yellow-greenish to yellow-brownish powder
2-nitroso-1-naphthol helps in the extraction of cobalt ion as it is used as a selective complexing agent. It is used in the separation and preconcentration of Th(IV), Ti(IV), Fe(III), Pb(II) and Cr(III) by solid phase extraction.
Moderately toxic by
ingestion. Many nitroso compounds are
carcinogens. Questionable carcinogen with
experimental tumorigenic data. When heated
to decomposition it emits toxic fumes of
NOx. See also NITROSO COMPOUNDS.
Purify the naphthol by recrystallisation from pet ether (b 60-80o) or by dissolving it in hot EtOH, followed by successive addition of small volumes of water (m 158o dec). It also crystallises from *C6H6 or H2O. Crystallisation from *C6H6/pet ether gives m (106-109 o, also 109.5o). It has max at 274.5 and 382nm (CHCl3). It complexes with metals. [Beilstein 7 H 712, 7 I 385, 7 II 647, 7 III 3688, 7 IV 2419.]
