Reference of 162318-34-5, Chemistry is the experimental science by definition. We want to make observations to prove hypothesis. For this purpose, we perform experiments in the lab. 162318-34-5, Name is 5-Ethynyl-2,2′-bipyridine,introducing its new discovery.
Two iridium(III) complexes displaying for one a high HOMO-LUMO gap and for the other a weaker gap were linked in a controlled and logical manner to closo-p-carborane spacers. The bridging ligand is composed of 5-ethynyl-2,2?-bipyridine units, and the peripherical Ir-ligands are orthometalated 2?,4?-difluoro-2-phenylpyridine (dfppy) (lambdaabs at 400 nm for the “Ir(dfppy)2(bpy? )”) for the energy donor fragment and dibenzo[a,c]phenazine (dbpz) (lambdaabs at 525 nm for “Ir(dbpz)2(bpy?) “) for the energy acceptor fragment.Redox, spectroscopic, and photophysical properties for models and the donor-carborane-acceptor complex were determined. Efficient energy transfer from the “Ir(dfppy)2(bpy?) ” moiety to the “Ir(dbpz)2(bpy?)” fragment is occurring with a rate constant of 3.3 × 108 s-1 despite weak electronic coupling through the inert p-carborane spacer. From flash photolysis experiments it is shown that, by excitation of the donor, a low lying triplet state localized on the acceptor bridging ligand side is formed which decays by conversion to the 3MLCT of the acceptor fragment which phosphoresces at 644 nm.
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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI