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An insitu colorimetric method, based on the CIE (Commission Internationale de l’Eclairage) system of colorimetry, has been applied to the study of the electrochromic N,N′-bis(n-heptyl)-4,4′-bipyridylium (di-n-heptyl viologen) system in aqueous solution on transmissive ITO/glass substrates. On electrochemical reduction of the di-n-heptyl viologen di-cation, the purple di-n-heptyl viologen radical cation...
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