The synthesis of spiro[fluorene-naphthopyrans] and spiro[fluorene-furano [3,2-flchromenes] allowed us to quantify the role of fluorene moiety towards photochromic properties. Compared to corresponding diphenylchromenes, the extended II system delocalization causes a bathochromic shift of the visible absorption of the colored merocyanines. Whatever the right hand side in the studied series, an hyperchromic effect is observed.
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Pozzo et al. (1997) studied this question.
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