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Issue 37, 2013
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Water detection by “turn on” fluorescence of the quinone-containing complexes [Ru(phen)2(1,10-phenanthroline-5,6-dione)2+] and [Ru(phenanthroline-5,6-dione)3]2+

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Abstract

Addition of water to the quinone functions in [Ru(phen)2(pdn)]2+ (1) and [Ru(pdn)3]2+ (2) (where phen = 1,10-phenanthroline and pdn = 1,10-phenanthroline-5,6-dione) turns on fluorescence at 605 nm, as formation of the geminal diol eliminates the predominant quinone-based non-radiative decay pathway and gives rise to a long-lived 3MLCT state similar in nature to that seen in [Ru(phen)3]2+. Using NMR, the equilibrium constant for the hydration reaction of 1 in acetonitrile was determined to be 0.0253. From this data and experimental fitting of the luminescent titration data, the equilibrium constant for 2 of 1.62 × 10−5 and emission yields for hydrated 1 and 2 were determined. Interestingly, all three quinone functions must be hydrated in 2 for luminescence, which is why the equilibrium constants vary so much. The ‘turn on’ luminescence allows for a very sensitive detection of water in aprotic solvents such as acetonitrile.

Graphical abstract: Water detection by “turn on” fluorescence of the quinone-containing complexes [Ru(phen)2(1,10-phenanthroline-5,6-dione)2+] and [Ru(phenanthroline-5,6-dione)3]2+

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Publication details

The article was received on 21 Jun 2013, accepted on 30 Jul 2013, published on 01 Aug 2013 and first published online on 01 Aug 2013


Article type: Communication
DOI: 10.1039/C3DT51664D
Citation: Dalton Trans., 2013,42, 13305-13307
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    Water detection by “turn on” fluorescence of the quinone-containing complexes [Ru(phen)2(1,10-phenanthroline-5,6-dione)2+] and [Ru(phenanthroline-5,6-dione)3]2+

    S. A. Poteet and F. M. MacDonnell, Dalton Trans., 2013, 42, 13305
    DOI: 10.1039/C3DT51664D

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