Photocontrol of Ca2+ complexation with an azacrown-containing benzochromeneстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The new azacrown-containing benzochromene 1a was synthesized in order to study the effect of its reversible photochromic reaction on complex formation with Ca2+ in acetonitrile. It was found that both the initial chromene la and its photoinduced merocyanine isomer 2a are able to form 1:1 complexes with Ca2+, in which the metal cation coordinates to the crown ether moiety. The complexation causes strong spectroscopic shifts and leads to an increase in the dark lifetime of 2a. The equilibrium constant for the 1: 1 complexation decreases upon photoinduced ring-opening reaction (log K = 4.9 and 4.1 for 1a and 2a, respectively). Copyright (C) 2003 John Wiley Sons, Ltd.