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Fifteen bisquinoline derivatives with a thioether linker have been prepared, and their Hg2+‐ and Fe3+‐specific fluorescence responses have been investigated. Upon the addition of Hg2+ ions, unsubstituted 2‐quinolylmethyl derivatives 1a–1c exhibit a fluorescence enhancement (off–on) response. On the other hand, ratiometric and fluorescence quenching (on–off) responses are accomplished for derivatives...
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