H⋯π inter­actions reinforce the packing

Bis[4-(methyl­amino)benzoato-κO]bis­(nicotinamide-κN)zinc(II)

The title zinc complex, [Zn(C8H8NO2)2(C6H6N2O)2], is composed of two monodentate 4-(methyl­amino)benzoate and two monodentate nicotinamide ligands. The coordination around the Zn atom is distorted tetra­hedral. The dihedral angles between the two benzene rings and the two pyridine rings are 78.30 (6) and 68.86 (5)°. In the crystal structure, inter­molecular N—H⋯O hydrogen bonds link the mol­ecules into an infinite three-dimensional network

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

In the centrosymmetric binuclear title complex, [Zn2(C11H14NO2)4(C10H14N2O)2], the two ZnII ions [Zn⋯Zn = 2.8874 (3) Å] are bridged by four 4-(diethyl­amino)benzoate (DEAB) ligands. The four nearest O atoms around each ZnII ion form a distorted square-planar arrangement, the distorted square-pyramidal coordination being completed by the pyridine N atom of an N,N-diethyl­nicotinamide (DENA) ligand at a distance of 2.0484 (12) Å. The dihedral angle between the benzene ring and the carboxyl­ate group is 4.89 (6)° in one of the independent DEAB ligands and 7.13 (7)° in the other. The benzene rings of the two independent DEAB ligands are oriented at a dihedral angle of 86.58 (5)°. The pyridine ring is oriented at dihedral angles of 31.17 (4) and 58.38 (4)° with respect to the two benzene rings. In the crystal, weak inter­molecular C—H⋯O inter­actions link the mol­ecules into a three-dimensional network. Two weak C—H⋯π inter­actions are also present. The two ethyl groups of one of the DEAB ligands are disordered over two orientations, with occupancy ratios of 0.798 (5):0.202 (5) and 0.890 (5):0.110 (5)

Diaqua­bis(4-methyl­amino­benzoato-κO)bis­(nicotinamide-κN 1)cobalt(II)

The asymmetric unit of the title CoII complex, [Co(C8H8NO2)2(C6H6N2O)2(H2O)2], contains two half complex mol­ecules with similar structures. The CoII atoms are each located on an inversion center and each is coordinated by two 4-methyl­amino­benzoate (PMAB), two nicotinamide (NA) ligands and two water mol­ecules in a distorted octa­hedral coordination. The dihedral angles between the carboxyl­ate groups and the adjacent benzene rings are 3.0 (3) and 2.54 (19)°, while the pyridine and benzene rings are oriented at dihedral angles of 67.40 (8) and 66.25 (8)°. In the crystal structure, inter­molecular O—H⋯O and N—H⋯O hydrogen bonds link the mol­ecules into a supra­molecular structure

Tetra­aqua­bis[4-(methyl­amino)benzoato-κO]nickel(II)

The title complex, [Ni(C8H8NO2)2(H2O)4], is centrosymmetric with the NiII ion located on a centre of symmetry. It contains two 4-(methyl­amino)benzoate (PMAB) anions and four coordinated water mol­ecules. The four O atoms in the equatorial plane around the NiII ion form a slightly distorted square-planar arrangement, while the slightly distorted octa­hedral coordination is completed by two O atoms of the PMAB anions in the axial positions. In the crystal structure, inter­molecular O—H⋯O, O—H⋯N, N—H⋯O and C—H⋯O hydrogen bonds link the mol­ecules into a three-dimensional network

Bis[μ-4-(methyl­amino)­benzoato]-κ3 O,O′:O;κ3 O:O,O′-bis­{aqua­[4-(methyl­amino)­benzoato-κ2 O,O′](nicotinamide-κN)cadmium(II)}

In the dinuclear centrosymmetric CdII compound, [Cd2(C8H8NO2)4(C6H6N2O)2(H2O)2], the metal atom is chelated by two carboxyl­ate groups from 4-(methyl­amino)­benzoate (PMAB) anions, and coordinated by one nicotinamide and one water mol­ecule; a carboxyl­ate O atom from the adjacent PMAB anion bridges to the Cd atom, completing the irregular seven-coordination geometry. In the crystal, inter­molecular 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 pyridine rings [centroid–centroid distance = 3.965 (1) Å] may further stabilize the structure. A weak C—H⋯π inter­action also occurs

Diaqua­bis(4-methyl­amino­benzoato-κO)bis­(nicotinamide-κN 1)nickel(II)

The title NiII complex, [Ni(C8H8NO2)2(C6H6N2O)2(H2O)2], is centrosymmetric with the Ni atom on an inversion center. The mol­ecule contains two 4-methyl­amino­benzoate (MAB) and two nicotinamide (NA) ligands and two coordinated water mol­ecules, all ligands being monodentate. The four O atoms in the equatorial plane around the Ni atom 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 2.09 (14)°, while the pyridine and benzene rings are oriented at a dihedral angle of 66.15 (4)°. In the crystal structure, inter­molecular O—H⋯O and N—H⋯O hydrogen bonds link the mol­ecules into a three-dimensional network

Tetra­kis[μ-4-(diethyl­amino)­benzoato-κ2 O:O′]bis­[(N,N-diethyl­nicotinamide-κN 1)cobalt(II)]

In the centrosymmetric binuclear title complex, [Co2(C11H14NO2)4(C10H14N2O)2], the two CoII cations [Co⋯Co = 2.6199 (5) Å] are bridged by four 4-(diethyl­amino)­benzoate (DEAB) anions. The four nearest O atoms around each CoII ion form a distorted square-planar arrangement, the distorted square-pyramidal coordination geometry being completed by the pyridine N atom of an N,N-diethyl­nicotinamide (DENA) ligand. The dihedral angle between the benzene ring and the carboxyl­ate group is 7.06 (11)° in one of the independent DEAB ligands and 4.42 (9)° in the other. The benzene rings of the two independent DEAB ligands are oriented at a dihedral angle of 86.35 (8)°. The pyridine ring is oriented at dihedral angles of 31.43 (6) and 57.92 (7)° with respect to the two benzene rings. In the crystal, weak inter­molecular C—H⋯O inter­actions link the mol­ecules into a three-dimensional network. Weak C—H⋯π inter­actions are also present in the crystal structure

Bis[μ-4-(dimethyl­amino)­benzoato]-κ3 O,O′:O;κ3 O:O,O′-bis­{aqua­[4-(dimethyl­amino)­benzoato-κ2 O,O′](nicotinamide-κN 1)cadmium(II)}

In the centrosymmetric dimeric CdII title compound, [Cd2(C9H10NO2)4(C6H6N2O)2(H2O)2], each seven-coordin­ated CdII atom is chelated by the carboxyl­ate groups of the two 4-(dimethyl­amino)­benzoate (DMAB) anions; the two monomeric units are bridged through the two O atoms of the two carboxyl groups. 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. π–π contacts between the pyridine rings [centroid–centroid distance = 3.974 (1) Å] may further stabilize the structure. Weak C—H⋯π inter­actions are also observed