Skip to main content
padlock icon - secure page this page is secure

Open Access Stable Water Insoluble Radicals of 1,1'',1"'-tribenzyl[4,2'; 4',4'; 6',4''']quaterpyridinium Trichloride for Photochromic Films

Download Article:
(PDF 300.1 kb)
The electron relay compound 1,1'',1"'-tribenzyl[4,2'; 4',4'; 6',4''']quaterpyridinium trichloride (R7B) can be chemically or electrochemically reduced to a blue species which is insoluble in water and stable against oxygen in contrast to that obtained by reduction of methyl viologen. The species has a radical electronic structure as confirmed by EPR. Electrochemical reduction of R7B on SnO2 coated glass leads to water insoluble films. The colour of these radicals is dependent on pH; they are colourless in acidic and blue in alkaline solutions, which is ascribed to the reversible formation of a protonated charge transfer radical complex. R7B shows strong fluorescence. Under UV illumination, the excited state of R7B is reductively quenched by electron donors leading to the blue radical. Immobilization of such a system on a solid substrate leads to remarkable persistence of the colour (keeping the photochemically reduced films of R7B in the dark gave no detectable changes after one year) which can be used for long time optical information storage.

7 References.

No Supplementary Data.
No Article Media
No Metrics


Document Type: Short Communication

Publication date: December 1, 2011

More about this publication?
  • Materials Express is a peer-reviewed multidisciplinary journal reporting emerging researches on materials science, engineering, technology and biology. Cutting-edge researches on the synthesis, characterization, properties, and applications of a very wide range of materials are covered for broad readership; from physical sciences to life sciences. In particular, the journal aims to report advanced materials with interesting electronic, magnetic, optical, mechanical and catalytic properties for industrial applications.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more