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The calix[4]resorcinarene macrocycles are excellent oligomers for the design of amphiphilic derivatives; they can form self-assemblies and stable sensing networks. Owing to their favorable properties, they are the focus of many exploitations and studies ranging from biological controls to heavy metal ion sensing. In this perspective, two calix[4]resorcinarene derivatives, namely: C-dec-9-en-1-ylcalix[4]resorcinarene (ionophore  I ) and C-undecylcalix[4]resorcinarene (ionophore  II ) were used to form stable ultra-thin Langmuir monolayer films at the air/water interface; their interactions with different harmful metal cations (Cd 2+ , Pb 2+ , Hg 2+ , and Cu 2+ ) were studied and highlighted via the pressure-area (Π-A) isotherms. The obtained results in the current investigation showed a dependence of both macrocycle interactions on the metal cation concentration in the subphase, confirming their complexation. In addition, the ionophore ( I ) exhibited high selectivity towards Pb 2+  and Cu 2+  cations, whereas the ionophore ( II ) showed tendency to bind with Cu 2+  cations over others, approving the potential applicability of these macrocycles as ion selective chemical sensors.

water, air and soil pollution/water, air and soil pollution

Application of the Langmuir Technique to Study the Response of C-dec-9-en-1-ylcalix[4]resorcinarene and C-undecylcalix[4]resorcinarene Ultra-thin Films' Interactions with Cd2+, Hg2+, Pb2+, and Cu2+ Cations Present in the Subphase