Phenalene

Phenalene
Names
	Preferred IUPAC name 1H-Phenalene
	Other names 1-Benzonaphthene; 1H-Benzonaphthene; Perinaphthene; Perinaphthindene; peri-Naphthindene
Identifiers
CAS Number	203-80-5 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:33082 ;
ChemSpider	8795 ;
ECHA InfoCard	100.005.371
PubChem CID	9149;
UNII	DQ27KZF2V7 ;
CompTox Dashboard (EPA)	DTXSID5075369 ;
	InChI InChI=1S/C13H10/c1-4-10-6-2-8-12-9-3-7-11(5-1)13(10)12/h1-8H,9H2 Key: XDJOIMJURHQYDW-UHFFFAOYSA-N ; InChI=1/C13H10/c1-4-10-6-2-8-12-9-3-7-11(5-1)13(10)12/h1-8H,9H2 Key: XDJOIMJURHQYDW-UHFFFAOYAK;
	SMILES c3c1cccc2\C=C/Cc(c12)cc3;
Properties
Chemical formula	C13H10
Molar mass	166.22 g/mol
Appearance	white solid
Density	1.139 g/cm3
Melting point	159–160 °C (318–320 °F; 432–433 K)
Acidity (pKa)	18.1 (in DMSO)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

1H-Phenalene, often called simply phenalene is a polycyclic aromatic hydrocarbon (PAH). Like many PAHs, it is an atmospheric pollutant formed during the combustion of fossil fuels. It is the parent compound for the phosphorus-containing phosphaphenalenes.

The name was proposed by German chemists in 1922 as a contraction of periphenonaphthalene.