Tuning the Electrochemiluminescence Color by Potential:
Design of a Series of Heterodinuclear Ir/Ru Labels
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Abstract
A series
of heterodinuclear complexes [(bpy)<sub>2</sub>Ru(bpy)(CH<sub>2</sub>)<i><sub>n</sub></i>(bpy)Ir(df-ppy)<sub>2</sub>]<sup>3+</sup> (<b>1</b>, where bpy is 2,2′-bipyridyl, df-ppy
is 2-(2,4-difluorophenyl)pyridine, and <i>n</i> = 10, 12,
14) have been designed and synthesized. Both red (from the Ru moiety)
and green (from the Ir moiety) electrochemiluminescence (ECL) can
be acquired simultaneously thorough alternation of the scanning potentials;
especially, a good linear calibration curve between the ECL intensity
ratio (<i>I</i><sub>Ru</sub>/<i>I</i><sub>Ir</sub>) and the scanning potential can be reached over a potential range
from 0.55 to 1.6 V. All of this provides a general methodology for
developing electrochemistry induced light-emitting devices and a ratiometric
ECL detection method
