Iodine has long been paid considerable attention for its fascinating chemical behavior [1, 2] and biological essentiality. [3] The use of iodine as electrical conductor in the synthesis of donor-acceptor charge-transfer materials is well known. [4] In recent years, iodine in various forms has found applications in catalysis [5] as well as the creation of novel structures [6] and materials. [7] When covalently bound to an aromatic ring, iodine and other halogen atoms are versatile, assemblyorganizing factors that direct extended networks [8, 9] and induce helical aggregation of copper(ii) complexes. [9, 10] Furthermore, iodine is an essential element and plays an important role in the life processes of mammals and most vertebrates by forming the iodophenol moieties of thyroid hormones, growth hormones that function by binding to nuclear receptors. [11][12][13] The effect of the iodo substituent on these biological events has yet to be understood.
Cucurbituril (CB6) is a pumpkin-shaped macrocyclic compound synthesized by acid-catalyzed condensation of glycoluril and formaldehyde. [14] It is composed of six symmetrically arranged glycoluril units covalently linked by twelve methylene bridges to form a rigid, annular, hollow cavitand with two highly polar carbonyl openings.