Fluorene

• Diphenylenemethane
• 9H- fluorene
• O- Biphenylmethan
• 2,2 '- Methylenbiphenyl
• 2,3- Benziden
• FLO

Colorless leaflets

Fixed

1.2 g · cm -3

113-115 ° C

295 ° C.

• Insoluble in water ( 1.8 mg · l-1 at 25 ° C)
• Soluble in benzene and diethyl ether, acetone, and boiling ethanol

Attention

16000 mg · kg -1 ( LD50, rat, oral)

Template: Infobox chemical / molecular formula search available

Fluorene is a chemical compound belonging to the group of polycyclic aromatic hydrocarbons ( PAHs). Fluorene lights when irradiated with UV light violet, which gave its name to the connection (see also: fluorescence).

Occurrence

Fluorene occurs in nature as the extremely rare mineral Kratochvílit.

Production and representation

Fluorene is obtained industrially from coal tar, and indeed from the wash oil fraction in the distillation of tar. The substance is also produced in small amounts among other polycyclic aromatic compounds in the heating or combustion of organic material under oxygen deficiency, in traces in the combustion of gasoline and diesel.

Properties

A special feature of fluorene is that it yields an aromatic anion upon deprotonation. This is similar to the cyclopentadienyl anion. Thus, the fluorenyl anion is used analogously to the cyclopentadienyl and indenyl anion as a ligand in organometallic chemistry. The group fluorenylmethoxycarbonyl ( Fmoc), which is easy to deprotonate because of the said property, serves as a base- cleavable protecting group in chemical peptide synthesis.

Use

Fluorene is used for the production of paint and plastics, as well as pesticides. Polyfluorene is widely used as a luminophore in organic light emitting diodes. Fluorene and some of its derivatives act as mitogens, that is, they initiate a cell division. This explains the possible use of fluorene fluorine and carboxylic acids as plant growth substances. In medicine, non-toxic fluorine derivatives (eg, fluorenone ) as a drug to increase tissue formation after transplantation discussed (see web link).