Synthesis of new bis-calix[4]arenes with imine linkages. A search for new silver-selective sensors

We synthesized a series of new bis-calix[4]arenes with imine units in high yields by using a simple condensation procedure, and two of these bis-calix[4]arenes were tested as sensors in solid-state electrodes. High selectivity for Ag+, even over that of Hg2+, and excellent electrode properties were found.