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We report a new route to benzo[f ]isoindole derivatives that possess strong fluorescence. The structure of the newly synthesised compounds was confirmed by NMR, IR and mass spectra, along with X-ray crystallographic studies. Absorption and fluorescence spectra of the new compounds were recorded. It was established that tautomerism of 4-aminobenzo[f ]isoindoles defines the properties of these compounds. Also, the influence of substituents at the N-2 position on the luminescence properties was studied; the fluorescence intensity is dependent on the water content in organic solvents, and can be used to indicate their moisture content.

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