Novel stable blue-light-emitting oligofluorene networks immobilized by boronic acid anhydride linkages

摘要: Thermal dehydration of boronic acid groups to form six-membered anhydride (boroxine) was employed as a means immobilizing oligofluorenes. This approach appears improve the photoluminescenct stability cross-linked films compared polyfluorenes. The emergence long-wavelength emission upon thermal treatment usually observed in polyfluorenes has been prevented this system. Initially fluorene dimer (F2BA), trimer (F3BA), and tetramer (F4BA) containing were prepared. These compounds found be readily soluble common solvents such THF, acetone, DMF. Transparent thin these materials could easily prepared by casting their solutions THF onto KBr disks or glass substrates. Using mild reaction conditions (60−130 °C under vacuum for 2 h), oligomers solid sate undergo cross-linking reactions evidenced FT-IR spectroscopy DSC/TGA studies. resulting cross-lin...