Synthesis of photo-switchable derivatives of p-tert-butyl thiacalix[4]arenes containing ethoxycarbonyl and 4-amidoazobenzene fragments in the lower rim substituents

Abstract

New p-tert-butyl thiacalix[4]arene derivatives containing simultaneously the 4-amidoazobenzene and ethoxycarbonyl fragments at the lower rim in cone and 1,3-alternate conformation of tri and tetrasubstituted derivatives, correspondingly, were synthesized. It was shown that the replacement of the hydroxyl group by ethoxycarbonyl fragment in a 1,3-disubstituted macrocycle with 4-amidoazobenzene groups leads to the binding of fluoride and chloride-anions. The substitution of two hydroxyl groups by ethoxycarbonyl fragments dramatically changed the binding properties of tetrasubstituted p-tert-butyl thiacalix[4]arene derivative. © ISUCT Publishing.