Near‐Infrared Electrochemiluminescence from Bistridentate Ruthenium(II) Di(quinoline‐8‐yl)pyridine Complexes in Aqueous Media

We report the synthesis, photophysics, electrochemistry and electrochemiluminescence (ECL) of two dqp (dqp=2,6‐di(quinoline‐8‐yl)pyridine) based ruthenium(II) complexes, bearing either a n‐butyl ester (1) or the corresponding carboxylic acid functionality (2). The complexes were prepared from [Ru(dq...

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Published in:ChemPlusChem (Weinheim, Germany) Germany), 2020-02, Vol.85 (2), p.346-352
Main Authors: Majuran, Mayoorini, Armendariz‐Vidales, Georgina, Carrara, Serena, Haghighatbin, Mohammad A., Spiccia, Leone, Barnard, Peter J., Deacon, Glen B., Hogan, Conor F., Tuck, Kellie L.
Format: Article
Language:English
Subjects:
bistridendate ligands
electrochemiluminescence
near-infrared emission
photoluminescence
ruthenium(II)
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Summary:We report the synthesis, photophysics, electrochemistry and electrochemiluminescence (ECL) of two dqp (dqp=2,6‐di(quinoline‐8‐yl)pyridine) based ruthenium(II) complexes, bearing either a n‐butyl ester (1) or the corresponding carboxylic acid functionality (2). The complexes were prepared from [Ru(dqp)(MeCN)3][PF6]2 by reaction with the dqp precursor using microwave irradiation. In both cases, photoluminescence spectra present strong 3MLCT‐based red/near‐infrared (NIR) emissions centred at about 710 nm. The photoluminescence quantum yields were 6.1 % and 1.8 % for 1 and 2 respectively while the excited state lifetimes were 3.60 μs and 2.37 μs. Both complexes are ECL active, although ECL efficiency (ΦECL) of 1 was substantially higher than 2, due to its more favourable electrochemical properties. Importantly, 1 also gave strong ECL in aqueous media, which is rare for near‐infrared emitters. The results suggest the possibility of very interesting ECL sensing applications for this class of emitter in biological media. Also works in water: Two dqp (dqp=2,6‐di(quinoline‐8‐yl)pyridine) based ruthenium(II) complexes have strong 3MLCT‐based red/near‐infrared (NIR) emissions and are ECL active. The complex shown gave a strong ECL emission in aqueous media, which is rare for near‐infrared emitters and suggests very interesting ECL sensing applications for this class of emitter in biological media.
ISSN:2192-6506
2192-6506
DOI:10.1002/cplu.201900637