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Enhanced Electrochemiluminescence from a Stoichiometric Ruthenium(II)–Iridium(III) Complex Soft Salt
Author(s) -
Swanick Kalen N.,
Sandroni Martina,
Ding Zhifeng,
ZysmanColman Eli
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201406533
Subject(s) - electrochemiluminescence , iridium , ruthenium , excited state , salt (chemistry) , electrochemistry , photochemistry , luminescence , chemistry , infrared spectroscopy , materials science , electrode , catalysis , optoelectronics , physics , organic chemistry , atomic physics
Electrochemiluminescence (ECL) and electrochemistry are reported for a heterometallic soft salt, [Ru(dtbubpy) 3 ][Ir(ppy) 2 (CN) 2 ] 2 ( [Ir][Ru][Ir] ), consisting of a 2:1 ratio of complementary charged Ru and Ir complexes possessing two different emission colors. The [Ru] 2+ and [Ir] − moieties in the [Ir][Ru][Ir] greatly reduce the energy required to produce ECL. Though ECL intensity in the annihilation path was enhanced 18× relative to that of [Ru(bpy) 3 ] 2+ , ECL in the co‐reactant path with tri‐ n‐ propylamine was enhanced a further 4×. Spooling spectroscopy gives insight into ECL mechanisms: the unique light emission at 634 nm is due to the [Ru] 2+ * excited state and no [Ir] − * was generated in either route. Overall, the soft salt system is anticipated to be attractive and suitable for the development of efficient and low‐energy‐cost ECL detection systems.