Journal
INORGANIC CHEMISTRY
Volume 51, Issue 15, Pages 7957-7959Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ic301238e
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Funding
- National Science Foundation [CHE-1012487]
- Air Force Office of Scientific Research [FA9550-05-1-0276]
- BGSU Research Enhancement Initiative
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1012487] Funding Source: National Science Foundation
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Triplet state photophysics has been generated in two distinct diketopyrrolopyrrole (DPP) chromophores terminated with either phenyl (1) or thienyl (2) spacers, when sandwiched between two Ir(III) complexes using bipyridyl linkers. Upon coordination of the bpy-DPP-bpy subunit resulting in its planarization, the pi-conjugation in the DPP chromophore formally extends and was manifested as a substantial red shift in the absorption and fluorescence profiles of 1 and 2. Low energy excitation of these dinuclear metal complexes produced strongly quenched singlet fluorescence, generated quite intense long-lived (tau similar to 3 mu s) absorption transients in the red, sensitized O-1(2) photoluminescence centered at 1270 nm in aerated solutions, and yielded low temperature near-IR phosphorescence in 1 centered at 950 nm.
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