PROTONATION CONSTANTS OF SOME SUBSTITUTED SALICYLIDENEANILINES IN DIOXAN-WATER MIXTURES

GUNDUZ T., KILIC E., CANEL E., KOSEOGLU F.

ANALYTICA CHIMICA ACTA, cilt.282, sa.3, ss.489-495, 1993 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 282 Sayı: 3
  • Basım Tarihi: 1993
  • Doi Numarası: 10.1016/0003-2670(93)80112-x
  • Dergi Adı: ANALYTICA CHIMICA ACTA
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.489-495
  • Anahtar Kelimeler: POTENTIOMETRY, TITRIMETRY, PROTONATION CONSTANTS, SCHIFFS BASES
  • Gazi Üniversitesi Adresli: Hayır

Özet

Sixteen Schiff's bases have been prepared from salicylaldehyde and substituted anilines and their stoichiometric protonation constants have been determined in dioxan-water mixtures of 30, 40, 50 and 60% dioxan (v/v) using a combined pH electrode at 25 degrees C, under nitrogen atmosphere. The calculation of the constants has been carried out using a PKAS computer programme. The effects of the substituents on the protonation constants and the additivities of these effects are discussed. Furthermore, it was found that the log K-OH value increases but the log K-NH value decreases for all Schiff's bases if the percentage of dioxan is increased.