Abstract

2-Substituted 7-oxo-7,11b-dihydrodibenzochromenilium derivatives (1-ArPyl(+)s) undergo reversible changes in near-infrared absorption when Ar = ferrocenyl, and complete on-off switching of luminescence when Ar = p-tolyl, m-tolyl, or phenyl, by the reaction with methanol or methoxide ion and with acid.

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