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Antenna-Enhanced Triplet-State Emission of Individual Mononuclear Ruthenium(II)-Bis-terpyridine Complexes Reveals Their Heterogeneous Photophysical Properties in the Solid State
journal contribution
posted on 2016-09-15, 16:03 authored by Janning F. Herrmann, Paul S. Popp, Andreas Winter, Ulrich
S. Schubert, Christiane HöppenerThe ability of supramolecular transition
metal coordination complexes to form stabilized, long-living, radiative
charge-separated states has drawn interest to employ these triplet-state
emitters for the design of photonic devices. Their applicability as
photosensitizers of electron transfer in molecular photonic systems
is directly coupled to fundamental studies of their rich and highly
versatile photochemical and photophysical properties. Here, we demonstrate
that the properties of individual dual-luminescent Ru2+-bis-terpyridine complexes can be addressed with excellent sensitivity
in single-complex antenna-enhanced phosphorescence investigations.
This sensitivity enables studying environmentally imposed alterations
of their photophysical properties, e.g., in thin film applications.
In contrast to ensemble averaging investigations in solution, single-complex
antenna-enhanced phosphorescence investigations corroborate the existence
of Ru2+-bis-terpyridine complexes with spectrally shifted
emission peaks and diverging intrinsic quantum yields in the solid
state. Across the sample of investigated individual complexes the
observed emission spectra resemble the expected unique features of
this specific Ru2+-bis-terpyridine complex. The origin
of the shifted emission is discussed in terms of the existence of
different molecular conformers of this specific Ru2+-bis-terpyridine
complex facilitated by the embedment into a rigid solid matrix.
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supramolecular transition metal coordination complexesRuphotonicphotophysical propertiessensitivityemissionAntenna-Enhanced Triplet-State Emissionbis-terpyridine complexesradiative charge-separated statessingle-complex antenna-enhanced phosphorescence investigationsHeterogeneous Photophysical Properties
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