Rhodamine‐Appended Bipyridine: XOR and OR Logic Operations Integrated in an Example of Controlled Metal Migration

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<jats:title>Abstract</jats:title><jats:p>A new bipyridyl derivative <jats:bold>1</jats:bold> bearing rhodamine B as visible fluorophore was designed, synthesized and characterized as a fluorescent and colorimetric sensor for metal ions. Interaction with Cu<jats:sup>2+</jats:sup>, Zn<jats:sup>2+</jats:sup>, Cd<jats:sup>2+</jats:sup>, Hg<jats:sup>+</jats:sup>, and Hg<jats:sup>2+</jats:sup> ions was followed by UV/Vis and emission spectroscopy. Upon addition of these metal ions, different colorimetric and fluorescent responses were observed. “Off‐on‐off” (Cu<jats:sup>2+</jats:sup>, Zn<jats:sup>2+</jats:sup>, and Hg<jats:sup>2+</jats:sup>) and “off‐on” (Hg<jats:sup>+</jats:sup> and Cd<jats:sup>2+</jats:sup>) systems were obtained. Probe <jats:bold>1</jats:bold> was explored to mimic XOR and OR logic operations for the simultaneous detection of Hg<jats:sup>+</jats:sup>–Cu<jats:sup>2+</jats:sup> and Hg<jats:sup>+</jats:sup>–Zn<jats:sup>2+</jats:sup> pairs, respectively. DFT calculations were also performed to gain insight into the lowest‐energy gas‐phase conformation of free receptor <jats:bold>1</jats:bold> as well as the atomistic details of the coordination modes of the various metal ions.</jats:p>

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