Potentiometric determination of stability constants of Lanthanon(III) complexes with some Schiff bases and benzothiazolines

Gurkan P., Sari N.

TALANTA, vol.44, no.11, pp.1935-1940, 1997 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 44 Issue: 11
  • Publication Date: 1997
  • Doi Number: 10.1016/s0039-9140(96)02058-9
  • Journal Name: TALANTA
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1935-1940
  • Keywords: benzothiazolines, Lanthanon(III) complexes, potentiometry, protonation constants, Schiff bases, stability constants, COORDINATION BEHAVIOR, SILICON(IV), NICKEL
  • Gazi University Affiliated: Yes

Abstract

The protonation constants of five Schiff base and two benzothiazoline type ligands and stability constants of their complexes with six lanthanide ions were determined by potentiometrically in ethanol-water solution (1:1, v/v) at 25 +/- 0.1 degrees C. The Schiff base-type ligands were salicylidene 2-iminopyridine (SAPy), salicylidene-5-methyl-2-iminopyridine (SAPyMe), salicylidene-5-chloro-2-iminopyridine (SAPyCl), 2-(2-pyridylmethyleneamino) phenol (PyOH), 2-(2-quinolylmethyleneamino) phenol (QuOH) and the benzothiazoline-type ligands were pyridine-2-carbozaldehydebenzothiazoline (PyS) and quinoline-2-carboxaldehydebenzothiazoline (QuS). The order of stability constants was found to be for metal ions La(III)