Spectrophotometric determination of 1-naphthol via charge transfer complex formation

Abstract EN

Two new simple, sensitive and economical spectrophotometric methods have been developed for the determination of 1-naphthol in pure form.

These methods are based on the reaction of 1-naphthol as n-electron donor with chloranil in method A and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) in method B as π-acceptors to give highly coloured complex species in aqueous solution which are absorb maximally at 349nm and 423 nm respectively.

Beer's law is obeyed in the concentration ranges 1-36 μg ml-1 and 0.4-5.0 μg ml-1 with high apparent molar absorptivities of 2.59 × 103and 94.9 × 103 for methods A and B respectively.