Farba Bouyagui Tamboura

Synthesis, properties and X-ray structure for the mononuclear complex of [{(1-methyl imidazol-2-yl)methylene}-2-aminoethylpyridine]-dichloro copper (II) monohydrate

Abstract The crystal structure of the title complex, [CuCl2(C12H14N4)(H2O)], is composed of discrete molecules. The Cu(II) atom is coordinated by two chloride ligands and three nitrogen atoms from the ligand in a distorted tetragonal pyramidal coordination environment with Cu–N distances of 2.053(2), 2.0023(2) and 2.035(2) A, Cu–Cl distances of 2.538(1) A and 2.302(1) A and N–Cu–N of 90.97(0.07), 167.16(0.07) and 80.32(0.07)° and Cl–Cu–Cl angles of 106.90 (0.003)°.

X-ray structure and spectroscopic properties of some lanthanides(III) complexes derived from 2,6-diacetylpyridine-bis(benzoylhydrazone)

Abstract A series of trivalent lanthanide complexes of type [Ln(L) NO 3 )(S) n ](NO 3 ) m (S ′ ) n , have been synthesized by the reaction of 2,6-diacetylpyridine-bis-(benzoylhydrazone) (H 2 L) with lanthanide(III) nitrates in ethanol. These complexes have been characterized by analysis, molar conductance, magnetic measurements, infrared spectral studies and X-ray diffraction. The analytical data revealed the formation of 1:1 (metal:ligand) stoichiometry. Molar conductance in dmf gives 2:1 electrolytes in all the complexes. Magnetic moment values are close proximity of the Van Vleck values. IR study suggests the coordination of the ligand through the azomethine and the oxygen of the hydrazonic moiety. The nitrate ion is also found to be bidentate in all the complexes. The crystal structures were determined. 6 , C 27 H 31 N 6 O 7 S 2 Gd: a = b =8.6821(4) A, c =84.363(5) A, tetragonal P 4 1 2 1 2 and Z =8. bf 7, C 25 H 25 N 6 O 6 SDy: a =11.750(3) A, b =13.250(3) A, c =36.000(6) A, β =98.50(2), monoclinic, C 2/ c , Z =8. 9 , C 24 H 25 N 6 O 7 Yb: a =10.750(2) A, b =17.750(3) A, c =14.250(4) A, β =99.00(2), monoclinic, P 2 1 / n , Z =4. In these complexes the lanthanide ion assumes a nine coordinated geometry for Gd and an eight coordinated geometry for Dy and Yb.

The cocrystal μ-oxalato-κ4O1,O2:O1′,O2′-bis­(aqua­(nitrato-κO){[1-(2-pyridyl-κN)eth­ylidene]hydrazine-κN}copper(II)) μ-oxalato-κ4O1,O2:O1′,O2′-bis­((methanol-κO)(nitrato-κO){[1-(2-pyridyl-κN)eth­ylidene]hydrazine-κN}copper(II)) (1/1)

The title cocrystal, [Cu2(C2O4)(NO3)2(C7H9N3)2(H2O)2][Cu2(C2O4)(NO3)2(C7H9N3)2(CH4O)2], is a 1:1 cocrystal of two centrosymmetric CuII complexes with oxalate dianions and Schiff base ligands. In each molecule, the CuII centre is in a distorted octahedral cis-CuN2O4 environment, the donor atoms of the N,N′-bidentate Schiff base ligand and the bridging O,O′-bidentate oxalate group lying in the equatorial plane. In one molecule, a monodentate nitrate anion and a water molecule occupy the axial sites, and in the other, a monodentate nitrate anion and a methanol molecule occupy these sites. In the crystal structure, intermolecular N—H⋯O, O—H⋯O and N—H⋯N hydrogen bonds link the molecules into a network. Weak intramolecular N—H⋯O interactions are also observed.

Chlorido[N'-(2-oxidobenzil-idene)acetohydrazide-κO,N',O']copper(II) dihydrate.

In the title complex, [Cu(C9H9N2O2)Cl]·2H2O, prepared from the Schiff base ligand N′-(2-hydroxybenzilidene)acetohydrazide and copper(II) chloride, the CuII atom is coordinated by two O atoms and one N atom from the ligand and by a Cl atom in a distorted square-planar geometry. The two donor O atoms of the tridentate Schiff base ligand are in a trans arrangement. In the crystal structure, there is an extensive intermolecular hydrogen-bonding network; N—H⋯O, O—H⋯O and O—H⋯Cl interactions, involving the uncoordinated water molecules, lead to the formation of a two-dimensional network parallel to the ab plane.

Aqua­{2-(pyridin-2-yl)-N-[(pyridin-2-yl)methyl­idene]ethanamine-κ3N,N′,N′′}(sulfato-κ2O,O′)copper(II) tetra­hydrate

The title complex, [Cu(SO4)(C13H13N3)(H2O)]·4H2O, was obtained by mixing copper sulfate pentahydrate and 2-(pyridin-2-yl)-N-(pyridin-2-ylmethylidene)ethanamine in ethanol under reflux conditions. The CuII ion shows a Jahn–Teller-distorted octahedral geometry, with equatorial positions occupied by three N atoms from the tridentate ligand (average Cu—N = 2.004 Å) and one O atom from a bidentate sulfate anion [Cu—O = 1.963 (2) Å]. The axial positions are occupied by one O atom from a coordinating water molecule [Cu—O = 2.230 (3) Å] and one weakly bonded O atom [Cu—O = 2.750 (2) Å] from the bidentate sulfate ion. The complex molecules are connected through O—H⋯O hydrogen bonds between the coordinating water molecules and sulfate ions from neighboring complexes, forming a double chain parallel to the c axis. The chains are stabilized through additional hydrogen bonds by one of the non-coordinating water molecules bridging between neighboring strands of the double chains. The remaining three water molecules fill the interstitial space between the double chains and are involved in an intricate hydrogen-bonding network that consolidates the structure.

Bis{2-amino-2-oxo-N-[(1E)-1-(pyridin-2-yl-κN)ethyl­idene]acetohydrazidato-κ2N′,O1}nickel(II)

In the title compound, [Ni(C9H9N4O2)2], the NiII ion is situated on a twofold rotation axis and is coordinated by two O and four N atoms from two tridentate {2-amino-2-oxo-N-[(1E)-1-(pyridin-2-yl-κN)ethylidene]acetohydrazidate ligands in a distorted octahedral geometry. In the crystal, N—H⋯O and N—H⋯N hydrogen bonds link the molecules into columns in [001]. The porous crystal packing is further stabilized via π–π interactions between the pyridine rings of neighbouring molecules [centroid–centroid distance = 3.746 (3) Å] with voids of 270 Å3.

{μ-N,N′-Bis[1-(2-pyridyl)ethylidene]benzene-1,2-diamine}di-μ-chlorido-bis[diaquanickel(II)] dichloride ethanol disolvate

In the title compound, [Ni2Cl2(C20H18N4)(H2O)4]Cl2·2C2H6O, the coordination environment of each Ni2+ ion is distorted octahedral formed by two N atoms from the Schiff base ligand, two O atoms from water molecules and two chloride anions acting as μ2 bridges between the metal ions. The coordinated water molecules are linked to the uncoordinated ethanol molecules and chloride anions by O—H⋯O and O—H⋯Cl hydrogen bonds, although the assignment of some of these is tentative. A weak intermolecular O—H⋯N interaction within the ligand is also observed.

Chlorido[N′-(2-oxidobenzil­idene)acetohydrazide-κ2O,N′,O′]copper(II) dihydrate

In the title complex, [Cu(C9H9N2O2)Cl]·2H2O, prepared from the Schiff base ligand N′-(2-hydroxybenzilidene)acetohydrazide and copper(II) chloride, the CuII atom is coordinated by two O atoms and one N atom from the ligand and by a Cl atom in a distorted square-planar geometry. The two donor O atoms of the tridentate Schiff base ligand are in a trans arrangement. In the crystal structure, there is an extensive intermolecular hydrogen-bonding network; N—H⋯O, O—H⋯O and O—H⋯Cl interactions, involving the uncoordinated water molecules, lead to the formation of a two-dimensional network parallel to the ab plane.

Chlorido[N′-(2-oxidobenzilidene)acetohydrazide-κ2O,N′,O′]copper(II) dihydrate

In the title complex, [Cu(C9H9N2O2)Cl]·2H2O, prepared from the Schiff base ligand N′-(2-hydroxybenzilidene)acetohydrazide and copper(II) chloride, the CuII atom is coordinated by two O atoms and one N atom from the ligand and by a Cl atom in a distorted square-planar geometry. The two donor O atoms of the tridentate Schiff base ligand are in a trans arrangement. In the crystal structure, there is an extensive intermolecular hydrogen-bonding network; N—H⋯O, O—H⋯O and O—H⋯Cl interactions, involving the uncoordinated water molecules, lead to the formation of a two-dimensional network parallel to the ab plane.

Bis(2-benzamidobenzimidazolato-κ2N1,O)(N,N-dimethylformamide-κO)copper(II)

In the title compound, [Cu(C14H10N3O)2(C3H7NO)], the CuII atom is five-coordinated by two N,O-bidentate 2-benzamidobenzimidazolate anions and one O-coordinated dimethylformamide (DMF) molecule, resulting in a distorted square-based pyramidal CuN2O3 geometry for the metal atom, with the DMF O atom at the apical site. In the crystal structure, intermolecular N—H⋯N hydrogen bonds result in chains of molecules propagating along [100].