Elaboration, structure and fluorescence spectroscopy of iodophenyl-BODIPY crystals
Résumé
We present the synthesis of 2,6-diethyl-4,4-difluoro-8-(-4-iodophenyl)-1,3,5,7-tetramethyl-4-bora-3a,4a-diaza-s-indacene labeled as iodophenyl-BODIPY (IP-BDPY) and the growth of microcrystals or spherulitic crystal plates in typical free solutions. Their crystal structures, the absorption and fluorescence spectroscopies were investigated. Relations between crystal structure and absorption, dichroism and fluorescence properties were established. The first results obtained for the preparation of IP-BDPY nanocrystals grown in sol-gel thin films were also introduced. Their absorption and fluorescence spectra were compared with the spectra of the corresponding bulk crystal and diaplectic amorphous solid obtained by a drastic crushing. Unexpected results were obtained: amorphization of molecular nanocrystals just after their growth by capillary forces generated during the drying of sol-gel thin films.