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    Bis(4-ethylbenzoato-?O)bis(nicotinamide-?N1)zinc(II)
    (Int Union Crystallography, 2011) Necefoglu, Hacali; Ozbek, Fureya Elif; Aktas, Vedat; Tercan, Baris; Hokelek, Tuncer
    The title Zn II complex, [Zn(C9H9O2)(2)(C6H6N2O)(2)], contains two 4-ethylbenzoate and two nicotinamide monodentate ligands, leading to a distorted tetrahedral coordination of the Zn-II ion. The dihedral angles between the carboxylate groups and the adjacent benzene rings are 10.33 (13) and 2.38 (11)degrees, while opposite pyridine and benzene rings are oriented at dihedral angles of 68.46 (5) and 81.09 (6)degrees. In the crystal, intermolecular N-H center dot center dot center dot O hydrogen bonds link the molecules, forming a three-dimensional network. C-H center dot center dot center dot O interactions also occur as well as two weak C-H center dot center dot center dot pi interactions involving the benzene rings.
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    catena-Poly[[[bis(4-ethylbenzoato-?2O,O')lead(II)]-?-nicotinamide-?2N1:O] monohydrate]
    (Int Union Crystallography, 2011) Hokelek, Tuncer; Tercan, Baris; Sahin, Ertan; Aktas, Vedat; Necefoglu, Hacali
    In the crystal structure of the polymeric title compound, {[Pb(C9H9O2)(2)(C6H6N2O)]center dot H2O}(n), the six-coordinate Pb-II 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)degrees. 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 N-A ligand is linked to one of the carboxylate groups via N-H center dot center dot center dot O hydrogen bonding. In the crystal, adjacent polymeric chains interact via N-H center dot center dot center dot O and weak C-H center dot center dot center dot O hydrogen bonds; and the lattice water molecule links with the polymeric chains via N-H center dot center dot center dot O and O-H center dot center dot center dot O hydrogen bonding. pi-pi stacking between the benzene and the pyridine rings [centroid-centroid distance = 3.805 (5) angstrom] and weak C-H center dot center dot center dot center dot pi interactions are also observed in the crystal structure.
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    Diaquabis(N,N'-diethylnicotinamide-?N 1)bis(4-ethylbenzoato-?O)copper(II)
    (Wiley-Blackwell, 2011) Necefoglu, Hacali; Maraci, Ali; Aktas, Vedat; Tercan, Baris; Hokelek, Tuncer
    The title CuII complex, [Cu(C9H9O2)(2)(C10H14N2O)(2)(H2O)(2)], contains two 4-ethylbenzoate (PEB) ligands, two monodentate diethylnicotinamide (DENA) ligands and two water molecules. The four O atoms in the equatorial plane around the CuII ion form a slightly distorted square-planar arrangement, while the distorted octahedral coordination is completed by the two N atoms of the DENA ligands in the axial positions. Intramolecular O-H...O hydrogen bonds link the water molecules to the carboxylate groups. The dihedral angles between the carboxylate groups and the adjacent benzene rings are 4.6 (3) and 3.7 (2)degrees, while the pyridine rings and the benzene rings are oriented at dihedral angles of 6.82 (11) and 3.63 (14)degrees. In the crystal, intermolecular O-H...O hydrogen bonds link the molecules into chains propagating along [010]. C-H...O interactions and a pi-pi contact between the pyridine rings [centroid-centroid distance = 3.469 (2) A] are also observed.