Abstract
AbstractCholesterol linked bisamides 1–3 on biphenyl spacers have been designed and synthesized. Compound 1 forms gel in CHCl3 – n‐hexane (1:6, v/v) solvent and the gel is selectively collapsed into sol in presence of F− with a color change from yellowish white to greenish yellow. Presence of pyridinium amides in 2 and 3 showed different gelation behaviours. While the chloride salt 2 displayed gelation in CHCl3 in presence of H2PO4−, compound 3 formed gel in DMSO: H2O (1:2, v/v) without having any assistance of externally added anion. The gel derived from 3 underwent rapid gel to sol transition in presence of H2PO4− and F− anions and validated their visual sensing.
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