Pentafluorobenzene

Structural formula
General
Surname	Pentafluorobenzene
Molecular formula	C 6 HF 5
External identifiers / databases
CAS number 363-72-4 EC number 206-658-7 ECHA InfoCard 100.006.054 PubChem 9696 Wikidata Q1265485
properties
Molar mass	168.06 g mol −1
Physical state	liquid
density	1.514 g cm −3 (25 ° C)
Melting point	−47.4 ° C
boiling point	85.74 ° C
Refractive index	1.3905 (20 ° C)
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 225-302-315-318-335 P: 210-261-280-305 + 351 + 338
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C

Pentafluorobenzene is a benzene substituted with five fluorine atoms and a liquid with a melting point of −47.4 ° C. In comparison with the tetrafluorobenzenes , the melting point is lower than that of 1,2,4,5-tetrafluorobenzene at 3.88 ° C due to the lower symmetry . The higher degree of substitution compared to the other two isomers is of no consequence here. There is only a slight difference to their melting points of −42 ° C and −46.25 ° C. More remarkable are the slight differences between the melting and boiling points and its substitution inverse, fluorobenzene (−42 ° C and 85 ° C, respectively).

Individual evidence

1. ↑ ^{a b c d} David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Physical Constants of Organic Compounds, pp. 3-414.
2. ↑ ^{a b} Datasheet Pentafluorobenzene purum from Sigma-Aldrich , accessed on October 20, 2016 ( PDF ).
3. ↑ ^{a b} Entry on fluorobenzene in the GESTIS substance database of the IFA , accessed on January 30, 2017(JavaScript required) .