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Fluoride-responsive hydrogel of cholesterol appended pyridinium urea and its metal detecting ability and semi-conducting behaviour

Cholesterol appended pyridinium urea 1 acts as low molecular weight gelator in DMSO:H2O (1:1, v/v) showing distinct colour change in the presence of aqueous solution of KF as well as tetrabutylammonium fluoride and recognises F− specifically. In addition, this hydrogel is noted to detect aqueous solution of Cu2+ and Pb2+ ions over a series of other metal ions and exhibits good semi-conducting property.