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  • Küçük Resim
    Öğe
    Catena-Poly[[aquabis(3-chlorobenzoato-K2 O,O')cadmium]-µ-N,N-diethylnicotinamide-K2 N 1:O]
    (2013) Bozkurt, Nihat; Tunç, Tuncay; Çaylak Delibaş, Nagihan; Necefoglu, Hacali; Hökelek, Tuncer
    In the crystal of the title CdII polymeric complex, [Cd(C7H4ClO2)2(C10H14N2O)(H2O)] n , the CdII cation is chelated by two chlorobenzoate anions and coordinated by two N,N-diethylnicotinamide (DENA) ligands and one water molecule in a distorted NO6 pentagonal-bipyramidal geometry. The CdII cations are bridged by the pyridine N atom and carbonyl O atom of the DENA ligand to form a polymeric chain running along the b axis. Intermolecular O - H?O hydrogen bonds between coordinating water molecules and carboxylate groups link adjacent chains into layers parallel to the bc plane. ?-? contacts between benzene rings [shortest centroid-centroid distance = 3.912 (2) Å] further stabilizes the crystal structure. In the molecule, weak C - H?O hydrogen bonds occur between the pyridine ring and carboxylate groups; the dihedral angles between the carboxylate groups and adjacent benzene rings are 4.6 (3) and 12.8 (3)°, while the benzene rings are oriented at a dihedral angle of 1.89 (13)°.
  • Küçük Resim
    Öğe
    Catena-Poly[[aquabis(4-formylbenzoato-K 2 O 1 ,O 1' )cadmium]-µ-pyrazine-K 2 N:N']
    (2014) Çelik, Fatih; Dilek, Nefise; Çaylak Delibaş, Nagihan; Necefoglu, Hacali; Hökelek, Tuncer
    The polymeric title compound, [Cd(C8H5O3)2(C4H4N2)(H2O)] n , contains two 4-formylbenzoate (FB) anions, one pyrazine molecule and one coordinating water molecule; the FB anions act as bidentate ligands. The O atom, the aldehyde H atom and the benzene ring of one of the FB anions are disordered over two positions. The O atoms were freely refined [refined occupancy ratio 0.79(2):0.21(2)], while the aldehyde H atoms and the benzene ring atoms were refined with fixed occupancy ratios of 0.8:0.2 and 0.5:0.5, respectively. In the ordered FB anion, the carboxylate group is twisted away from the attached benzene ring (A) by 22.7(8)°. In the disordered FB anion, the corresponding angles are 15.6(10) and 11.4(11)° for rings B and B', respectively. Benzene rings A and B are oriented at a dihedral angle of 24.2(7), A and B' at 43.0(8)°. The pyrazine ring makes dihedral angles of 67.5(4), 89.6(7) and 86.2(7)°, respectively, with benzene rings A, B and B'. The pyrazine ligands bridge the Cd II cations, forming polymeric chains running along the b-axis direction. In the crystal, O - Hwater Ocarboxylate hydrogen bonds link adjacent chains into layers parallel to the bc plane. These layers are linked via C - Hpyrazine Oformyl hydrogen bonds, forming a three-dimensional network. ?-? interactions [centroid-centroid distances = 3.870(11)-3.951(5)Å] further stabilize the crystal structure. There is also a weak C - H? interaction present. © Çelik et al. 2014.