Naslov
Schiff Bases Derived from Aminopyridines as Spectroflourimetric Analytical Reagents

Autori
Cimerman, Zvjezdana ; Miljanić, Snežana ; Galić, Nives

Izvornik
Croatica Chemica Acta (0011-1643) 73 (2000); 81-95

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
aminopyridines; Cu2+; quantum efficiency; salicylaldehyde; Schiff bases; spectroflourimetric reagent
(aminopyridines; Cu2+; quantum efficiency; salicylaldehyde; Schiff)

Sažetak
Fluorescence characteristics of Schiff bases derived from aminopyridines and salicylaldehyde were studied and possibilities of their analytical application were discussed. It is shown that these compounds can be used for spectrofluorimetric monitoring of small pH changes as well as for sensitive metal ion determinations. As an illustration of metal ion determination, a spectrofluorimetric procedure for analysis of Cu2+ is presented. Determination of Cu2+ was based on the quenching effect of Cu2+ on the fluorescence of N, N'-bis(salicylidene)-2, 3-pyridinediamine in dioxan/water 1/1 (volume fraction of dioxan, phi = 50%). Under optimal conditions (pH = 8.9, lambda(ex) = 340 nm, lambda(em) = 385 nm, c(ligand) = 1.0 x 10(-5) M), the linearity range of the calibration curve was 30-350 mu g L-1 Cu2+. The procedure is fast, simple and reproducible. It is characterized by high sensitivity and satisfactory selectivity. An additional advantage of Schiff bases derived from aminopyridines as analytical reagents lies in the simplicity of preparation procedures, enabling improvement of the determination methods not only by optimization of experimental conditions, but also by designing suitable structural characteristics of the reagent.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA