4-bromo-9,9'-Spirobi[9H-fluorene

4-bromo-9, 9'-Spirobi[9H-fluorene is a kind of fluorene which is a polycyclic aromatic hydrocarbon. It can be used as the intermediate of organic light-emitting diodes (OLEDs)

4-bromo-9,9'-Spirobi[9H-fluorene has a spiro conjugation effect, which is characterized by making the molecules coplanar and the electron cloud averaged, and controlling the effective conjugation length while ensuring the length of the spiro molecular chain; rigid planar structure, high fluorescence quantum yield; compared with other positions, the position of the 4-bromo-9,9-spirobifluorene structure has higher reactivity and is extremely easy to be modified. Due to the above advantages, the synthesis of 4-bromo-9,9'-Spirobi[9H-fluorene has received more and more attention, and it has a wide range of applications in optoelectronic materials, organic solar cells, organic nonlinear materials, and fluorescent probes.

Jiang, Z., et al. "Novel oligo-9, 9'-spirobifluorenes through ortho-linkage as full hydrocarbon host for highly efficient phosphorescent OLEDs."Organic Letters 11.12(2009):2607-10.
Sébastien Thiery et al. "4-Pyridyl-9, 9′-spirobifluorenes as Host Materials for Green and Sky-Blue Phosphorescent OLEDs." Journal of Physical Chemistry C 119.11(2015):150204142546002.