Issue 14, 2006

Photo-regenerable surface with potential for optical sensing

Abstract

Photochromic spiropyran was covalently immobilized using alkyldiamine couplers with varying chain length (2, 4, 6, 8 methylene groups) onto an optically transparent polymeric surface. The relatively nonpolar and colourless spiropyran form can be reversibly switched to a charged, highly coloured, zwitterionic merocyanine isomer using UV and visible light, respectively. The merocyanine form complexes with metal ions, and this results in a shift in the absorbance spectrum, and a corresponding colour change is observed. Upon irradiation of the complex with visible light, the cation is released and the merocyanine (active) isomer reverts back to the spiropyran (passive) form. Optical switching and complexation behaviour of the polymer-bound spiropyran–merocyanine system is highly dependent on the tether length of the spiropyran from the polymeric surface. The effect is demonstrated using cobalt(II) chloride in solution.

Graphical abstract: Photo-regenerable surface with potential for optical sensing

Article information

Article type
Paper
Submitted
18 Nov 2005
Accepted
04 Jan 2006
First published
13 Jan 2006

J. Mater. Chem., 2006,16, 1332-1337

Photo-regenerable surface with potential for optical sensing

R. J. Byrne, S. E. Stitzel and D. Diamond, J. Mater. Chem., 2006, 16, 1332 DOI: 10.1039/B516400A

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