Issue 10, 2004
From the journal:

New Journal of Chemistry

Two coupled photochromic systems of 3′,4′-(methylenedioxy)flavylium: kinetic and thermodynamic characterization†

Damián Fernández,a   Filipe Folgosa,a   A. Jorge Parolaa  and  Fernando Pina*a  

* Corresponding authors

a REQUIMTE/CQFB, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Monte de Caparica, Portugal
E-mail: fjp@dq.fct.unl.pt

Abstract

The chemistry and photochemistry of 3′,4′-(methylenedioxy)flavylium was studied by means of UV–Vis spectrophotometry, 1H NMR, stopped flow, and continuous irradiation, in acidic and basic aqueous solutions. Six species were identified: the flavylium cation, AH+; the hemiketal, B; the cis- and the trans-chalcones, Cc and Ct, and their ionized forms, Cc− and Ct−. These species define a multiequilibria network whose kinetics and thermodynamics were completely characterized. The two pairs of chalcones define two coupled photochromic systems, respectively in acidic and basic media, both allowing cycles capable of writing, reading and erasing to be defined.

Graphical abstract: Two coupled photochromic systems of 3′,4′-(methylenedioxy)flavylium: kinetic and thermodynamic characterization

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Article information

DOI
https://doi.org/10.1039/B405346J
Article type
Paper
Submitted
08 Apr 2004
Accepted
04 Jun 2004
First published
16 Aug 2004

New J. Chem., 2004,28, 1221-1226

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Two coupled photochromic systems of 3′,4′-(methylenedioxy)flavylium: kinetic and thermodynamic characterization

D. Fernández, F. Folgosa, A. J. Parola and F. Pina, New J. Chem., 2004, 28, 1221 DOI: 10.1039/B405346J

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