Carmen M. Sharaby

Studies of Some New Cyclodiphosphazane Complexes of Fe(III), Fe(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II)

Novel hexachlorocyclodiphos(V)phazanes of sulfametrole, N′‐(4‐methoxy‐1,2,5‐thiadiazole‐3‐yl)sulfanilamide, and sulfadimidine, N′‐(4,6‐dimethyl‐2‐pyrimidyl)sulfanilamide, were prepared and their coordinating behavior towards the transition metal ions Fe(III), Fe(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) was studied. The structures of the isolated products are proposed based on elemental analyses, IR, UV, 1H NMR, mass spectra, reflectance, magnetic susceptibility measurements and thermogravimetric analysis (TGA). The hyperfine interactions in the isolated complex compounds were studied using 14.4 KeV γ‐ray from radioactive 57Co (Mössbauer spectroscopy). The data show that the ligands are coordinated to the metal ions in an octahedral manner. Most of the prepared compounds showed high bactericidal activity and, in some cases, the complexes have higher bactericidal activity than the ligands.

Reactions and spectroscopic studies of Group 6 metal carbonyls with pyrazinecarboxamide and certain phosphine ligands

Substitution reactions of phosphine ligands, triphenylphosphine (PPh3), tri(m-chlorophenyl)phosphine (m-ClPPh3), tri(p-methoxyphenyl)phosphine (p-MeOPPh3) and tri(benzyl)phosphine (PBz3) with [M(CO)4(PCA)] (M = Cr, Mo and W, PCA = pyrazinecarboxamide) were found to be dependent on the type of metal and phosphine ligand. The complexes were characterized by elemental analysis, mass spectrometry, and IR and 1H NMR spectroscopy. UV–vis spectra of the complexes in different solvents showed bands due to metal-to-ligand charge transfer.