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Issue 9, 2010
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What is the difference between the dynamics of anion- and keto-type of photochromic salicylaldehyde azine?

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Abstract

The normal and anion structures of salicylaldehyde azine (SAA) in solvents of different viscosities and polarities have been studied by means of femto- to nanosecond time-resolved emission techniques. In the normal form, an excited-state intramolecular proton-transfer (ESIPT) reaction takes place with a time constant shorter than 80 fs to produce an excited keto-type tautomer in which intramolecular-vibrational energy redistribution and vibrational cooling occur in 100 fs to 2 ps. The viscosity-dependent emission decay in the red part of the spectrum with 5–11 ps reflects a twisting motion leading to rotamers of these keto-type structures, most probably of (n,π*) nature. For the anion type, the viscosity dependent rise-times (3 to 400 ps) at the red part of the emission, and the wavelength-dependent fluorescence lifetimes (20 to 1100 ps) indicate a stepwise formation of different conformers of the anions. The results reported here should be relevant to a better understanding of the photobehaviour of photochromic compounds and charged chromophores in biological systems.

Graphical abstract: What is the difference between the dynamics of anion- and keto-type of photochromic salicylaldehyde azine?

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Article information


Submitted
06 Oct 2009
Accepted
10 Dec 2009
First published
15 Jan 2010

Phys. Chem. Chem. Phys., 2010,12, 2107-2115
Article type
Paper

What is the difference between the dynamics of anion- and keto-type of photochromic salicylaldehyde azine?

M. Ziółek, M. Gil, J. A. Organero and A. Douhal, Phys. Chem. Chem. Phys., 2010, 12, 2107
DOI: 10.1039/B920951D

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