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Shedding light on the photoisomerization pathway of donor-acceptor Stenhouse adducts
Title Shedding light on the photoisomerization pathway of donor-acceptor Stenhouse adducts Author info Mariangela Di Donato, Michael M. Lerch ... [et al.] Author Di Donato Mariangela (15%)
Co-authors Lerch Michael M. (15%)
Lapini Andrea (5%)
Laurent Adéle D. (10%)
Iagatti Alessandro (5%)
Bussotti Laura (5%)
Ihrig Svante P. (5%)
Medveď Miroslav 1971- (10%) UMBFP08 - Katedra chémie
Jacquemin Denis (5%)
Szymański Wiktor (5%)
Buma Wybren Jan (10%)
Foggi Paolo (5%)
Feringa Ben L. (5%)
Source document Journal of the American Chemical Society. Vol. 139, no. 44 (2017), pp. 15596-15599. - Washington : The American Chemical Society, 2017 Keywords molekulové fotoprepínače - molecular photoswitches donorno-akceptorové Stenhousove adukty ultra-fast spectroscopy DFT metóda Language English Country United States of America systematics 54 Annotation Donor-acceptor Stenhouse adducts (DASAs) are negative photochromes that hold great promise for a variety of applications. Key to optimizing their switching properties is a detailed understanding of the photoswitching mechanism, which, as yet, is absent. Here we characterize the actinic step of DASA-photoswitching and its key intermediate, which was studied using a combination of ultrafast visible and IR pump-probe spectroscopies and TD-DFT calculations. Comparison of the time-resolved IR spectra with DFT computations allowed to unambiguously identify the structure of the intermediate, confirming that light absorption induces a sequential reaction path in which a Z-E photoisomerization of C-2-C-3 is followed by a rotation around C-3-C-4 and a subsequent thermal cyclization step. First and second-generation DASAs share a common photoisomerization mechanism in chlorinated solvents with notable differences in kinetics and lifetimes of the excited states. The photogenerated intermediate of URL Link na plný text Public work category ADC No. of Archival Copy 41477 Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ References PERIODIKÁ-Súborný záznam periodika 
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