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<p>The synthesis of photochromic 3,3-di(<mml:math>   <mml:msup>    <mml:mn>4</mml:mn>    <mml:mo>&#x2032;</mml:mo>   </mml:msup> </mml:math>-fluorophenyl)-3H-benzopyrans fused to an indole moiety is described. The structures of photomerocyanines elucidated by NMR spectroscopy and spectrokinetic data (<mml:math>   <mml:msub>    <mml:mi>&#x03BB;</mml:mi>    <mml:mrow><mml:mi>max</mml:mi><mml:mo>&#x2061;</mml:mo>    </mml:mrow>   </mml:msub> </mml:math> of colored form, colorability, and rate constant of bleaching) obtained by UV-visible spectroscopy are reported.</p

Photochromism of indolino-benzopyrans studied by NMR and UV-visible spectroscopy