A dual-responsive macrocycle based on glycyrrhetinic acid
摘要:
A glycyrrhetinic acid-based macrocycle was synthesized using CuAAC 'click chemistry' and it showed remarkable selectivity and affinity for F- ions, as well as He ions. During the dual-responsive recognition process, 1,2,3-triazole ring, carbonyl group, and glycyrrhetinic acid rigid skeleton play the significant roles in the ion binding. (C) 2012 Elsevier Ltd. All rights reserved.
A newly designed stiff-stilbene functionalized biscalix[4]arene in its cis form Z-1 could be near-quantitatively photoswitched to the trans-isomer E-1 under irradiation of 385 nm UV light. The trans-biscalix[4]arene E-1 was found to be a supergelator in nonpolar organic solvents, e.g., cyclohexane, hexane, pentane, and ether, with critical gelation concentrations as low as 0.2, 0.5, 0.5, and 0.4% w/v