Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 209, Issue 2-3, Pages 111-120Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2009.10.014
Keywords
Complexation; Photochromism; Metal cations; Crown-ether; Benzopyran
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Funding
- Reseau Formation-Recherche Franco-Russe du Ministere de la Jeunesse de l'Education Nationale et de la Recherche
- Region Nord-Pas de Calais (France)
- Ministere de la Jeunesse de l'Education Nationale et de la Recherche (MJENR)
- Fonds Europeens cle Developpement Regional (FEDER)
- Russian Foundation for Basic Research [09-03-00283]
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Complexation between a benzopyran entity annulated with a 15-crown-5 ether unit and three metal cations, Mg2+, Ba2+. and Pb2+ has been investigated by UV-vis and NMR spectroscopy. The complexes composition, the stability constants and the structural arrangements have been determined. The photochemical and thermal properties of the photochromic benzopyran derivative in absence and in the presence of metals have been studied. The metal-ion-binding ability of the fused macrocyclic entity drastically modifies photochromism by decreasing the thermal stability of photomerocyanines, whereas the metal cations are partially ejected from crown-ether cavity when benzopyran is in open configuration. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.
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