Synthesis and spectrophotometric determination of acidity constants of 2,3,4,6'-tetrahydroxy-3'-sulfoazobenzene and their use in determination of aluminum

Authors

TUFAN GÜRAY
CEMİL ÖĞRETİR
TEVFİK GEDİKBEY
ABU ALİ HÜSEYİNLİ

DOI

10.3906/kim-0908-212

Abstract

A novel azo derivative, 2,3,4,6'-tetrahydroxy-3'-sulfoazobenzene (THSA), was synthesized by using pyrogallol. The acid dissociation constants, or K_a values, of THSA were determined by the UV-visible spectroscopic technique. The protonation and deprotonation behaviors of the title molecule were studied from the super basic to the super acid region (i.e. 10 N NaOH to 98% H_2SO_4), including the pH region. A selective and sensitive UV-visible spectrophotometric method was devised for determination of aluminum by using this ligand. The developed method was successfully applied to an alunite mineral and to pharmaceutical preparations for the determination of aluminum.

Keywords

Azo dye, acidity constants, aluminum, spectrophotometric determination

First Page

291

Last Page

305

Recommended Citation

GÜRAY, TUFAN; ÖĞRETİR, CEMİL; GEDİKBEY, TEVFİK; and HÜSEYİNLİ, ABU ALİ (2011) "Synthesis and spectrophotometric determination of acidity constants of 2,3,4,6'-tetrahydroxy-3'-sulfoazobenzene and their use in determination of aluminum," Turkish Journal of Chemistry: Vol. 35: No. 2, Article 12. https://doi.org/10.3906/kim-0908-212
Available at: https://journals.tubitak.gov.tr/chem/vol35/iss2/12