An ultrafast excited state intramolecular proton transfer (ESPIT) and photochromism of salicylideneaniline (SA) and its 'double' analogue salicylaldehyde azine (SAA). A controversial case

Autor:	Andrzej Maciejewski, Jacek Kubicki, Anna Grabowska, Ryszard Naskrecki, Marcin Ziółek
Rok vydání:	2004
Předmět:	Azine chemistry.chemical_compound Photochromism Schiff base chemistry Salicylaldehyde Excited state Ultrafast laser spectroscopy General Physics and Astronomy Molecule Physical and Theoretical Chemistry Photochemistry Ground state
Zdroj:	Phys. Chem. Chem. Phys.. 6:4682-4689
ISSN:	1463-9084 1463-9076
DOI:	10.1039/b406898j
Popis:	Two simple, structurally related photochromic Schiff bases, salicylideneaniline (SA) and salicylaldehyde azine (SAA) were studied in femto– and picosecond time domains. In both systems an ultrafast excited state intramolecular proton transfer (ESIPT) reaction was stated with the characteristic time below 50 fs. For SA this result is in contrast to the recent data published by Mitra and Tamai (S. Mitra and N. Tamai, Chem. Phys. Lett., 1998, 282, 391; S. Mitra and N. Tamai, Chem. Phys., 1999, 246, 463; S. Mitra and N. Tamai, Phys. Chem. Chem. Phys., 2003, 5, 4647), reporting on the corresponding time as long as 200–300 fs. The kinetics of decay of keto-tautomers in S1 states was followed by the transient absorption (410 nm and 470 nm for SA and SAA, respectively) and stimulated emission bands. About 10–30% of excited molecules give birth to the long-lived ground states of photochromic forms.
Databáze:	OpenAIRE
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