Abstract
N-(9-anthrylmethyl)-1,4,7,10-tetraazacyclododecane (AC), as an homogeneous fluorescent chemo- sensor, was covalently grafted on a NaX zeolite modified with octadecyl group. This grafted zeolite (ZOAC) is highly dispersed in aqueous solution and hardly precipitates even after 10 min standing, because of the modification with the octadecyl group. Consequently, even though the ZOAC is employed for fluorescence measurement in heterogeneous system, the same high fluorescence intensity is obtained as that for AC employed in homogeneous system. The ZOAC demonstrates a good response toward pH and metal cations as also for AC. The metal cations coordinated on ZOAC are removed easily by washing with aqueous HCl solution and can be reused for further measurement. The stability of the AC group on ZOAC is significantly higher than that of AC under humid atmosphere, thus suggesting the potential utility of the ZOAC for practical sensing of pH and metal cations in aqueous solution.
