Add time:09/01/2019         Source:sciencedirect.com

A macrocyclic bis-urea receptor (L1) and two acyclic bis-urea analogues (L2 and L3) have been synthesized. The crystal structure of L1 was obtained. The experimental results show that the receptor L1 has high selectivity to H2PO4−. Meanwhile, compared with the acyclic receptors L2 and L3, L1 has higher binding ability to H2PO4−. The results of density functional theory (DFT) calculations deepened our understanding on L1 conformations stability and its anion-binding property.

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