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Cholesterol–based Bisamides on Biphenyl Backbone: A Case of Selective Visual Sensing of F − and H 2 PO 4 − through Breaking and Making of Gels
Author(s) -
Ghosh Kumaresh,
Panja Santanu
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201600238
Subject(s) - biphenyl , pyridinium , chemistry , solvent , silica gel , chloride , ion , hexane , salt (chemistry) , medicinal chemistry , nuclear chemistry , chromatography , organic chemistry
Cholesterol linked bisamides 1–3 on biphenyl spacers have been designed and synthesized. Compound 1 forms gel in CHCl 3 – 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 CHCl 3 in presence of H 2 PO 4 − , compound 3 formed gel in DMSO: H 2 O (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 H 2 PO 4 − and F − anions and validated their visual sensing.