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    Bis[?-4-(methylamino)benzoato]-?3O,O?:O;?3O:O,O?-bis{aqua[4-(methylamino)benzoato-?2O,O?](nicotinamide-?N)cadmium(II)}
    (Wiley-Blackwell, 2010) Hokelek, Tuncer; Saglam, Ertugrul Gazi; Tercan, Baris; Aybirdi, Ozgur; Necefoglu, Hacali
    In the dinuclear centrosymmetric Cd-II compound, [Cd-2(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 center dot center dot center dot O, N-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds link the molecules into a three-dimensional network. pi-pi contacts between the pyridine rings [centroid-centroid distance = 3.965 (1) angstrom] may further stabilize the structure. A weak C-H center dot center dot center dot pi interaction also occurs.
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    Diaquabis[4-(dimethylamino)benzoato-?O]bis(nicotinamide-?N1)zinc(II) dihydrate
    (Int Union Crystallography, 2010) Hokelek, Tuncer; Saglam, Ertugrul Gazi; Tercan, Baris; Aybirdi, Ozgur; Necefoglu, Hacali
    In the centrosymmetric title structure, [Zn(C9H10NO2)(2)(C6H6N2O)(2)(H2O)(2)]-2H(2)O, the Zn II cation, located on an inversion center, is coordinated by two 4-(methylamino) benzoate anions, two nicotinamide ligands and two water molecules in a slightly distorted octahedral geometry. The dihedral angle between the carboxylate group and the attached benzene ring is 3.09 (9)degrees, while the pyridine and benzene rings are oriented at a dihedral angle of 77.10(4)degrees. The uncoordinated water molecule is linked to nicotinamide ligands by O-H center dot center dot center dot O hydrogen bonds. In the crystal, intermolecular N-H center dot center dot center dot O, O-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds link the molecules into a three-dimensional network. A weak N-H center dot center dot center dot pi interaction also occurs.
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    Tetrakis[?-4-(diethylamino)benzoato-?2O:O?]bis[(N,N-diethylnicotinamide-?N1)cobalt(II)]
    (Int Union Crystallography, 2011) Hokelek, Tuncer; Saglam, Ertugrul Gazi; Tercan, Baris; Aybirdi, Ozgur; Necefoglu, Hacali
    In the centrosymmetric binuclear title complex, [Co-2(C11H14-NO2)(4)(C10H14N2O)(2)], the two Co-II cations [Co center dot center dot center dot Co = 2.6199 (5) angstrom] are bridged by four 4-(diethylamino)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-diethylnicotinamide (DENA) ligand. The dihedral angle between the benzene ring and the carboxylate group is 7.06 (11)degrees in one of the independent DEAB ligands and 4.42 (9)degrees in the other. The benzene rings of the two independent DEAB ligands are oriented at a dihedral angle of 86.35 (8)degrees. The pyridine ring is oriented at dihedral angles of 31.43 (6) and 57.92 (7)degrees with respect to the two benzene rings. In the crystal, weak intermolecular C-H center dot center dot center dot O interactions link the molecules into a three-dimensional network. Weak C-H center dot center dot center dot pi interactions are also present in the crystal structure.