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Wiley Open Access, ChemistryOpen, 5(3), p. 190-198, 2014

DOI: 10.1002/open.201402020

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

Journal article published in 2014 by Cristina Núñez, Sergio M. Santos ORCID, Elisabete Oliveira, Hugo M. Santos ORCID, José Luis Capelo, Carlos Lodeiro ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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 Cu2+, Zn2+, Cd2+, Hg+, and Hg2+ 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” (Cu2+, Zn2+, and Hg2+) and “off-on” (Hg+ and Cd2+) systems were obtained. Probe 1 was explored to mimic XOR and OR logic operations for the simultaneous detection of Hg+–Cu2+ and Hg+–Zn2+ 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.