<b>Interaction of 2-(2’-hydroxy)phenylbenzothiazoline with some metal ions: determination of its dissociation constant in aquo-organic media</b>

Abstract

Potentiometric titrations were carried out with 2-(2'-hydroxy)phenyl benzothiazoline (HPBT) in various 50%v/v aquo-organic media (dioxan-water, acetone-water, methanol-water, and ethanol-water) and in different percentages of dioxan. The results indicated that the ligand is a monoprotic acid with pKa corresponding to the hydroxyl group. The pKa value of HPBT determined in various aquo-organic media followed the regular order of the reciprocal of dielectric constant. The solid metal complexes employing HPBT were synthesized and characterized. Spectral studies of these metal complexes [M(II) = Co, Ni, Cu and Zn] complexes indicated ring cleavage and formation of bis benzylidene disulphide (BBDS) during complex formation.

Keywords

• 2-(2'-Hydroxy)phenylbenzothiazoline
• Metal complexes
• Potentiometric titrations
• Dissociation constant
• bis benzylidene disulphide