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International Journal of Photoenergy
Volume 2009, Article ID 238615, 6 pages
http://dx.doi.org/10.1155/2009/238615
Research Article

Synthesis of Novel Iono- and Photochromic Spiropyrans Derived from 6,7-Dihydroxy-8-Formyl-4-Methyl-2H-Chromene-2-One

1Institute of Physical and Organic Chemistry, Southern Federal University, 344090 Rostov on Don, Russia
2Southern Scientific Center of Russian Academy of Sciences, 344006 Rostov on Don, Russia

Received 31 March 2009; Accepted 29 May 2009

Academic Editor: Mohamed Sabry Abdel-Mottaleb

Copyright © 2009 Olga G. Nikolaeva et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Novel photochromic spiropyrans (SPPs) containing -hydroxy group were synthesized and their spectral properties as well as abilities for complexation with metal ions studied. In solutions they exist as equilibrium mixture of spirocyclic (A) and merocyanine (B) isomers. The largest content of merocyanine form was found for the derivative with an electron-donating methyl group in position 5 of hetaryl fragment. The irradiation of SPPs in acetonitrile shifts the equilibrium to the B form. Similar effect causes the addition of metal cations due to formation of colored complexes with merocyanine isomers.