Abstract
Azo calix[4]crowns 1-[2,2′] and 1-[4,4′] have been synthetized consisting in unsymmetrical 1,3-calix[4]- bis-crowns combining one polyether crown-6 and one azobenzene modified crown-6, O-attached at each side of a calix[4]arene in the 1,3-alternate conformation. Preliminary complexation of alkalis and ammonium picrates showed the cations to be located in the unmodified crown ether of the 1:1 complexes. Complexation induced changes in the trans cis ratio of the azobenzene unit of 1-[4,4′] by an allosteric mechanism probably due to conformational changes.
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