Cationic merocyanine dyes by photomodulation of [4-(naphthopyran-3-yl) phenyl]methines

Stuart Aiken, Danielle Clayton, Christopher D. Gabbutt, B. Mark Heron, Suresh B. Kolla

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


A series of mono-, bis- and tris-4-(naphthopyran-3-yl)phenyl substituted methanols were efficiently synthesised using a 4-(naphthopyran-3-yl) phenyllithium intermediate. The resulting substituted methanols displayed good photochromism leading to the reversible generation of red-orange photomerocyanines. Acidic dehydration of the methanols gave intensely coloured cations which, upon subsequent UV irradiation, reversibly generated cationic photomerocyanines with long wavelength absorption maxima at ca. 640 nm.

Original languageEnglish
Pages (from-to)118-123
Number of pages6
JournalDyes and Pigments
Issue number1
Publication statusPublished - Apr 2013


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