Determination of pKa Values of Some Phthalocyanines in Non –
Aqueous Dipolar Aprotic (Protofilic) Solvents
Fatih Islamoglu*, Selami Sasmaz, Ismail Aksu and Cihan Kantar
Department of Chemistry, Faculty of Sciences and Arts, Rize
University, Rize 53100, Turkey.
Some phthalocyanines were titrated with tetrabutylammonium
hydroxide (TBAH) in non-aqueous dipolar aprotic (protofilic (N,N
- dimethylformamide and DMSO)) solvents, using
potentiometric method. The half neutralization
potential values and the corresponding pKa values were
determined for all cases. The half neutralization
potential values were determined between -465.8±1.3 and
-494.3±1.4. pKa values were determined between 14.87±0.11 and
15.34±0.07 in N,N - dimethylformamide and DMSO media.
KEYWORDS: Phthalocyanines, tetrabutylammonium hydroxide,