9,9-Dimethylfluorene Chemical Properties

Melting point:

96°C

Boiling point:

287 °C

Density 

1.040±0.06 g/cm3(Predicted)

storage temp. 

Sealed in dry,Room Temperature

form 

powder to crystal

color 

White to Almost white

λmax

301nm(EtOH)(lit.)

InChIKey

ZHQNDEHZACHHTA-UHFFFAOYSA-N

CAS DataBase Reference

4569-45-3(CAS DataBase Reference)

NIST Chemistry Reference

9H-Fluorene, 9,9-dimethyl-(4569-45-3)

Safety Information

Risk Statements 

20/21/22-36/37/38

Safety Statements 

26-37/39

HS Code 

2902.90.9000

9,9-Dimethylfluorene Usage And Synthesis

Uses

This product offered here allows an ambient-air-tolerant method for negative electrode prelithiation prior to assembly of Li ion batteries. The redox potential of this product makes it useful for those most reported negative electrodes including Si with high capacities and short processing time. It could not only compensate for the initial active lithium loss, but also enable the pairing with high-capacity lithium-free positive electrodes (e.g. sulfur, oxygen, V2O5 etc.) th at requires the supply of Li source from the negative electrode to configure Li ion batteries with high energy densities.
Recommended instructions (this should be a separate document):Soak your electrode with the anode material coated on a copper current collector in this prelithiation reagent for a set amount of time. Discard the solution and then wash your electrode twice with THF. For a 1cm diameter electrode with 1∼3 mg acitve material per cm2, use 0.5∼1 mL of prelithiation solution will be enough. You can use an empty coin cell casing as the treatment vessel. Electrode soaking time is important and may need to be optimized for your application. A good time to try is ∼10 min. Longer prelithiation time may cause eletrode structure deformation, leading to a decreased discharge/charge capacity.

Definition

9,9-Dimethylfluorene is an organic electroluminescent material intermediate. The fluorene derivative is a kind of organic electroluminescent material commercialized at present, wherein 9, 9-dimethyl fluorene is an essential intermediate for synthesizing OLED material.

Synthesis

The method comprises taking dimethyl carbonate as a methylating agent under alkaline substances and reacting with fluorene in an organic solvent system within a certain temperature range to prepare the 9,9-Dimethylfluorene. The method uses dimethyl carbonate as a methylating agent so that the reaction process is stabilized and the economy is greatly improved; meanwhile, the use of dimethyl carbonate avoids the use of low-boiling-point hypertoxic such as methyl iodide, methyl bromide, and the like, is environment-friendly, and the generated wastewater has single component and is convenient to treat.

9,9-Dimethylfluorene(4569-45-3)Related Product Information

• Dichlorodimethylsilane
• ETHANE
• Poly(dimethylsiloxane)
• Dimethyl sulfoxide
• Dimethyl fumarate
• Dacthal
• Dimethyl disulfide
• Dimethyl sulfone
• N,N-Dimethylformamide
• N,N-Dimethylaniline
• Fluorene
• Dimethyl sulfate
• Dimethyl ether
• Dimethyl carbonate
• N,N-Dimethylacetamide
• 9,9-BIS(2-CYANOETHYL)FLUORENE
• 9[3[(1methylethyl)amino]propyl]-fluorene-9-carboxamide
• 9,9-Bis(4-hydroxyphenyl)fluorene