First evidence of thermo- and two-step photochromism of tris-anils

Safin, Damir A.;Garcia, Yann
(2013) RSC Advances — Vol. 3, n° 18, p. 6466 (2013)

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Abstract
Seven N,N9,N99-tris(salicylidene)triamines of common formula N(CH2CH2NLCH–aryl) [aryl = 2-OH-C6H4 (1), 2-OH-(5-Cl)C6H3 (2), 2-OH-(5-Br)C6H3 (3), 2,5-(OH)2C6H3 (4), 2,4-(OH)2C6H3 (5), 2,3,4-(OH)3C6H2 (6) and 2-OH-C10H6 (7)] have been synthesized and characterized by elemental analysis, X-ray powder diffraction, NMR, diffuse reflectance, Raman and fluorescence spectroscopy. All the tris-anils are thermochromic. 4 exclusively displays photochromism upon irradiation at 365 nm with a unique two-step back thermal relaxation, with kinetic constants kI = 1.061025 s21 and kII = 4.061025 s21 for the first and second steps, respectively. The origin of the observed photochromism is due to a cis/trans-keto isomerization.
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Safin, D. A., & Garcia, Y. (2013). First evidence of thermo- and two-step photochromism of tris-anils. RSC Advances, 3(18), 6466. https://doi.org/10.1039/c3ra40705e (Original work published 2013)