Acenaphthene

Acenaphthene
Names
	Preferred IUPAC name 1,2-Dihydroacenaphthylene
	Other names 1,8-Ethylenenaphthalene; peri-Ethylenenaphthalene; Naphthyleneethylene; Tricyclo[6.3.1.04,12]dodecapentaene; Tricyclo[6.3.1.04,12]dodeca-1(12),4,6,8,10-pentaene
Identifiers
CAS Number	83-32-9 ;
3D model (JSmol)	Interactive image; Interactive image;
ChEBI	CHEBI:22154 ;
ChEMBL	ChEMBL1797271 ;
ChemSpider	6478 ;
ECHA InfoCard	100.001.336
EC Number	201-469-6;
KEGG	C19312 ;
PubChem CID	6734;
RTECS number	AB1000000;
UNII	V8UT1GAC5Y ;
UN number	3077
CompTox Dashboard (EPA)	DTXSID3021774 ;
	InChI InChI=1S/C12H10/c1-3-9-4-2-6-11-8-7-10(5-1)12(9)11/h1-6H,7-8H2 Key: CWRYPZZKDGJXCA-UHFFFAOYSA-N ; InChI=1/C12H10/c1-3-9-4-2-6-11-8-7-10(5-1)12(9)11/h1-6H,7-8H2 Key: CWRYPZZKDGJXCA-UHFFFAOYAW;
	SMILES c2cc1cccc3c1c(c2)CC3; c1cc2cccc3c2c(c1)CC3;
Properties
Chemical formula	C12H10
Molar mass	154.212 g·mol−1
Appearance	White or pale yellow crystalline powder
Density	1.024 g/cm3
Melting point	93.4 °C (200.1 °F; 366.5 K)
Boiling point	279 °C (534 °F; 552 K)
Solubility in water	0.4 mg/100 ml
Solubility in ethanol	slight
Solubility in chloroform	slight
Solubility in benzene	very soluble
Solubility in acetic acid	soluble
Vapor pressure	0.001 to 0.01 mmHg at 68°F; 5 mmHg at 238.6°F
Magnetic susceptibility (χ)	−0.709·10−6 cm3/g
Thermochemistry
Heat capacity (C)	190.4 J mol−1 K−1
Std molar; entropy (S⦵298)	188.9 J mol−1 K−1
Std enthalpy of; formation (ΔfH⦵298)	70.3 kJ/mol
Hazards
NFPA 704 (fire diamond)	2 1 1
Flash point	135 °C (275 °F; 408 K)
Autoignition; temperature	> 450 °C (842 °F; 723 K)
Safety data sheet (SDS)	ICSC 1674
	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

Acenaphthene is a polycyclic aromatic hydrocarbon (PAH) consisting of naphthalene with an ethylene bridge connecting positions 1 and 8. It is a colourless solid. Coal tar consists of about 0.3% of this compound.