Spectrophotometric determination of 1-naphthol via charge transfer complex formation

Abstract

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.