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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 pK a corresponding to the hydroxyl group. The pK a 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. KEY WORDS : 2-(2'-Hydroxy)phenylbenzothiazoline, Metal complexes, Potentiometric titrations, Dissociation constant, bis benzylidene disulphide Bull. Chem. Soc. Ethiop. 2006 , 20(1), 161-166.

bulletin of the chemical society of ethiopia

&lt;b&gt;INTERACTION OF 2-(2'-HYDROXY)PHENYLBENZOTHIAZOLINE WITH SOME METAL IONS: DETERMINATION OF ITS DISSOCIATION CONSTANT IN AQUO-ORGANIC MEDIA&lt;/b&gt;