Protonation constants of some N-substituted thiophene-2-carboxamidoximes


Akay M. A., Durust N., Durust Y., Kilic E.

ANALYTICA CHIMICA ACTA, vol.392, no.2-3, pp.343-346, 1999 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 392 Issue: 2-3
  • Publication Date: 1999
  • Doi Number: 10.1016/s0003-2670(99)00220-2
  • Journal Name: ANALYTICA CHIMICA ACTA
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.343-346
  • Keywords: protonation constants, potentiometric titration, thiophene, carboxamidoximes, basicity, ethanol-water mixture, BOND-DISSOCIATION ENERGIES, ACIDITIES, AMIDOXIMES
  • Ankara University Affiliated: Yes

Abstract

The stoichiometric protonation constants of some N-substituted thiophene-2-carboxamidoximes have been determined in 50% ethanol-water mixture (v/v) at ionic strength of 0.1 M NaClO4 and at 25 degrees C A potentiometric titration method was used and calculation was done by using recently developed software. Variations of the protonation constant of these compounds were discussed in view of structural effects exerted on amino nitrogen and thiophenyl moiety by the substituents. (C) 1999 Elsevier Science B.V. All rights reserved.