1-methylnaphthalene

Structural formula
General
Surname	1-methylnaphthalene
other names	α-methylnaphthalene
Molecular formula	C 11 H 10
Brief description	colorless to yellowish, blue fluorescent liquid with an aromatic odor
External identifiers / databases
CAS number 90-12-0 EC number 201-966-8 ECHA InfoCard 100,001,788 PubChem 7002 Wikidata Q161656
properties
Molar mass	142.2 g mol −1
Physical state	liquid
density	1.02 g cm −3
Melting point	−31 ° C
boiling point	245 ° C
Vapor pressure	2 h Pa (25 ° C)
solubility	almost insoluble in water (28 mg l −1 at 25 ° C)
Refractive index	1.61755 (8)
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 302-411 P: 273-301 + 312 + 330-391-501
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

1-methylnaphthalene is a bicyclic, singly alkylated hydrocarbon, composed of eleven carbon atoms and ten hydrogen atoms, which is one of the aromatics .

properties

Pure 1-methylnaphthalene is a colorless, blue fluorescent liquid with an aromatic odor. It occurs in coal tar . The ignition temperature is 485 ° C.

use

In combination with n -hexadecane, 1-methylnaphthalene is used as a reference substance for determining the ignitability ( cetane number ) of diesel fuels. It is also used as a dyeing aid, solvent, dielectric and heat transfer oil.

Individual evidence

1. ↑ ^{a b c d e f g h i j} Entry on 1-methylnaphthalene in the GESTIS substance database of the IFA , accessed on January 8, 2018(JavaScript required) .
2. ↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Index of Refraction of Liquids for Calibration Purposes, pp. 10-251.