Add time:09/29/2019         Source:infona.pl

Four novel styryl—dihydrobenzo[a]phenazine chromophores have been synthesized and spectroscopically characterized. They respond to acids and bases through changes in absorption resulting in strong bathochromic shift (>437 nm). The emission quantum yields of the dyes were in the range 0.11–0.14. Computational studies have been performed to provide further insights into the nature of electronic transitions for the synthesized dyes. The qualitative trends observed in the optical properties, halochromism and geometrical isomers were supported by density functional theory (DFT) computations.

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