Studies on the Coordination Behaviour of the Schiff-Bases Derived from Some Sulpha-Drugs and Substituted 2-Hydroxyacetophenones

Department of Chemistry, D. N. College, Meerut-250 002

Department of Chemistry, Atara (P. G.) College, Atara (Banda)

Manuscript received 7 April 1980, accepted 5 November 1980

Schiff-bases derived from sulphafurazole sulphamethoxy-pyridazine and sulpha­phenazole and 2-hydroxy-5-methylacetophenone and 2-hydroxy-5-chloroacetophenone were synthesized. The complexes of the Schiff-bases with Mn(II), Fe(Il), Co(II), Ni(II) and Cu(II) were prepared and characterised by elemental analysis, magnetic moment, infrared and electronic spectral studies. These studies suggest the square-planar structure for Cu(II) complexes and tetrahedral structure for rest of the metal ions complexes. The stepwise stability constants of Mn(II), Co(Il), Cu(II) and Zn(II) were also calculated by Irving and Rossotti's method in 25% (v/v) dioxane­water medium at an ionic strength 0.1 M (NaClO₄) and 27\( \pm\)0.2°. The order of stability constant of these metal ions is in agreement with the order given by Irving and William. Thermodynamic stabilization energy was also calculated by George McClure's method.