Diaqua-bis-[4-(dimethyl-amino)-benzoato-κO]bis-(nicotinamide-κN)zinc(II) dihydrate.

In the centrosymmetric title structure, [Zn(C(9)H(10)NO(2))(2)(C(6)H(6)N(2)O)(2)(H(2)O)(2)]·2H(2)O, the Zn(II) cation, located on an inversion center, is coordinated by two 4-(methyl-amino)-benzoate anions, two nicotinamide ligands and two water mol-ecules in a slightly distorted octa-hedral geometry. The dihedral angle between the carboxyl-ate group and the attached benzene ring is 3.09 (9)°, while the pyridine and benzene rings are oriented at a dihedral angle of 77.

Bis[μ-4-(methyl-amino)-benzoato]-κO,O':O;κO:O,O'-bis-{aqua-[4-(methyl-amino)-benzoato-κO,O'](nicotinamide-κN)cadmium(II)}.

In the dinuclear centrosymmetric Cd(II) compound, [Cd(2)(C(8)H(8)NO(2))(4)(C(6)H(6)N(2)O)(2)(H(2)O)(2)], the metal atom is chelated by two carboxyl-ate groups from 4-(methyl-amino)-benzoate (PMAB) anions, and coordinated by one nicotinamide and one water mol-ecule; a carboxyl-ate O atom from the adjacent PMAB anion bridges to the Cd atom, completing the irregular seven-coordination geometry. In the crystal, inter-molecular O-H⋯O, N-H⋯O and C-H⋯O hydrogen bonds link the mol-ecules into a three-dimensional network. π-π contacts between the pyridine rings [centroid-centroid distance = 3.

Bis[μ-4-(dimethyl-amino)-benzoato]-κO,O':O;κO:O,O'-bis-{aqua-[4-(dimethyl-amino)-benzoato-κO,O'](nicotinamide-κN)cadmium(II)}.

In the centrosymmetric dimeric Cd(II) title compound, [Cd(2)(C(9)H(10)NO(2))(4)(C(6)H(6)N(2)O)(2)(H(2)O)(2)], each seven-coordin-ated Cd(II) atom is chelated by the carboxyl-ate groups of the two 4-(dimethyl-amino)-benzoate (DMAB) anions; the two monomeric units are bridged through the two O atoms of the two carboxyl groups. In the crystal structure, inter-molecular O-H⋯O, N-H⋯O and C-H⋯O hydrogen bonds link the mol-ecules into a three-dimensional network. π-π contacts between the pyridine rings [centroid-centroid distance = 3.

Diaqua-bis(4-methyl-amino-benzoato-κO)bis-(nicotinamide-κN)cobalt(II).

The asymmetric unit of the title Co(II) complex, [Co(C(8)H(8)NO(2))(2)(C(6)H(6)N(2)O)(2)(H(2)O)(2)], contains two half complex mol-ecules with similar structures. The Co(II) atoms are each located on an inversion center and each is coordinated by two 4-methyl-amino-benzoate (PMAB), two nicotinamide (NA) ligands and two water mol-ecules in a distorted octa-hedral coordination. The dihedral angles between the carboxyl-ate groups and the adjacent benzene rings are 3.

Tetra-aqua-bis[4-(methyl-amino)benzoato-κO]nickel(II).

The title complex, [Ni(C(8)H(8)NO(2))(2)(H(2)O)(4)], is centrosymmetric with the Ni(II) ion located on a centre of symmetry. It contains two 4-(methyl-amino)benzoate (PMAB) anions and four coordinated water mol-ecules. The four O atoms in the equatorial plane around the Ni(II) ion form a slightly distorted square-planar arrangement, while the slightly distorted octa-hedral coordination is completed by two O atoms of the PMAB anions in the axial positions.

Tetra-kis[μ-4-(diethyl-amino)-benzoato-κO:O']bis-[(N,N-diethyl-nicotinamide-κN)cobalt(II)].

In the centrosymmetric binuclear title complex, [Co(2)(C(11)H(14)NO(2))(4)(C(10)H(14)N(2)O)(2)], the two Co(II) cations [Co⋯Co = 2.6199 (5) Å] are bridged by four 4-(diethyl-amino)-benzoate (DEAB) anions. The four nearest O atoms around each Co(II) ion form a distorted square-planar arrangement, the distorted square-pyramidal coordination geometry being completed by the pyridine N atom of an N,N-diethyl-nicotinamide (DENA) ligand.

Diaqua-bis(4-methyl-amino-benzoato-κO)bis-(nicotinamide-κN)nickel(II).

The title Ni(II) complex, [Ni(C(8)H(8)NO(2))(2)(C(6)H(6)N(2)O)(2)(H(2)O)(2)], is centrosymmetric with the Ni atom on an inversion center. The mol-ecule contains two 4-methyl-amino-benzoate (MAB) and two nicotinamide (NA) ligands and two coordinated water mol-ecules, 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 octa-hedral coordination is completed by the two N atoms of the NA ligands in the axial positions.

Tetra-kis[μ-4-(diethyl-amino)benzoato-κO:O']bis-[(N,N-diethyl-nicotinamide-κN)zinc(II)].

In the centrosymmetric binuclear title complex, [Zn(2)(C(11)H(14)NO(2))(4)(C(10)H(14)N(2)O)(2)], the two Zn(II) ions [Zn⋯Zn = 2.8874 (3) Å] are bridged by four 4-(diethyl-amino)benzoate (DEAB) ligands. The four nearest O atoms around each Zn(II) ion form a distorted square-planar arrangement, the distorted square-pyramidal coordination being completed by the pyridine N atom of an N,N-diethyl-nicotinamide (DENA) ligand at a distance of 2.

Diaqua-bis(N,N-diethyl-nicotinamide-κN)bis-[4-(dimethyl-amino)benzoato-κO]nickel(II).

The centrosymmetric title Ni(II) complex, [Ni(C(9)H(10)NO(2))(2)(C(10)H(14)N(2)O)(2)(H(2)O)(2)], contains two dimethyl-amino-benzoate (DMAB), two diethyl-nicotinamide (DENA) ligands and two water mol-ecules, all of them monodentate. The four O atoms in the equatorial plane around the Ni(II) atom form a slightly distorted square-planar arrangement, while the slightly distorted octa-hedral coordination is completed by the two pyridine N atoms of the DENA ligands in axial positions. The Ni(II) atom is displaced by 0.

Diaqua-bis[4-(dimethyl-amino)benzoato](isonicotinamide)zinc(II).

The mol-ecule of the title Zn(II) complex, [Zn(C(9)H(10)NO(2))(2)(C(6)H(6)N(2)O)(H(2)O)(2)], contains two 4-(dimethyl-amino)benzoate (DMAB) ligands, one isonicotinamide (INA) ligand and two water mol-ecules; one of the DMAB ions acts as a bidentate ligand while the other and INA are monodentate ligands. The four O atoms in the equatorial plane around the Zn atom form a distorted square-planar arrangement, while the distorted octa-hedral coordination is completed by the N atom of the INA ligand and the O atom of the water mol-ecule in the axial positions. Intra-molecular C-H⋯O hydrogen bonding results in the formation of a six-membered ring adopting an envelope conformation.

Diaqua-bis[4-(dimethyl-amino)-benzoato]-κO,O';κO-(isonicotinamide-κN)cobalt(II).

The title Co(II) complex, [Co(C(9)H(10)NO(2))(2)(C(6)H(6)N(2)O)(H(2)O)(2)], contains two 4-dimethyl-amino-benzoate (DMAB) anions, one isonicotinamide (INA) ligand and two coordinated water mol-ecules. One of the DMAB anions acts as a bidentate ligand, while the other is monodentate. The four O atoms in the equatorial plane around the Co atom form a highly distorted square-planar arrangement, while the distorted octa-hedral coordination geometry is completed by the N atom of the INA ligand and the O atom of the second water mol-ecule in the axial positions.

catena-Poly[[[diaqua-bis[4-(diethyl-amino)benzoato-κO]manganese(II)]-μ-aqua] dihydrate].

In the crystal structure of the title complex, {[Mn(C(11)H(14)NO(2))(2)(H(2)O)(3)]·2H(2)O}(n), the two independent Mn(II) atoms are located on a centre of symmetry and coordinated by two 4-(diethyl-amino)benzoate (DEAB) anions and two water mol-ecules in the basal plane while another water mol-ecule bridges the Mn atoms in the apical directions, forming polymeric chains. The dihedral angles between the carboxyl-ate groups and the adjacent benzene rings are 11.33 (13) and 10.

Tetra-kis[μ-4-(dimethyl-amino)benzoato-κO:O']bis-[(N,N-diethyl-nicotinamide-κN)zinc(II)].

The title mol-ecule, [Zn(2)(C(9)H(10)NO(2))(4)(C(10)H(14)N(2)O)(2)], is a centrosymmetric binuclear complex, with Zn atoms [Zn⋯Zn' = 2.8927 (4) Å] bridged by four carboxyl-ate groups from the dimethyl-amino-benzoate (DMAB) ligands. The four carboxyl O atoms around the Zn atom form a distorted square-planar arrangement; the distorted square-pyramidal coordination geometry is completed by the pyridine N atom of the N,N-diethyl-nicotinamide (DENA) ligand.

Bis(isonicotinamide-κN)bis-[4-(methyl-amino)benzoato]zinc(II) monohydrate.

In the title Zn(II) complex, [Zn(C(8)H(8)NO(2))(2)(C(6)H(6)N(2)O)(2)]·H(2)O, the Zn atom is coordinated by two 4-methyl-amino-benzoate (MAB) and two isonicotinamide (INA) ligands in a distorted trigonal-bipyramidal geometry; one of the MAB ions acts as a bidentate ligand while the other MAB and the two INA are monodentate ligands. The dihedral angles between the carboxyl groups and the adjacent benzene rings are 8.52 (22) and 5.

Tetra-kis[μ-4-(methyl-amino)-benzoato-κO:O']bis-[(N,N-diethyl-nicotinamide-N)zinc(II)] dihydrate.

The title mol-ecule, [Zn(2)(C(8)H(8)NO(2))(4)(C(10)H(14)N(2)O)(2)]·2H(2)O, is a centrosymmetric binuclear complex, with two Zn(II) ions [Zn⋯Zn' = 2.9301 (4) Å] bridged by four methyl-amino-benzoate (MAB) ligands. The four nearest O atoms around each Zn(II) ion form a distorted square-planar arrangement with the distorted square-pyramidal coordination completed by the pyridine N atom of the N,N-diethyl-nicotinamide (DENA) ligand.

4-(Methyl-amino)benzoic acid.

The asymmetric unit of the title compound, C(8)H(9)NO(2), contains three crystallographically independent mol-ecules, which are essentially planar, the carboxyl O atoms deviating by 0.091 (3), 0.101 (2) and 0.

Diaqua-bis-(N,N-diethyl-nicotinamide-κN)bis[4-(dimethyl-amino)-benzoato-κO]cobalt(II).

The title Co(II) complex, [Co(C(9)H(10)NO(2))(2)(C(10)H(14)N(2)O)(2)(H(2)O)(2)], is centrosymmetric. It contains two dimethyl-amino-benzoate (DMAB) and two diethyl-nicotinamide (DENA) ligands and two water mol-ecules, all of them being monodentate. The four O atoms in the equatorial plane around the Co atom form a slightly distorted square-planar arrangement, while the slightly distorted octa-hedral coordination is completed by the two pyridine N atoms of DENA ligands with the Co-N distance of 2.

Diaqua-bis[4-(dimethyl-amino)benzoato-κO](isonicotinamide-κN)manganese(II).

The title Mn(II) complex, [Mn(C(9)H(10)NO(2))(2)(C(6)H(6)N(2)O)(H(2)O)(2)], contains two 4-(dimethylamino)benzoate (DMAB) anions, one isonicotinamide (INA) ligand and two coordinated water mol-ecules. One of the DMAB anions acts as a bidentate ligand, while the other is monodentate. The four O atoms in the equatorial plane around the Mn atom form a highly distorted square-planar arrangement, while the distorted octa-hedral coordination geometry is completed by the N atom of the INA ligand and the O atom of the second water mol-ecule in the axial positions.

Bis[4-(methyl-amino)benzoato-κO]bis-(nicotinamide-κN)zinc(II).

The title zinc complex, [Zn(C(8)H(8)NO(2))(2)(C(6)H(6)N(2)O)(2)], is composed of two monodentate 4-(methyl-amino)benzoate and two monodentate nicotinamide ligands. The coordination around the Zn atom is distorted tetra-hedral. The dihedral angles between the two benzene rings and the two pyridine rings are 78.