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Look who's talking: Redox-induced chemical communication between surface-confined osmium(II) and ruthenium(III) polypyridyl complexes in organic solvents has been demonstrated. Fe2+ was used as electron carrier (see picture), and the output signal of the monolayer reporter system was read optically with a conventional UV/Vis spectrophotometer in the transmission mode. Electron transfer takes place at surface–solution interfaces.
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Gupta et al. (2008) studied this question.
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