Synthesis and Optical Study of Sensitive and Selective Calix[4] Based Cu2+ Ion Detection Probes

Naked-eye colored chemo dosimeters based on symmetrical calix[4]azo dye conjugates A(1-3) 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.