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Biphenyl-4,4'-dicarb-oxy-lic acid N,N-dimethyl-formamide monosolvate.

ABSTRACT: Biphenyl-4,4'-dicarb-oxy-lic acid was recrystallized from N,N-dimethyl-formamide (DMF) yielding the title compound, C(14)H(10)O(4)·2C(3)H(7)NO. The acid mol-ecules are located on crystallographic centres of inversion and are hydrogen bonded to DMF mol-ecules. These hydrogen-bonded units form infinite chains although there is no inter-action between the methyl groups of neighboring DMF mol-ecules.

SUBMITTER: Jakobsen S

PROVIDER: S-EPMC3007922 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Biphenyl-3,3'-dicarb-oxy-lic acid.

Project description:The asymmetric unit of the title compound, C(14)H(10)O(4), contains one half mol-ecule, the complete mol-ecule being generated by a twofold axis. The two benzene rings form a dihedral angle of 43.11?(5)°. Inter-molecular O-H?O hydrogen bonds link the mol-ecules into one-dimensional zigzag chains. These chains are further connected into two-dimensional supra-molecular layers by weak ?-? stacking inter-actions between neighbouring benzene rings, with centroid-centroid distances of 3.7648?(8)?Å.

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2,2'-(Biphenyl-4,4'-diyldi-oxy)diacetic acid N,N-dimethyl-formamide solvate.

Project description:In the crystal struture of the title compound, C(16)H(14)O(6)·C(3)H(7)NO, the two crystallographically independent benzene rings are coplanar [dihedral angle = 1.00?(2)°]. The crystal structure is stabilized by O-H?O hydrogen bonds between the diacid and the solvate dimethylformamide mol-ecule, resulting in the formation of a zigzag chain structure extending parallel to [001].

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Project description:In the title compound, 3C(10)H(8)N(2)·4C(7)H(5)NO(4), the asymmetric unit contains two mol-ecules of pyridine-3,5-dicarb-oxy-lic acid and one mol-ecule of 4,4'-bipyridine in general positions together with one mol-ecule of 4,4'-bipyridine lying across a centre of inversion, thus giving a 4:3 molar ratio of pyridine-3,5-dicarb-oxy-lic acid to 4,4'-bipyridine. The dihedral angle between the bipyridine rings on general positions is 21.2?(2)°. These mol-ecular units are linked by O-H?N hydrogen bonds forming an extended two-dimensional framework in the crystal.

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Di-?-chlorido-bis-[(2,2'-bipyridine-5,5'-dicarb-oxy-lic acid-?(2)N,N')chloridocopper(II)] dimethyl-formamide tetra-solvate.

Project description:In the title compound, [Cu(2)Cl(4)(C(12)H(8)N(2)O(4))(2)]·4C(3)H(7)NO, which contains a chloride-bridged centrosymmetric Cu(II) dimer, the Cu(II) atom is in a distorted square-pyramidal 4 + 1 coordination geometry defined by the N atoms of the chelating 2,2'-bipyridine ligand, a terminal chloride and two bridging chloride ligands. Of the two independent dimethyl-formamide mol-ecules, one is hydrogen bonded to a single -COOH group, while one links two adjacent -COOH groups via a strong accepted O-H?O and a weak donated C(O)-H?O hydrogen bond. Two of these last mol-ecules and the two -COOH groups form a centrosymmetric hydrogen-bonded ring in which the CH=O and the -COOH groups by disorder adopt two alternate orientations in a 0.44:0.56 ratio. These hydrogen bonds link the Cu(II) complex mol-ecules and the dimethyl-formamide solvent mol-ecules into infinite chains along [-111]. Slipped ?-? stacking inter-actions between two centrosymmetric pyridine rings (centroid-centroid distance = 3.63?Å) contribute to the coherence of the structure along [0-11].

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Biphenyl-2,2',4,4'-tetra-carb-oxy-lic acid monohydrate.

Project description:In the title compound, C(16)H(10)O(8)·H(2)O, the dihedral angle between the two benzene rings is 71.63?(5)°. In the crystal structure, pairs of inversion-related mol-ecules are stacked [mean inter-planar spacing = 3.5195?(18)?Å], and O-H?O and C-H?O hydrogen bonds create a three-dimensional network.

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(2,2'-Bipyridine-4,4'-dicarb-oxy-lic acid-?N,N')chlorido(2,2':6',2''-terpyridyl-?N,N',N'')ruthenium(II) perchlorate ethanol monosolvate monohydrate.

Project description:In the title compound, [RuCl(C(15)H(11)N(3))(C(12)H(8)N(2)O(4))]ClO(4)·C(2)H(5)OH·H(2)O, the geometry of the ClN(5) coordination set around the Ru(II) atom is close to octa-hedral, but distorted on account of the limited bite angles of the polypyridyl ligands. The complexes are linked by O-H?O hydrogen bonds between the carboxyl groups and the crystal lattice water mol-ecules into chains along [110]. Face-to-face stacking inter-actions are formed between terpyridine ligands, with inter-planar separations of 3.66?(1) and 3.42?(1)?Å, and between bipyridine-4,4'-dicarb-oxy-lic acid ligands, with inter-planar separations of 3.65?(1) and 3.72?(1)?Å. Three O atoms of the perchlorate ion are each disordered equally over two positions. The hy-droxy group of the ethanol mol-ecule is also disordered over two sites with refined occupancies of 0.794?(9) and 0.206?(9).

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Hexaaqua-cobalt(II) 3,3'-dicarb-oxy-biphenyl-4,4'-dicarboxyl-ate.

Project description:In the crystal structure of the title compound, [Co(H(2)O)(6)](C(16)H(8)O(8)), both the cation and anion are centrosymmetric. The Co cation displays a CoO(6) octa-hedral geometry formed by six water mol-ecules. In the anion, the two carboxyl groups are oriented at dihedral angles of 4.8?(5) and 10.4?(7)° with respect to the benzene ring. Very strong O-H?O hydrogen bonds between the protonated and deprotonated carboxylate groups occur. Neighbouring cations and anions are connected through O-H?O hydrogen bonds into a three-dimensional supra-molecular structure.

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