Abdou Salam Sall

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 IR study of some tin(IV) hypophosphito adducts and compounds

Abstract New tin(IV) hypophosphito derivatives and adducts were synthesized; discrete and infinite chain structures are suggested on the basis of infrared spectra, H 2 PO 2 − acting as a bridged bidentate; H 2 PO 2 − turns into HPO 3 2− while reacting with SnBu 3 Cl.

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.

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.

Reassignment of the infrared spectra of SnPh3Cl. An infrared method to characterize SnPh3Cl 1—1 adducts

Abstract The stretching vibrations of the SnC3Cl group in the infrared spectrum of SnPh3Cl have been reassigned on the basis of an SnC3 group belonging to the C3ν point group which is replaced by D3h in SnPh3Cl2TMN (TMN = tetramethylammonium). The important shift (108 cm−1) of νsSnC3 from SnPh3Cl to SnPh3Cl2 TMN is due to a “C3ν point group inversion” (νsSnC3 is higher in frequency than νasSnC3 in the i.r. spectrum of SnPh3Cl).

(2-{[2-(2-Amino­ethyl­amino)­ethyl­imino]­meth­yl}phenolato-κ4O,N′,N′′,N′′′)copper(II) perchlorate

The asymmetric unit of the title complex, [Cu(C11H16N3O)]ClO4, consists of two CuII ions coordinated by Schiff base ligands and two perchlorate anions. The Schiff base molecules are linked to the CuII atoms via three N atoms and one O atom, resulting in a square-planar geometry. Intermolecular hydrogen bonds involving the NH groups as donors and O atoms of the perchlorate anions as acceptors are 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.