Ossila 2,7-Dibromo-9,9′-spirobifluorene B1001

2,7-Dibromo-9,9′-spirobifluorene (DBSBF, CAS 171408-84-7) is a synthesis intermediate for building semiconducting small molecules and polymers with a spirobifluorene core. These materials are used in high-efficiency OLEDs, perovskite solar cells and other organic electronic devices. The compound carries two bromine atoms at the 2,7-positions of one of the two linked fluorene units, and is supplied at >99% purity (HPLC) as a white to off-white powder or crystals.

The bromide end groups make the molecule well suited to coupling reactions, so derivatives with different electronic and physical properties can be prepared. The spiro-linked sp3 carbon at the 9-position interrupts conjugation, which raises triplet energy, while the twisted, non-coplanar geometry prevents tight molecular packing. This favours amorphous glassy films with good morphological stability, a higher glass transition temperature and thermal and chemical robustness, and leaves space for further substitution at the 2,7-positions.

Well-known spirobifluorene materials include the hole transport material Spiro-NPB and the electron transport material SPPO13. DBSBF itself can be made by reacting 2,7-dibromo-9-fluorenone with the Grignard reagent of 2-bromobiphenyl.

• Synthesis of spirobifluorene-based host, emitter and charge transport materials for OLEDs.
• Preparation of semiconducting molecules and polymers for perovskite solar cells and organic photovoltaics.
• Building block for low band gap polymers and OFET materials.
• Starting material for coupling reactions to create derivatives with tailored electronic properties.

• Product code: B1001
• M​olecular Weight: 474.19 g/mol
• Synonyms: 2,7-Dibromo-9,9′-spirobi[9H-fluorene], DBSBF
• Melting Point: 334 °C - 336 °C
• Classification / Family: Spirobifluorene, semiconductor synthesis intermediates, low band gap polymers, OLED, OFETs, organic photovoltaics

—

—