An NMR investigation of the merocyanine dyes generated by protolysis of some novel spironaphthopyranoindoles

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Two novel amino-substituted spiroindolinonaphthopyrans have been synthesised. Whilst these compounds exhibit no observable photochromic properties at ambient temperature, protonation gives stable, intensely coloured dyes. 1H nmr spectroscopy has been used to establish the configuration of these dyes.

Original languageEnglish
Pages (from-to)35-43
Number of pages9
JournalDyes and Pigments
Issue number1
Publication statusPublished - 30 Apr 1999
Externally publishedYes


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