Due to their potentially useful chemical properties and their applications, heterocyclic-based calixarenes such as, 1, 1 2, 2 3, 3 4 4 and 5, 5 have gained considerable attention recently from many research groups. These heterocycle-based calixarenes (Fig. 1), respectively, incorporate pyridine, furan, thiophene, indole or pyrrole units instead of the conventional phenolic units in the construction of the macrocyclic compound. ... As part of our on-going studies ...