An-Najah Staff

The novel azoimine ligand, PhANHAN@C(COCH3)ANHPh(C„CH) (H2L), was synthesized and its molecular structure was determined by X-ray crystallography. Catalytic hydration of the terminal acetylene of H2L in the presence of RuCl33H2O in ethanol at reflux temperature yielded a ketone (L1 = PhAN@NAC(COCH3)@NAPh(COCH3) and an enol (L2 = PhAN@NAC(COCH3)@NAPhC(OH)@CH2) by Markovnikov addition of water. Two mixed-ligand ruthenium complexes having general formula, trans-[Ru(bpy)(Y)Cl2] (1–2) (where Y = L1 (1) and Y = L2 (2), bpy is 2.20 -bipyrdine) were achieved by the stepwise addition of equimolar amounts of (H2L) and bpy ligands to RuCl33H2O in absolute ethanol. Theses complexes were characterized by elemental analyses and spectroscopic (IR, UV–Vis, and NMR (1D 1 H NMR, 13C NMR, (DEPT-135), (DEPT-90), 2D 1 H–1 H and 13C–1 H correlation (HMQC) spectroscopy)). The two complexes exhibit a quasi-reversible one electron Ru(II)/Ru(III) oxidation couple at 604 mV vs. ferrocene/ferrocenium (Cp2Fe0/+) couple along with one electron ligand reduction at 1010 mV. The crystal structure of complex 1 showed that the bidentate ligand L1 coordinates to Ru(II) by the azo- and imine-nitrogen donor atoms. The complex adopts a distorted trans octahedral coordination geometry of chloride ligands. The electronic spectra of 1 and 1+ in dichloromethane have been modeled by timedependent density functional theory (TD-DFT).

Sulfur nanoparticles (S-NPs) were prepared in this work by precipitation method using sodium thiosulphate and tetraoctylammonium bromide surfactants in conc. hydrochloric acid media. The sizes and shapes of S-NPs were confirmed by scanning electron microscope (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) techniques. Broth micro-dilution method was applied to determine antibacterial activity of S-NPs against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa reference strains. S-NPs exhibited antimicrobial activity (MIC = 5.47µg/ml) against Staphylococcus aureus strain (Gram-positive bacterium). On the other hand, no antimicrobial activity was detected against Gram-negative bacteria isolates (Escherichia coli and Pseudomonas aeruginosa) at 0.68 to 800 µg/ml.

Sulfur nanoparticles (S-NPs) were prepared in this work by precipitation method using sodium thiosulphate and tetraoctylammonium bromide surfactants in conc. hydrochloric acid media. The sizes and shapes of S-NPs were confirmed by scanning electron microscope (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) techniques. Broth micro-dilution method was applied to determine antibacterial activity of S-NPs against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa reference strains. S-NPs exhibited antimicrobial activity (MIC = 5.47µg/ml) against Staphylococcus aureus strain (Gram-positive bacterium). On the other hand, no antimicrobial activity was detected against Gram-negative bacteria isolates (Escherichia coli and Pseudomonas aeruginosa) at 0.68 to 800 µg/ml.

Sulfur nanoparticles (S-NPs) were prepared in this work by precipitation method using sodium thiosulphate and tetraoctylammonium bromide surfactants in conc. hydrochloric acid media. The sizes and shapes of S-NPs were confirmed by scanning electron microscope (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) techniques. Broth micro-dilution method was applied to determine antibacterial activity of S-NPs against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa reference strains. S-NPs exhibited antimicrobial activity (MIC = 5.47µg/ml) against Staphylococcus aureus strain (Gram-positive bacterium). On the other hand, no antimicrobial activity was detected against Gram-negative bacteria isolates (Escherichia coli and Pseudomonas aeruginosa) at 0.68 to 800 µg/ml.

Sulfur nanoparticles (S-NPs) were prepared in this work by precipitation method using sodium thiosulphate and tetraoctylammonium bromide surfactants in conc. hydrochloric acid media. The sizes and shapes of S-NPs were confirmed by scanning electron microscope (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) techniques. Broth micro-dilution method was applied to determine antibacterial activity of S-NPs against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa reference strains. S-NPs exhibited antimicrobial activity (MIC = 5.47µg/ml) against Staphylococcus aureus strain (Gram-positive bacterium). On the other hand, no antimicrobial activity was detected against Gram-negative bacteria isolates (Escherichia coli and Pseudomonas aeruginosa) at 0.68 to 800 µg/ml.

C14H8Cl2O, monoclinic, P21/c (no. 14), a = 7.4510(4) Å,b = 15.0430(7) Å, c = 10.5973(4) Å, b = 104.829(3)°,V = 1148.2 Å3, Z = 4, Rgt(F) = 0.0470, wRref(F2) = 0.1494,T = 296 K.

There are two independent molecules in the asymmetric unit
of the title compound, C12H9ClN2OS, a Schiff base derived
from hydrazide, in which the dihedral angles between the
thiophene and benzene rings are 3.6 (3) and 7.3 (3). In the
crystal, the two independent molecules are arranged about an
approximate non-crystallographic inversion center and are
connected by two N—H  O hydrogen bonds. Weak C—
H  Cl contacts are also present. Conversely, there are neither
significant aromatic stacking interactions nor contacts involving
S atoms.

Two tetrahedral mononuclear complexes with a general formula [CoX2(dmphen)](1-2) (where dmphen is 2,9-dimethyl 1,10-phenanthroline and 1 (X=Br), 2 (X=NCS)) have been synthesized. These complexes are characterized by elemental analysis, IR, UV-visible, TG/DTA and by X-ray diffraction.The calculated electrostatic potential surface of 2 has shown that the electrostatic potential values
around sulfur atom is anistropically distributed; the potential values along C-S bond is less negative -region of S atom. This agrees with the observed geometricalpthan the corresponding values in the .°arrangement of C-H…S-C hydrogen bonding interactions, the avg. of H…S-C angle is 81
Antimicrobial properties of cobalt (II) complexes was also assessed. Cobalt complexes exhibited significant antibacterial activity against different Gram negative and positive human pathogens. The absorption spectrum of these complexes in acetone was modeled by time-dependent density functional
theory (TD-DFT).