# A Potentiometric Investigation of Complex Formation between Some Metal Ions and Biologically Active Quinazoline-4-3(H)-one Schiff’s Base

Shivakumar, K and Shashidhar, S and Halli, MB (2007) A Potentiometric Investigation of Complex Formation between Some Metal Ions and Biologically Active Quinazoline-4-3(H)-one Schiff’s Base. In: Russian Journal of Physical Chemistry A, 81 (10). pp. 1681-1687.

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## Abstract

The proton dissociation constant of the ligand and the stability of the complexes of Co(II), Ni(II), Zn(II), Cd(II), Hg(II), Pb(II), Cu(II), Ba(II), Mg(II), Mn(II), Th(IV), and UO2(II) ions with 2-phenyl-3-(2'- hydroxy-5'-benzylidine)-quinazoline-4-(3H)-one [PBQ] were determined potentiometrically at $30 \pm 0.1 ^\circ C$ and ionic strengths of 0.025, 0.05, 0.10, 0.15 and 0.20 M $NaNO_3$ in a 60:40 (v/v) ethanol-water medium. The pro-ton–ligand and metal–ligand stability constants of the complexes were determined pH metrically by the Calvin–Bjerrum titration technique. The order of stability constants obeys the Irving–Rossotti rule. The negative values of $\Delta G ^ \circ$ suggest that the reactions are spontaneous.

Item Type: Journal Article Copyright of this article belongs to Pleiades. Division of Chemical Sciences > Materials Research Centre 13 Nov 2007 19 Sep 2010 04:41 http://eprints.iisc.ernet.in/id/eprint/12475