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International Journal of Photoenergy
Volume 6, Issue 4, Pages 199-204

Photochromic properties of six 5-O-n-alkyl, 6-CN substituted spironaphthoxazines

1IPOC, Rostov State University, Rostov on Don 344090, Russia
2IMRCP, UMR CNRS 5623, Université Paul Sabatier, Toulouse Cedex F-31062, France
3GCOM2, UMR CNRS 6114, Université de la Méditerranée, Marseille Cedex 9 F-13288, France

Copyright © 2004 Hindawi Publishing Corporation. 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.


The photochromic properties of a series of six 5-O-n-alkyl, 6 -CN substituted spironaphthoxazines has been investigated in toluene and methanol solution. The 6 -CN and 5-O-n-alkyl substitutions lead to a bathochromic shift of the UV spectra of the closed forms. The λmax of the visible spectra of the open forms decrease with solvent polarity. Most of the photochromic parameters have been quantitatively determined. Among them, photocoloration and photobleaching quantum yields and molar absorption coefficients of the open forms have been derived from a numerical fitting of the photokinetic curves recorded under continuous monochromatic irradiation. Results show that the photo-steady-state properties are relatively independent of the 5-O-n-alkyl chain length, but are more sensitive to the size of the indolinic nitrogen substituent.