Ni-catalysed diarylation of vinylpyridylsilanes with arylzinc reagents and aryl halides is reported by stabilizing Heck intermediates as pyridylsilyl-coordinated transient metallacycles.
Transient absorption data of [FeII(tpy)(CN)3]- reveals spectroscopic signatures indicative of 3MLCT with a ~10 ps kinetic component. These data are supported by DFT and TD-DFT calculations, which show that excited...
Photochromic molecules are examples
of light-activated bistable
molecules. We highlight the design criteria for a class of ruthenium
and osmium sulfoxide complexes that undergo phototriggered isomerization
of the bound sulfoxide. The mode of action in these complexes is an
excited-state isomerization of the sulfoxide from S-bonded to O-bonded.
We discuss the basic mechanism for this transformation and highlight
specific examples that demonstrate the effectiveness and efficiency
of the isomerization. We subsequently discuss future research directions
within the field of phototriggered sulfoxide isomerizations on transition
metal polypyridine complexes. These efforts involve new synthetic
directions, including the choice of metal as well as new ambidentate
ligands for isomerization.
We report the first instance of observing the phototriggered isomerization of dmso ligands on a bis sulfoxide complex, [Ru(bpy)2(dmso)2], in the crystalline solid state. The solid-state UV-vis spectrum of the...
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