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Product Code B1001-10g
Price £185 ex. VAT

High-Purity 2,7-Dibromo-9,9′-spirobifluorene

Intermediate used for the synthesis of semiconducting molecules, polymers with a spirobifluorene core for applications in highly efficient OLEDs and perovskite solar cells.


Specifications | MSDS | Literature and Reviews


2,7-Dibromo-9,9′-spirobifluorene (CAS number 171408-84-7) is a double brominated derivative of 9,9′-spirobifluorene, only brominated at one of the joined fluorenes.

Bromos at 2,7-positions give 2,7-dibromo-9,9′-spirobifluorene ability to obtain derivatives with varying electronic characteristics and physical properties. The spirobifluorene core at 9-positon can provide certain characteristics like higher triplet energy, elevated glass transition temperature, and thermal and chemical stabilities. It offers the prospect of controlling the molecular interaction of fluorene derivatives in the solid state by its sp3 carbon and twisted non-coplanar structure, preventing the close packing of molecules and generating amorphous glass materials with morphological stability. The connecting sp3 carbon also breaks the conjugation inside the molecule ending with a higher triplet energy. The twisted structure also gives more room for further modification at 2,7-positions.

2,7-Dibromo-9,9′-spirobifluorene can be prepared from 2,7-dribromo-9-fluorenone by reacting with a Grignard reagent of 2-bromobiphenyl. The most commonly known spirobifluorene based hole transport layer material is N2,N7-di(naphthalen-1-yl)-N2,N7-diphenyl-9,9′-spirobi[fluorene]-2,7-diamine (Spiro-NPB), and electron transport layer material 2,7-bis(diphenylphosphoryl)-9,9'-spirobifluorene (SPPO13, M2333A1).

General Information


CAS Number 171408-84-7
Chemical Formula C25H14Br2
Full Name 2,2′,7,7′-Dibromo-9,9′-spirobifluorene
Molecular Weight 474.19 g/mol
Synonyms 2,7-Dibromo-9,9′-spirobi[9H-fluorene], DBSBF
Classification / Family Spirobifluorene, semiconductor synthesis intermediates, low band gap polymers, OLED, OFETs, organic photovoltaics

Chemical Structure


2,7-Dibromo-9,9′-spirobifluorene chemical structure, CAS 171408-84-7
2,7-Dibromo-9,9′-spirobifluorene (DBSBF) chemical structure, CAS 171408-84-7

Product Details


Purity >99% (HPLC)
Melting Point Tm = 334 °C - 336 °C
Appearance White to off-white powder/crystals

MSDS Documentation


2,7-Dibromo-9,9′-spirobifluorene MSDS Sheet2,7-Dibromo-9,9′-spirobifluorene MSDS sheet

Literature and Reviews


  1. Improved Synthesis of 2,2‘-Dibromo-9,9‘-spirobifluorene and Its 2,2‘-Bisdonor-7,7‘-bisacceptor-Substituted Fluorescent Derivatives, C. Chiang et al., Org. Lett. , 7, 17, 3717–3720 (2005); DOI: 10.1021/ol0513591.
  2. Efficient Greenish Blue Electrochemiluminescence from Fluorene and Spirobifluorene Derivatives, F. Polo et al., J. Am. Chem. Soc., 134, 37, 15402–15409 (2012); DOI: 10.1021/ja3054018.
  3. Red-Emitting Fluorenes as Efficient Emitting Hosts for Non-Doped, Organic Red-Light-Emitting Diodes, C. Chiang et al., Adv. Funct. Mater., 15 (2), 231-238 (2005); DOI: 10.1002/adfm.200400102.
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