S. Shibata, M. Furukawa, K. Tǒei
Oct 1, 1973
Citations
0
Influential Citations
46
Citations
Journal
Analytica Chimica Acta
Abstract
Abstract Fifteen azo dyes containing the m-dimethylaminophenol group were synthesized, and their analytical potential for the determination of metals was studied spectrophotometrically. Among these reagents, the heterocyclic azo derivatives are most suitable as chromogenic reagents. The best reagents are the 2-pyridylazo compounds. These complexes with copper, zinc and nickel show molar absorptivities of the order of 100,000. For example, the 2-[2-(5-bromopyridyl)-azo]-5-dimethyl-aminophenol complexes with copper, zinc and nickel show molar absorptivities of 1.0, 1.33 and 1.28·105 1 mol-1 cm-1, respectively. In these reagents, the para-substituted dimethylamino group next to the azo group seems to play an important role in achieving high molar absorptivity and stability of the metal 'complexes.