INTERACTION OF 2-(2'-HYDROXY)PHENYLBENZOTHIAZOLINE WITH SOME METAL IONS: DETERMINATION OF ITS DISSOCIATION CONSTANT IN AQUO-ORGANIC MEDIA

  • K. Laxmi Department of Chemistry, University College for Women, Osmania University, Koti, Hyderabad 500195, India
  • G. Bhargavi Department of Chemistry, University College for Women, Osmania University, Koti, Hyderabad 500195, India
  • B. Sireesha Department of Chemistry, University College for Women, Osmania University, Koti, Hyderabad 500195, India
  • Ch. Sarala Devi* Department of Chemistry, University College for Women, Osmania University, Koti, Hyderabad 500195, India
Keywords: 2-(2'-Hydroxy)phenylbenzothiazoline, Metal complexes, Potentiometric titrations, Dissociation constant, bis benzylidene disulphide

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.
KEY WORDS: 2-(2'-Hydroxy)phenylbenzothiazoline, Metal complexes, Potentiometric titrations, Dissociation constant, bis benzylidene disulphide

Bull. Chem. Soc. Ethiop. 2006, 20(1), 161-166.
Published
2006-05-08
Section
Articles

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eISSN: 1726-801X
print ISSN: 1011-3924