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>Naphthalene linked pyridyl urea as a supramolecular gelator: a new insight into naked eye detection of I- in the gel state with semiconducting behaviour
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Naphthalene linked pyridyl urea as a supramolecular gelator: a new insight into naked eye detection of I- in the gel state with semiconducting behaviour
The gelation and anion responsive behavior of some 3-aminopyridine-based urea molecules 1-5 have been examined. Of the different pyridyl ureas, compounds 1 and 2 form an instant gel from DMSO/H2O and DMF/H2O solvents. Between the gels 1 and 2, only the gel state of 2 has been noted, for the first time, to detect iodide ions over a series of other anions through a colour change involving no phase transformation. Furthermore, the gel state of 2 is a poor semiconductor and the presence of iodide ions considerably enhances its conductivity that varies with temperature.
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