<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Rationalization of excited-state tuning\r\nthrough ultrafast transient absorption and\r\nvibrational coherence spectroscopy"^^ . "Photophysical and-chemical processes make use of light as strongly quantized energy source,\r\nrendering mechanisms possible, which involve excited states that are thermally unavailable.\r\nThis puts them at the heart of many exciting and promising technologies from photovoltaics to\r\nphotocatalysis and photodynamic therapy. In this work, several strategies to tuning these\r\nexcited states are rationalized by ultrafast transient absorption and impulsive vibrational\r\nspectroscopy, applied to two different classes of samples. Firstly, the excited-state dynamics\r\nof two iron(II) complexes are investigated for the tuning effect of solvent choice and ligand\r\ndesign. They toggle on and off the involvement of metal-centered (MC) excited states acting\r\nas loss channels for desired metal-to-ligand charge transfer (MLCT) states. Impulsive\r\nvibrational spectroscopy is established as suitable method for identifying MLCT-MC\r\ntransitions in [Fe(bpy)(CN)4]2-, a well-known reference sample. The method is then applied to\r\nan iron(II)N-heterocyclic carbene complex and identifies an ultrafast MLCT-MC branching in\r\nthis promising dye-sensitizer candidate. Secondly, the photophysics and -chemistry of\r\ntriphenylamine is thoroughly investigated for the influences of solvent, the oxygen content\r\ntherein and enforced planarity. In n-hexane, triphenylamine is converted to N-phenylcarbazole,\r\nwith oxygen playing an intricate double role. The conversion is stopped completely by\r\nplanarization due to the cancellation of p-orbital preorientation. In chloroform, ultrafast\r\nelectron transfer to the solvent dominates the photochemistry, producing the radical cation\r\nleading to chromophore dimerization."^^ . "2023" . . . . . . . "Felix"^^ . "Hainer"^^ . "Felix Hainer"^^ . . . . . . "Rationalization of excited-state tuning\r\nthrough ultrafast transient absorption and\r\nvibrational coherence spectroscopy (PDF)"^^ . . . "Diss_FH_complete_PDF-A_affidative.pdf"^^ . . . "Rationalization of excited-state tuning\r\nthrough ultrafast transient absorption and\r\nvibrational coherence spectroscopy (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Rationalization of excited-state tuning\r\nthrough ultrafast transient absorption and\r\nvibrational coherence spectroscopy (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Rationalization of excited-state tuning\r\nthrough ultrafast transient absorption and\r\nvibrational coherence spectroscopy (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Rationalization of excited-state tuning\r\nthrough ultrafast transient absorption and\r\nvibrational coherence spectroscopy (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Rationalization of excited-state tuning\r\nthrough ultrafast transient absorption and\r\nvibrational coherence spectroscopy (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #33675 \n\nRationalization of excited-state tuning \nthrough ultrafast transient absorption and \nvibrational coherence spectroscopy\n\n" . "text/html" . . . "540 Chemie"@de . "540 Chemistry and allied sciences"@en . .