Structural and photochemical aspect of metal-ion-binding to a photochromic chromene annulated by crown-ether moiety
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Publication Details
Output type: Journal article
Author list: Paramonov SV, Delbaere S, Fedorova O, Fedorov Y, Lokshin V, Samat A, Vermeersch G
Publisher: Elsevier
Publication year: 2010
Journal: Journal of Photochemistry and Photobiology A: Chemistry (1010-6030)
Volume number: 209
Issue number: 2-3
Start page: 111
End page: 120
Number of pages: 10
ISSN: 1010-6030
eISSN: 1873-2666
Languages: English-Great Britain (EN-GB)
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Open access status: closed
Abstract
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.
Keywords
Benzopyran, Complexation, Crown-ether, Metal cations, Photochromism
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