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Quantitative investigations of cation complexation of photochromic 8-benzothiazole-substituted benzopyran: towards metal-ion sensors

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Abstract

The photochromic, thermochromic and metallochromic behaviour of a series of three spiro[indoline-8-(benzothiazol-2-yl)-benzopyrans] has been investigated. The thermodynamic and kinetic parameters of their thermal equilibrium between the ring-closed (spiro) and ring-opened (merocyanine) isomeric forms have been determined using UV-Vis absorption and 1H NMR spectroscopies. By adding Co(ii) and Ni(ii) ions in acetonitrile solution, 1: 1 and 1: 2 metal: merocyanine complexes are formed simultaneously. Using appropriate numerical methods, the kinetic analysis of the complexation allowed us to determine accurately key thermodynamic and spectroscopic parameters of the metal complexes. Results showed that the complexation strength is very sensitive to the size of the indolinenitrogen substituent. Complexation can be reversed by shining white light on the coloured complexes which regenerates the inactive spiropyran form, and releases the metallic ion; hence, these systems display fully reversible negative photochromism. The Zn(ii) complexes exhibit intense fluorescence in the 600-800 nm wavelength range. All these behaviours make these spiropyrans bearing benzothiazole heterocycles promising building blocks for the future construction of photodynamic chemosensors for transition metal ions.

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Authors and Affiliations

  1. IMRCP, UMR 5623, Univ. P. Sabatier, F-31062, Toulouse, Cedex, France

    Marianna I. Zakharova, Christophe Coudret, Véronique Pimienta & Jean Claude Micheau

  2. Univ. Lille Nord de France, CNRS UMR 8009, UDSL, F-59000, Lille, France

    Stéphanie Delbaere & Gaston Vermeersch

  3. Institute Phys. Org. Chem., Southern Federal University, Rostov on Don, Russia

    Marianna I. Zakharova, Anatoly V. Metelitsa & Vladimir I. Minkin

  4. Southern Scientific Center of Russian Academy of Science, Rostov on Don, Russia

    Nikolai Voloshin

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  1. Marianna I. Zakharova
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  2. Christophe Coudret
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  3. Véronique Pimienta
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  4. Jean Claude Micheau
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  7. Anatoly V. Metelitsa
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  9. Vladimir I. Minkin
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Correspondence to Jean Claude Micheau.

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This paper is part of a themed issue on synthetic and natural photoswitches.

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Zakharova, M.I., Coudret, C., Pimienta, V. et al. Quantitative investigations of cation complexation of photochromic 8-benzothiazole-substituted benzopyran: towards metal-ion sensors. Photochem Photobiol Sci 9, 199–207 (2010). https://doi.org/10.1039/b9pp00112c

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