Premium
Near‐Infrared Electrochemiluminescence from Bistridentate Ruthenium(II) Di(quinoline‐8‐yl)pyridine Complexes in Aqueous Media
Author(s) -
Majuran Mayoorini,
ArmendarizVidales Georgina,
Carrara Serena,
Haghighatbin Mohammad A.,
Spiccia Leone,
Barnard Peter J.,
Deacon Glen B.,
Hogan Conor F.,
Tuck Kellie L.
Publication year - 2020
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201900637
Subject(s) - electrochemiluminescence , chemistry , quinoline , ruthenium , pyridine , photochemistry , photoluminescence , aqueous solution , electrochemistry , excited state , organic chemistry , catalysis , electrode , materials science , optoelectronics , physics , nuclear physics
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 ][PF 6 ] 2 by reaction with the dqp precursor using microwave irradiation. In both cases, photoluminescence spectra present strong 3 MLCT‐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 (Φ ECL ) 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.