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- W2050305450 abstract "The spectroscopy and dynamics of the azobenzene compound 4-(4′-aminophenylazo) benzoic acid sodium salt (APB) is described and its applicability as a reversible fast photoswitch for conformational control in small peptides is discussed. Addition. of an electron withdrawing (carboxy-) and an electron donating (amino-) group on the phenyl rings of azobenzene shifts the absorption maximum of the π-π∗ band of the resulting APB molecule from 320 to 420 nm. Reversible photoisomerization is detected by UV-vis, MR and NMR spectroscopy. Femtosecond time resolved ground and excited state dynamics were recorded, indicating that excited trans-APB reaches the electronic ground state within ≈ 1 ps. This ultrafast photoisomerization is followed by a wavelength dependent process in the 10 ps range which is interpreted as vibrational cooling of the product molecules. At delay times longer than 200 ps the absorption characteristics, as expected from the cw-difference spectrum, can be seen, indicating the completion of the photoprocess." @default.
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- W2050305450 date "1997-05-01" @default.
- W2050305450 modified "2023-10-18" @default.
- W2050305450 title "Ultrafast photoisomerization of azobenzene compounds" @default.
- W2050305450 cites W1996491487 @default.
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- W2050305450 doi "https://doi.org/10.1016/s1010-6030(96)04572-8" @default.
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