Journal
COORDINATION CHEMISTRY REVIEWS
Volume 250, Issue 3-4, Pages 273-299Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ccr.2005.04.022
Keywords
molecular devices; fluorescence switches; scorpionates; helicates; ion translocation
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Multicomponent systems have been designed, which are able to perform defined functions related to light emission and quenching. The desired function can be switched ON/OFF by the operator through a chemical input, either a change of pH or a variation of the redox potential. Transition metals (e.g. Ni-II, Cu-II) are key constituents within the considered systems, playing a distinctive architectural role and favouring electron transfer processes. Investigated devices include static molecular switches, in which fluorescence can be quenched/restored through an acid-base or an oxidation-reduction reaction directly involving the metal centre, and dynamic switches, in which changes of the light emission intensity follow mechanical motions of the ligating framework. Motions include the oscillation of the pendant ann in scorpionate complexes, the metal ion translocation in a ditopic ligand and the assembling-disassembling of helicates. (c) 2005 Elsevier B.V. All rights reserved.
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