Fluorene
CAS Number
86-73-7
EC Number
201-695-5
What is Fluorene?
Fluorene (CAS 86-73-7), also known as o-biphenylenemethane, is a polycyclic aromatic hydrocarbon; a core building block in the synthesis of advanced organic materials and pharmaceutical intermediates.
Where is Fluorene used?
- Electronics and optoelectronics: foundational monomer
- Polyfluorene-based polymers in organic light-emitting diodes (OLEDs) and organic photovoltaic devices
- Pharmaceutical intermediates for active ingredients
- Medicinal chemistry: dibenzofuran-adjacent scaffold for target binding profiles
- Specialty polymers: derived monomers in engineering resins and optical films
- Biotechnology: precursor in fluorescent probe synthesis and labeled reagent development
- Its rigid, planar structure makes it a starting material where precise molecular architecture is required.
Commercial specifications
- High-purity grades: 98%–99%+
- Packaging from kilogram-scale laboratory quantities to bulk industrial supply
Other Names (Synonyms)
o-biphenylenemethane|Fluoren|9H-fluorene|2,3-Benzindene|2,2'-Methylenebiphenyl|o-Biphenylmethane|Methane, diphenylene-
What are the physical properties of Fluorene?
Melting Point 116-117 °C
Boiling Point 295 °C
Density 1.203 g/cm³ @ Temp: 0 °C
Flash Point 151 °C
Appearance Fluorene, when pure, is found as dazzling white flakes or small, crystalline plates. It is fluorescent when impure. Polycyclic aromatic hydrocarbons (PAHs) are compounds containing multiple benzene rings and are also called polynuclear aromatic hydrocarbons.
Color Almost white to light brown
Form Crystalline Powder
Water Solubility insoluble
Vapor Pressure 13 hPa (146 °C)
Refractive Index 1.6470
Log P 4.164
How is Fluorene classified and handled safely? Learn More
Warning
GHS09· Environmental Hazard
Hazard Statements
H400 Very toxic to aquatic life
H410 Very toxic to aquatic life with long lasting effects
Precautionary Statements
P273 Avoid release to the environment.
P391 Collect spillage.
P501 Dispose of contents/container in accordance with local regulations.
Which trade and regulatory codes apply to Fluorene?
HS Code 29029080
UN Number 3077
ADR Class 9
Packing Group III
Storage Class 11 - Combustible Solids
WGK (Germany) 3