Abstract
Naked-eye colored chemo dosimeters based on symmetrical calix[4]azo dye conjugates A1–3 are synthesized and characterized. Calix[4]azo dye conjugates exhibit high selectivity and sensitivity in detection of Fe2+, Ni2+, Co2+, and Cr3+ ions, and the highest sensitivity is determined for Cu2+. For the rapid monitoring of Cu2+ ions a simple paper test strip system is developed.
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