Two stage colour modulation of triarylmethine dyes derived from a photochromic naphthopyran

Christopher D. Gabbutt, B. Mark Heron, Suresh B. Kolla, Matthew Mcgivern

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The synthesis of the unsymmetrical triarylmethine dyes 4 derived from a lithiated naphthopyran and diaryl ketones is reported. In toluene solution 4 display a typical reversible photochromic response becoming coloured upon irradiation with UV light and fading upon cessation of irradiation. At low pH an intensely coloured dye cation is generated and UV irradiation of this solution results in a further colour change as a consequence of photochromic cycling of the naphthopyran unit.

Original languageEnglish
Pages (from-to)2031-2034
Number of pages4
JournalEuropean Journal of Organic Chemistry
Issue number12
Publication statusPublished - 2 Apr 2008
Externally publishedYes


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