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Rhodamine-Appended Bipyridine: XOR and OR Logic Operations Integrated in an Example of Controlled Metal Migration
Cristina Núñez1, Sergio M Santos2, Elisabete Oliveira3
1BIOSCOPE Group, REQUIMTE, Chemistry Department, Faculty of Science and Technology, University NOVA of Lisbon 2829-516 Caparica (Portugal) E-mail: cle@fct.unl.pt cristina.nunez@fct.unl.pt ; Inorganic Chemistry Department, Faculty of Chemistry, University of Santiago de Compostela 15782 Santiago de Compostela (Spain) ; Ecology Research Group, Department of Geographical & Life Sciences, Canterbury Christ Church University CT1 1QU, Canterbury (UK) ; PROTEOMASS Scientific Society, Madan Parque Rua dos Inventores, 2825-182 Caparica (Portugal).
Abstract:
A new bipyridyl derivative 1 bearing rhodamine B as visible fluorophore was designed, synthesized and characterized as a fluorescent and colorimetric sensor for metal ions. Interaction with Cu(2+), Zn(2+), Cd(2+), Hg(+), and Hg(2+) 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(2+), Zn(2+), and Hg(2+)) and "off-on" (Hg(+) and Cd(2+)) systems were obtained. Probe 1 was explored to mimic XOR and OR logic operations for the simultaneous detection of Hg(+)-Cu(2+) and Hg(+)-Zn(2+) pairs, respectively. DFT calculations were also performed to gain insight into the lowest-energy gas-phase conformation of free receptor 1 as well as the atomistic details of the coordination modes of the various metal ions.
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