Synthesis and electrode properties of 19-membered azo- and azoxycrown ethers. Structure of dibenzo-19-azocrown-7

19-Membered azo- and azoxycrown ethers have been synthesized by reductive macrocyclization of respective bis-(nitrophenoxy)oxaalkanes. The behavior of these compounds as ionophores in ion-selective membrane electrodes has been studied. The structure of the 19-membered dibenzoazocrown ether has been determined.