A thiacalix[4]arene based fluorescent chemosensor 3 of 1,3-alternate conformation bearing two dansyl groups and a crown-5 ring behaves as an "On-Off" reversible switch for two chemical inputs Hg(2+) and K(+) ions and mimics a molecular level keypad lock in the presence of F(-) ions.
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Kumar et al. (2009) studied this question.
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