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    2-Ethyl-6,6-ethylenedisulfanediyl-7-methoxymethyl-1,2,3,4,5,6-hexahydro-1,5-methanoazocino[4,3-b]indol-3-one
    (Int Union Crystallography, 2010) Tercan, Baris; Sahin, Ertan; Patir, Sueleyman; Hokelek, Tuncer
    The title compound, C20H24N2O2S2, consists of a tetracyclic ring system containing an azocino skeleton with ethyl, dithiolane and methoxymethyl groups as substituents. The benzene and five-membered rings are nearly coplanar, with a dihedral angle of 2.78 (11)degrees. The dithiolane ring adopts an envelope conformation. In the crystal structure, intermolecular C-H center dot center dot center dot O hydrogen bonds link the molecules into chains nearly parallel to the c axis. Two C-H center dot center dot center dot pi interactions are also present.
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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-?N1)bis(4-formylbenzoato-?O)cobalt(II)
    (Int Union Crystallography, 2009) Sertcelik, Mustafa; Tercan, Baris; Sahin, Ertan; Necefoglu, Hacali; Hoekelek, Tuncer
    In the crystal structure of the title Co-II complex, [Co(C8H5O3)(2)(C10H14N2O)(2)(H2O)(2)], the metal centre is located on an inversion center and is coordinated by two 4-formylbenzoate (FOB), two diethylnicotinamide (DENA) ligands and two water molecules in a slightly distorted CoO4N2 octahedral geometry. In the crystal structure, O-H center dot center dot center dot O hydrogen bonds link the molecules into infinite chains. pi-pi contacts between the parallel pyridine rings of neighboring DENA ligands [centroid-centroid distance = 3.652 (3) angstrom] further stabilize the crystal structure.
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    Diaquabis(N,N-diethylnicotinamide-?N1)bis(4-formylbenzoato-?O)nickel(II)
    (Int Union Crystallography, 2009) Sertcelik, Mustafa; Tercan, Baris; Sahin, Ertan; Necefoglu, Hacali; Hokelek, Tuncer
    In the title centrosymmetric mononuclear Ni-II compound, [Ni(C8H5O3)(2)(C10H14N2O)(2)(H2O)(2)], the central Ni-II atom is coordinated by two O atoms from two 4-formylbenzoate (FOB) ligands, two O atoms from two water molecules and two N atoms from two diethylnicotinamide (DENA) ligands. The coordination geometry is slightly distorted octahedral, with four O atoms in the equatorial plane and two N atoms in axial positions. Intramolecular O-H center dot center dot center dot O hydrogen bonds are observed. In the crystal structure, molecules are linked into chains along the a axis by intermolecular O-H center dot center dot center dot O hydrogen bonds. The structure is further stabilized by pi-pi interactions between the pyridine rings of DENA units, with a centroid-centroid distance of 3.668 (2) angstrom.
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    Diaquabis(N,N-diethylnicotinamide-?N1)bis(4-formylbenzoato-?O1)manganese(II)
    (Int Union Crystallography, 2009) Sertcelik, Mustafa; Tercan, Baris; Sahin, Ertan; Necefoglu, Hacali; Hoekelek, Tuncer
    The title compound, [Mn(C8H5O3)(2)(C10H14N2O)(2)(H2O)(2)], contains one Mn-II atom lying on an inversion centre, two 4-formylbenzoate and two diethylnicotinamide ligands and two coordinated water molecules. All ligands are monodentate. The four O atoms around the Mn atom form a slightly distorted equatorial plane, while the distorted octahedral coordination is completed by the two N atoms in the axial positions. An intramolecular O-H center dot center dot center dot O hydrogen bond occurs in the complex. In the crystal structure, O-H center dot center dot center dot O hydrogen bonds link the molecules through an R-2(2)(16) ring motif, forming a one-dimensional chain along the a axis. The pi-pi contact between the pyridyl rings [centroid-centroid distance = 3.629 (2) angstrom] may further stabilize the structure.
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    Tetraaquabis(nicotinamide-?N1)cobalt(II) bis(2-fluorobenzoate)
    (Int Union Crystallography, 2009) Ozbek, F. Elif; Tercan, Baris; Sahin, Ertan; Necefoglu, Hacali; Hokelek, Tuncer
    The title complex, [Co(C6H6N2O)(2)(H2O)(4)](C7H4FO2)(2), contains one Co(II) atom (site symmetry (1) over bar), two monodentate nicotinamide (NA) ligands, four coordinated water molecules and two 2-fluorobenzoate (FB) anions. The four O atoms in the equatorial plane around the Co 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 carboxyl group and the adjacent benzene ring is 29.8 (3)degrees, while the pyridine and benzene rings are oriented at a dihedral angle of 7.97 (12)degrees. In the crystal structure, molecules are linked by O-H center dot center dot center dot O, N-H center dot center dot center dot O and N-H center dot center dot center dot F hydrogen bonds, forming an infinite three-dimensional network. pi-pi Contacts between the pyridine and benzene rings [centroid-centroid distance = 3.673 (3) angstrom] may further stabilize the crystal structure.