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pH-metric and spectroscopic properties of new 4 hydroxysalicylidene-2-aminopyrimidine Schiff-base transition metal complexes

Abd El-Fatah Ouf a, Mayada S. Ali a, Eman M. Saad b, Sahar I. Mostafa a
 

Abstract

 

The new complexes, cis-[WO2(Hsap)2], [Ru(PPh3)2(Hsap)2], Pd(Hsap)Cl(H2O)], [Pd(PPh3)2(Hsap)]Cl,[Ag(Hsap)(H2O)2], Ni(Hsap)(AcO)(H2O)2], [Ni(Hsap)2] and [Cu(Hsap)Cl(H2O)] are reported, where H2sap is 4-hydroxysalicylidene-2-amino pyrimidine Schiff-base. The complexes were characterized by elemental analyses, spectroscopic (IR, NMR, UV–vis, ESR and mass) and physical techniques (conductivity, magnetic and thermal measurements). The Schiff-base H2sap behaves as a bidentate chelate with the deprotonated 2-hydroxy and zomethine nitrogen centers with the pendant pyrimidine cyclic nitrogen functionality playing no role in coordination. The dissociation constants of H2sap and the stability constantsof the metal complexes have been determined pH-metrically at various temperatures, and the thermodynamic activation parameters (DS_, DG_, DH_) calculated






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