Two novel heteroatom-bridged his （benzo-12-crown-4 ether）s, i.e. his [2-nitro-4,5 （1,4,7,10-tetraoxadecamethylene） disulfide 1 and diselenide 2, have been synthesized. X ray crystallographic structure was obtained for 1. Ion selective electrodes （ISE） for Ag+, containing 1 and 2 in PVC membrane as neutral carriers, were prepared, and their selectivity coefficients for Ag+ (KAg.Mpot) were determined against other heavy metal ions, alkali and alkaline-earth metal ions. and ammonium ion. These ISEs showed excellent Ag+ selectivities, log KAg.Mpot ≤ -3.8, against most of the interfering canons examined, except for Hg+.
