catena-Poly[[[bis-(4-ethyl-benzoato-κO,O')lead(II)]-µ-nicotinamide-κN:O] monohydrate].

In the crystal structure of the polymeric title compound, {[Pb(C(9)H(9)O(2))(2)(C(6)H(6)N(2)O)]·H(2)O}(n), the six-coordinate Pb(II) ion is chelated by two 4-ethyl-benzoate (PEB) anions and is bridged by two nicotinamide (NA) ligands, forming a polymeric chain running along the b axis. The carboxyl-ate 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 carboxyl-ate groups via N-H⋯O hydrogen bonding. In the crystal, adjacent polymeric chains inter-act via N-H⋯O and weak C-H⋯O hydrogen bonds; and the lattice water mol-ecule 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 inter-actions are also observed in the crystal structure.

Diaqua-bis-(N,N'-diethyl-nicotinamide-κN)bis-(4-ethyl-benzoato-κO)copper(II).

The title Cu(II) complex, [Cu(C(9)H(9)O(2))(2)(C(10)H(14)N(2)O)(2)(H(2)O)(2)], contains two 4-ethyl-benzoate (PEB) ligands, two monodentate diethyl-nicotinamide (DENA) ligands and two water mol-ecules. The four O atoms in the equatorial plane around the Cu(II) ion form a slightly distorted square-planar arrangement, while the distorted octa-hedral coordination is completed by the two N atoms of the DENA ligands in the axial positions. Intra-molecular O-H⋯O hydrogen bonds link the water mol-ecules to the carboxyl-ate groups. The dihedral angles between the carboxyl-ate groups and the adjacent benzene rings are 4.6 (3) and 3.7 (2)°, while the pyridine rings and the benzene rings are oriented at dihedral angles of 6.82 (11) and 3.63 (14)°. In the crystal, inter-molecular O-H⋯O hydrogen bonds link the mol-ecules into chains propagating along [010]. C-H⋯O inter-actions and a π-π contact between the pyridine rings [centroid-centroid distance = 3.469 (2) Å] are also observed.

Bis(4-ethyl-benzoato-κO)bis-(nicotin-amide-κN)zinc(II).

The title Zn(II) complex, [Zn(C(9)H(9)O(2))(2)(C(6)H(6)N(2)O)(2)], contains two 4-ethyl-benzoate and two nicotinamide monodentate ligands, leading to a distorted tetrahedral coordination of the Zn(II) ion. The dihedral angles between the carboxyl-ate groups and the adjacent benzene rings are 10.33 (13) and 2.38 (11)°, while opposite pyridine and benzene rings are oriented at dihedral angles of 68.46 (5) and 81.09 (6)°. In the crystal, inter-molecular N-H⋯O hydrogen bonds link the mol-ecules, forming a three-dimensional network. C-H⋯O inter-actions also occur as well as two weak C-H⋯π inter-actions involving the benzene rings.