2d Coordination Polymers Based on the Interaction between Cucurbit[5]Uril and Light Lanthanide Metal Ions in the Presence of Copper Salts, and Use for the Detection of Nitrogenous Bases

Abstract

The coordination of cucurbit[5]uril (Q[5]) with lanthanide cations (Ln3+), in the presence of Cu2+ cations, led to the formation of 2D-network coordination polymers, which have been investigated using single crystal X-ray diffraction. Experimental results revealed that crystals were only readily affordable for the systems involving the lighter lanthanide cations (La3+, Ce3+, Pr3+, Sm3+, Eu3+ and Tb3+), with all six Ln3+-Q[5] complexes (1 ~ 6) exhibiting similar coordination mode at the cucurbit[5]uril (Q[5]), and forming 2D-network coordination polymers with a 2D supramolecular assembly. One complex was found to detect Adenine (A) and Uracil (U) with high selectively.

Keywords: Cucurbit[5]uril, lanthanide cation, Copper Cation, 2D coordination polymers, nitrogenous bases