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Structural and photochemical aspect of metal-ion-binding to a photochromic chromene annulated by crown-ether moiety

Paper ID Volume ID Publish Year Pages File Format Full-Text
27149 44005 2010 10 PDF Available
Title
Structural and photochemical aspect of metal-ion-binding to a photochromic chromene annulated by crown-ether moiety
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.

Keywords
Complexation; Photochromism; Metal cations; Crown-ether; Benzopyran
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Structural and photochemical aspect of metal-ion-binding to a photochromic chromene annulated by crown-ether moiety
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 209, Issues 2–3, 25 January 2010, Pages 111–120
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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