The cucurbit[n]uril (CB[n]s) macrocycles have been generating tremendous interest in the supramolecular chemistry since last three decades. CB[n]s are not only able to include different guests, but are also capable of coordinating to a wide range of metal ions. When the reader takes a deep look through this review; he will find full details of CB[n]s synthetizations, preparation procedures and detailed separation methods from each other, beside their physical proprieties, where; [n = 5,6,7,8 and 10]. Also, the reader will find more details and discussion of their ability to coordinate with wide range of the periodic table element cations including; alkali, alkali earth, transition metals, lanthanides and actinides as well. In which, a detailed discussion of their bowl-like capsules complexes, molecular capsules complexes, and simple based coordination polymers with the formation of some of their supramolecular frameworks through hydrogen bonding, ion-dipole interaction, it...it stacking, and outer surface interaction. Finally, multiple applications of these CB[n]-based coordination polymers and their supramolecular have been mentioned and discussed with various examples including; separation of different gases and elements, beside the elimination of other cations, and capturing of dyes and other similar applications.
