Hydrothermal synthesis and characterization of a binuclear complex and a coordination polymer of copper(II)

Two new copper complexes [(bipy)(pydc)Cu(µ-OCO-pydc)Cu(bipy)(H2O)].3.5H­2O (1) and {[(µ2-C2O4)(2,2'-bipy)Cu].2H2O}n (2) (pydcH2 = pyridine-2,6-dicarboxylilic acid, bipy = 2,2'-bipyridine) have been hydrothermally synthesized. Both complexes were characterized by IR spectroscopy, elemental analysis and single crystal X-ray diffraction studies. Complex 1 consists of two independent neutral molecules. In every moiety, metal ion center is in a distorted octahedral geometry. Coordination polymer (2) has been prepared from the reaction of bis-(cyclohexanone)-oxal-dihydrazone,2,2'-bipyridine and Cu(NO3)2 in basic solution and under hydrothermal condition. The results showed that the bis-(cyclohexanone)-oxal-dihydrazone was converted to oxalate ion under heating and basic pH. Each metal ion center in 2 is in a distorted octahedral geometry and is coordinated by four oxygen atoms of two bridged oxalate ions and two nitrogen atoms of 2,2'-bipyridine molecules. In the crystal structure of 2, some H-bonds and π-π interaction cause formation of a 3D network. KEY WORDS: Hydrothermal synthesis, Cu complex, Coordination polymer, Crystal structure  Bull. Chem. Soc. Ethiop. 2010, 24(3), 401-409

2-Thienylcarbonylmethylene–triphenylphosphorane ylide

In the mol­ecule of the title compound, (2-thienylcarbon­yl)(triphenyl­phospho­nio)methanide, C24H19OPS, the geometry around the P atom is nearly tetra­hedral and the O—C—C—P torsion angle is 2.80 (3)°. The thio­phene ring is twisted through an angle of 4.33 (4)° with respect to the plane of the carbonyl group. Inter- and intra­molecular hydrogen bonds and C—H⋯π inter­actions are present in the crystal structure

Bis(propane-1,2-diammonium) benzene-1,2,4,5-tetra­carboxyl­ate dihydrate

In the crystal of the title hydrated molecular salt, 2C3H12N2 2+·C10H2O8 4−·2H2O, the packing is stabilized by extensive N—H⋯O and O—H⋯O hydrogen-bonding inter­actions involving all three species, forming a supra­molecular three-dimensional structure. The tetraanion is generated by inversion

catena-Poly[[(dimethyl­formamide-κO)copper(II)]-bis­(μ-4-nitro­phenyl­cyanamido-κ2 N 1:N 3)]

In the title compound, [Cu(C7H4N3O2)2(C3H7NO)], the CuII atom is five-coordinated in a distorted square-pyramidal geometry, with the N atoms in equatorial positions and the dimethyl­formamide O atom in an axial position. The dihedral angle between adjacent benzene rings is 70.33 (12)°

(2,2′-Biquinoline-κ2 N,N′)dichlorido­iron(II)

In the title compound, [FeCl2(C18H12N2)], the FeII atom is four-coordinated in a distorted tetra­hedral arrangement by an N,N′-bidentate 2,2′-biquinoline ligand and two chloride ions. In the crystal, there are extensive π–π contacts between the pyridine rings [centroid–centroid distances = 3.7611 (3), 3.7603 (4), 3.5292 (4), 3.5336 (5) and 3.6656 (4) Å]

Di-μ-ethano­lato-bis­[diethano­lato(2-methyl­quinolin-8-olato)titanium(IV)]

In the centrosymmetric dinuclear title compound, [Ti2(C10H8NO)2(C2H5O)6], the Ti atom is bonded to an N,O-bidentate quinolin-8-olate ligand, two terminal ethano­late anions and two bridging ethano­late anions in a distorted TiNO5 octa­hedral geometry. An intra­molecular C—H⋯O hydrogen bond occurs; in the crystal, inter­molecular C—H⋯O inter­actions help to establish the packing

Di-μ-bromido-bis­[bromido(4,4′-dimethyl-2,2′-bipyridine-κ2 N,N′)mercury(II)]

The asymmetric unit of the title compound, [Hg2Br4(C12H12N2)2], contains one half-mol­ecule. The HgII atom is five-coordinated in a trigonal–bipyramidal configuration by two N atoms from the chelating 4,4′-dimethyl-2,2′-bipyridine ligand, two bridging Br and one terminal Br atom, leading to a centrosymmetric dimeric mol­ecule. There is a π–π contact between the pyridine rings [centroid-to-centroid distance = 3.756 (5) Å]

(4,4′-Dimethyl-2,2′-bipyridine-κ2 N,N′)diiodidomercury(II)

In the mol­ecule of the title compound, [HgI2(C12H12N2)], the HgII atom is four-coordinated in a distorted tetra­hedral configuration by two N atoms from the 4,4′-dimethyl-2,2′-bipyridine ligand and by two I atoms. There is a π–π contact between the pyridine rings [centroid–centroid distance = 3.775 (6) Å]

2-[(1H-Imidazol-2-yl)disulfan­yl]-1H-imidazole

In the title molecule, C6H6N4S2, a twofold rotation axis passes through the mid-point of the S—S bond. The C—S—S—C torsion angle is 83.62 (17)°. π–π stacking between imidazole rings of adjacent mol­ecules is observed in the crystal structure, the centroid–centroid distance being 3.447 (2) Å. Inter­molecular N—H⋯S hydrogen bonding results in the formation of a linear chain in the c-axis direction