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    9-Benzyl-9H-carbazole
    (Int Union Crystallography, 2010) Uludag, Nesimi; Ates, Murat; Tercan, Baris; Ermis, Emel; Hoekelek, Tuncer
    The asymmetric unit of the title compound, C19H15N, contains two crystallographically independent molecules. In both molecules, the planar carbazole moieties [maximum deviations = 0.037 (4) and 0.042 (3) angstrom] are oriented with respect to the adjacent benzene rings, at dihedral angles of 85.29 (8) and 89.89 (7)degrees, respectively. In the crystal structure, weak C-H center dot center dot center dot pi interactions are observed involving the carbazole rings.
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    Bis(4-methoxybenzoato)-?2O,O?;?O-bis(nicotinamide-?N1)zinc(II)
    (Wiley-Blackwell, 2010) Hoekelek, Tuncer; Saka, Guener; Tercan, Baris; Tenlik, Erdinc; Necefoglu, Hacali
    The asymmetric unit of the title complex, [Zn(C8H7O3)(2)-(C6H6N2O)(2)], contains three crystallographically independent molecules with similar configurations. The Zn-II cation is coordinated by two N atoms of two nicotinamide ligands and three O atoms from two 4-methoxybenzoate anions in a distorted trigonal-bipyramidal geometry. In each independent molecule, one Zn-O bond distance [2.5181 (12), 2.5931 (12) and 2.4085 (12) angstrom for the three molecules] is significantly longer than the other two. In the crystal structure, extensive N-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonding links the molecules into a three-dimensional network. pi-pi contacts between the pyridine rings and between the pyridine and benzene rings [centroid-centroid distances = 3.7655 (9) and 3.8453 (10) angstrom, respectively] further stabilize the crystal structure.
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    Bis[4-(methylamino)benzoato-?O]bis(nicotinamide-?N)zinc(II)
    (Int Union Crystallography, 2009) Tercan, Baris; Hoekelek, Tuncer; Aybirdi, Oezguer; Necefoglu, Hacali
    The title zinc complex, [Zn(C8H8NO2)(2)(C6H6N2O)(2)], is composed of two monodentate 4-(methylamino) benzoate and two monodentate nicotinamide ligands. The coordination around the Zn atom is distorted tetrahedral. The dihedral angles between the two benzene rings and the two pyridine rings are 78.30 (6) and 68.86 (5)degrees. In the crystal structure, intermolecular N-H center dot center dot center dot O hydrogen bonds link the molecules into an infinite three-dimensional network.
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    catena-Poly[[[diaquabis[4-(diethylamino)benzoato-?O]manganese(II)]-?-aqua] dihydrate]
    (Int Union Crystallography, 2009) Hoekelek, Tuncer; Dal, Hakan; Tercan, Baris; Aybirdi, Oezguer; Necefoglu, Hacali
    In the crystal structure of the title complex, {[Mn(C11H14NO2)(2)(H2O)(3)]center dot 2H(2)O}(n), the two independent Mn-II atoms are located on a centre of symmetry and coordinated by two 4-(diethylamino) benzoate (DEAB) anions and two water molecules in the basal plane while another water molecule bridges the Mn atoms in the apical directions, forming polymeric chains. The dihedral angles between the carboxylate groups and the adjacent benzene rings are 11.33 (13) and 10.90 (9)degrees and the benzene rings are oriented at a dihedral angle of 67.88 (6)degrees. The uncoordinated water molecules link the carboxylate groups and coordinated water molecules via O-H center dot center dot center dot O hydrogen bonding. Weak C-H center dot center dot center dot pi interactions are also found in the crystal structure.
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    Diaquabis(2-chlorobenzoato-?O)bis(nicotinamide-?N1)nickel(II)
    (Int Union Crystallography, 2009) Hoekelek, Tuncer; Dal, Hakan; Tercan, Baris; Oezbek, F. Elif; Necefoglu, Hacali
    The title Ni-II complex, [Ni(C7H4ClO2)(2)(C6H6N2O)(2)(H2O)(2)], is centrosymmetric with the Ni atom located on an inversion centre. The molecule contains two 2-chlorobenzoate (CB) and two nicotinamide (NA) ligands and two water molecules, 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 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 29.48 (16)degrees, while the pyridine and benzene rings are oriented at a dihedral angle of 83.16 (5)degrees. In the crystal structure, O-H center dot center dot center dot O and N-H center dot center dot center dot O hydrogen bonds link the molecules into infinite chains. pi-pi Contacts between the benzene and pyridine rings [centroid-centroid distance = 3.952 (1) angstrom] may further stabilize the crystal structure. There is also a C-H center dot center dot center dot pi interaction.
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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-?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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    Diaquabis(N,N-diethylnicotinamide-?N1)bis[4-(dimethylamino)benzoato-?O]nickel(II)
    (Int Union Crystallography, 2009) Hoekelek, Tuncer; Suezen, Yasemin; Tercan, Baris; Aybirdi, Oezguer; Necefoglu, Hacali
    The centrosymmetric title Ni-II complex, [Ni(C9H10NO2)(2)-(C10H14N2O)(2)(H2O)(2)], contains two dimethylaminobenzoate (DMAB), two diethylnicotinamide (DENA) ligands and two water molecules, 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 octahedral coordination is completed by the two pyridine N atoms of the DENA ligands in axial positions. The Ni-II atom is displaced by 0.681 (1) angstrom out of the least-squares plane of the carboxylate group. The dihedral angle between the carboxylate group and the adjacent benzene ring is 5.61 (7)degrees, while the pyridine and benzene rings are oriented at a dihedral angle of 73.20 (4)degrees. An intramolecular O-H center dot center dot center dot O hydrogen bond results in the formation of a six-membered ring with a twisted conformation. In the crystal structure, intermolecular O-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds link molecules into a three-dimensional network. Two weak C-H center dot center dot center dot pi interactions are also present.
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    Tetrakis[?-4-(diethylamino)benzoato-?2O:O?]bis[(N,N-diethylnicotinamide-?N1)zinc(II)]
    (Int Union Crystallography, 2009) Hoekelek, Tuncer; Yilmaz, Filiz; Tercan, Baris; Aybirdi, Oezguer; Necefoglu, Hacali
    In the centrosymmetric binuclear title complex, [Zn-2(C11H14NO2)(4)(C10H14N2O)(2)], the two Zn-II ions [Zn center dot center dot center dot Zn = 2.8874 (3) angstrom] are bridged by four 4-(diethylamino)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-diethylnicotinamide (DENA) ligand at a distance of 2.0484 (12) angstrom. The dihedral angle between the benzene ring and the carboxylate group is 4.89 (6)degrees in one of the independent DEAB ligands and 7.13 (7)degrees in the other. The benzene rings of the two independent DEAB ligands are oriented at a dihedral angle of 86.58 (5)degrees. The pyridine ring is oriented at dihedral angles of 31.17 (4) and 58.38 (4)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. Two weak C-H center dot center dot center dot pi interactions are also present. The two ethyl groups of one of the DEAB ligands are disordered over two orientations, with occupancy ratios of 0.798 (5): 0.202 (5) and 0.890 (5): 0.110 (5).