التفاصيل البيبلوغرافية
| العنوان: |
Investigation of ultrafast photoinduced processes for salicylidene aniline in solution and gas phase: toward a general photo-dynamical schemeElectronic supplementary information (ESI) available: Spectrum of the twisted enol for SAOMe and ultrafast time-resolved experiments for SAOH after 390 nm excitation. See DOI: 10.1039/b9pp00207c |
| المؤلفون: |
Michel Sliwa, Nicolas Mouton, Cyril Ruckebusch, Lionel Poisson, Abdenacer Idrissi, Stéphane Aloïse, Ludovic Potier, Julien Dubois, Olivier Poizat, Guy Buntinx |
| المصدر: |
Photochemical & Photobiological Sciences; May2010, Vol. 9 Issue 5, p661-669, 9p |
| مصطلحات موضوعية: |
ANILINE, SOLUTION (Chemistry), ENOLS, OPTICAL spectroscopy, WAVELENGTHS, PROTON transfer reactions, ISOMERIZATION, MULTIVARIATE analysis |
| مستخلص: |
Photodynamics of 2-hydroxybenzylideneaniline (photochromic salicylidene aniline SAOH) and N-(2-methoxybenzylidene)aniline (SAOMe) are studied by steady state and transient optical spectroscopy in solution and gas phase at different excitation wavelengths (266, 355 and 390 nm). Two competitive processes are observed from the enol* excited state: on one hand a rotation to get a twisted-enol, and on the other hand an excited state intramolecular proton transfer (ESIPT) followed by a cis–transisomerisation to get the trans-keto photochromic product. For the first time both processes are characterized at an ultrashort time scale for salicylidene aniline. Resolution of the spectrokinetic data is achieved by multivariate curve resolution and attribution of the intermediate species recovered is performed in comparison with the results obtained for SAOMe, which can only undergo enol rotational isomerisation. It shows that ESIPT and rotation to the twisted-enol for SAOH occur within 100 fs, as predicted by recent quantum dynamical simulations, with an efficiency ratio dependent on the excitation wavelength. Therefore a general photoinduced mechanism for salicylidene aniline is drawn. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
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