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International Journal of Photoenergy
Volume 2013 (2013), Article ID 752949, 8 pages
Research Article

Theoretical and Experimental Study of New Photochromic Bis-Spiropyrans with Hydroxyethyl and Carboxyethyl Substituents

1Research Scientific Institute of Physical & Organic Chemistry, Southern Federal University, Stachky Avenue 194/2, Rostov-on-Don 344090, Russia
2Southern Science Center, Russian Academy of Sciences, Chekhova Street 41, Rostov-on-Don 344006, Russia

Received 31 May 2013; Accepted 25 July 2013

Academic Editor: Mark van Der Auweraer

Copyright © 2013 E. L. Mukhanov 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.


Two new asymmetrical bis-spiropyrans with nonequivalent spiropyran units have been investigated. Hydroxyethyl and carboxyethyl substituents have been used to improve thermal stability of the photoinduced merocyanine forms of the bis-spiropyrans. 2-Hydroxyethyl substituted compound is characterized by 4 times more stable merocyanine isomer. 2-Carboxyethyl substituent in the hetarene part enables chelation by metal ions and controllably stabilizes the merocyanine from thermal decay. As a result of theoretical modeling and photochemical experiments, it was shown that obtained compounds are perspective prototypes for multistate light-driven switches with improved stability of photoinduced forms.