4-chloro-2-nitroso-l-naphthol

The dyes Rhodamine 6G [55] and Crystal Violet [56] form extractable ion-associates with the anionic complexes of nickel with chloro-oxine [551 and 4-chloro-2-nitroso-l-naphthol [56], (e = 7.7-10 - 8.2-10 ). The ion associate of Rose Bengal with the cationic nickel complex with 1,10-phenanthroline, extractable into nitrobenzene, is also the basis of a sensitive method (e > 1-10 ) [57]. Hydroxynaphthol Blue has been applied for determination of Ni in the presence of Cu by the derivative spectrophotometry method [58]. 

Chloro-7-nitrobenzofurazan, C-00189 4-Chloro-2-nitroso-l-naphthol, in C-00187 4-Chloro-2-nitrosophenol, C-00190... 

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