Potentiometric and spectroscopic determination of acid dissociation constants of some phenols and salicylic acids


Aydin R. , Ozer U., Turkel N.

TURKISH JOURNAL OF CHEMISTRY, vol.21, no.4, pp.428-436, 1997 (Journal Indexed in SCI) identifier

  • Publication Type: Article / Article
  • Volume: 21 Issue: 4
  • Publication Date: 1997
  • Title of Journal : TURKISH JOURNAL OF CHEMISTRY
  • Page Numbers: pp.428-436

Abstract

The dissociation constant of the catechol derivatives 4-nitrocatechol (NCAT), 2,3-dihydroxybenzoic acid (2,3-DHBA), 3,4-dihydroxybenzoic acid (3,4-DBHA), 3,4-dihydroxyhenylacetic acid (3,4-DPHA) and 3,4-dihydroxycinnamic acid (3,4-DHCA) were identified in 0.1M NaClO4 ionic medium, at t=25 degrees C, by potentiometry. In addition, the first and second dissociation constants of the salicylic acid derivatives 5-nitrosalicylic acid (5-NSA), 4-hydroxysalicylic acid (4-HSA) 5-nitrosalicylic acid (5-HSA) were also determined by potentiometry. Furthermore, the second acid dissociation constants of these ligands were evaluated in I=0.1M NaClO4 ionic medium, at a temperature of 25 degrees C by computer analysis of spectroscopic data.