Abstract
Macrocyclic ligands 1–3 can be used as colorimetric sensor for different anions following the displacement approach. The intense colour of the 4-nitrophenolate anion in MeCN solutions that disappears upon complexation with the ligands is reinstated after the addition of specific anions. The influence of both substituents in the biphenyl moiety and size of the cavity in sensing has been considered. X-ray diffraction studies of ligand 2 are also included.
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