Mohamed Gaye

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.

1,2-Bis(N'-benzoyl-thio-ureido)benzene.

The title compound, C22H18N4O2S2, was characterized by 1H and 13C NMR, solid-state IR spectroscopy and X-ray crystallographic techniques. The crystal structure determination reveals that the twisting modes of the two side arms are different [C—N—C—O and C—N—C—N torsion angles = −1.2 (3) and 1.1 (3)°, respectively, in one arm and 24.1 (3) and −5.1 (3)°, respectively, in the other]. The crystal structure involves N—H⋯O and N—H⋯S hydrogen bonds.

Synthesis and Use of Imidazolium Bound Rose Bengal Derivatives for Singlet Oxygen Generation

We describe the preparation and use of two new imidazolium-bound Rose Bengal derivatives for singlet oxy- gen generation. Photolysis of oxygen-saturated solution of furan rings in the presence of the imidazolium-bound sensitiz- ers provides the corresponding butenolides. The sensitizers could be recovered after the oxidation reaction.

Poly[di-μ-aqua-diaqua-di-μ6-malonato-cobalt(II)dipotassium(I)]

In the title complex, [CoK2(C3H2O4)2(H2O)4]n, the Co atom is located on a position with site symmetry 2/m, the K atom and one water molecule are located on a mirror plane, and the malonate and one water molecule are located on a twofold rotation axis. The KI atom is seven-coordinated by four carboxylate O atoms from four malonate ligands and by three water O atoms, forming a distorted polyhedron. The CoII atom is in an almost octahedral environment formed by four carboxylate O atoms from two malonate ligands and two water O atoms. The structure consists of layers parallel to (20) built up from edge-sharing KO7 and CoO6 polyhedra, which are connected by O—H⋯O hydrogen bonding including water molecules into a three-dimensional network.

1,5-Bis(2-hy-droxy-3-meth-oxy-benzyl-idene)carbonohydrazide methanol 0.47-solvate.

In the title compound, C17H18N4O5·0.47CH3OH, the virtually planar (r.m.s. deviation = 0.128 Å) carbonohydrazide molecule is located on a twofold axis and conformation of its C=N bonds is E. There are short intramolecular O—H⋯N hydrogen bonds between the hydroxy groups and hydrazide N atoms. In the crystal, bifurcated N—H⋯(O,O) hydrogen bonds assemble the carbonohydrazide molecules into a three-dimensional network. There are C 2 symmetric voids in this network, 47% of which are occupied by disordered methanol molecules.

4,6-Dimethyl-2-thioxo-1,2-dihydro­pyrimidin-3-ium chloride–thio­urea (1/1)

In the title compound, C6H9N2S+·Cl−·CH4N2S, the 4,6-dimethyl-2-thioxo-1,2-dihydropyrimidin-3-ium cation is protonated at one of the pyrimidine N atoms. The cations are bridged by the chloride anions through a pair of N—H⋯Cl hydrogen bonds. The amino groups of each thiourea adduct interact with the chloride anions through a pair of N—H⋯Cl hydrogen bonds and the S atom of another thiourea adduct through a pair of N—H⋯S hydrogen bonds. These interactions result in a layered hydrogen-bonded network propagating parallel to the bc plane. Except for two H atoms, all atoms are on special positions.

3,3'-Dibenzoyl-1,1'-(3,6-dioxaoctane-1,8-di-yl)dithio-urea.

In the molecule of the title compound, C22H26N4O4S2, the central O—CH2—CH2—O chain adopts a synclinal conformation [torsion angle = 65.0 (2)°]. The crystal structure is stabilized by intramolecular N—H⋯O=C and intermolecular N—H⋯O—C hydrogen bonds.

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.

Crystal structure of bis­(acetato-κ2O,O′)di­aqua­[1-(pyridin-2-yl­methyl­idene-κN)-2-(pyridin-2-yl-κN)hydrazine-κN1]terbium(III) nitrate monohydrate

The Tb3+ ion is nine-coordinated in a distorted tricapped trigonal-prismatic geometry by the three N atoms of the tridentate 1-(pyridin-2-ylmethylidene)-2-(pyridin-2-yl)hydrazine ligand, four carboxylate O atoms of two chelating acetate groups and two O atoms of the coordinated water molecules. In the crystal, the complex cations are linked by pairs of O—H⋯O hydrogen bonds into dimers. These dimers, nitrate anions and non-coordinating water molecules are joined by O—H⋯O and N—H⋯O hydrogen bonds into a three-dimensional structure.