Polarographic Study of Copper (II) Complexes with Some Naphthoquinonic Derivatives

Abstract

Differential pulse polarography has been used to investigate the complexation reaction occuring between copper (II) ions and some naphthoquinonic derivatives. The importance of the substituent at the 2-position on the naphthoquinone ring has been demonstrated. Compared with 1,4-naphthoquinone which exhibits a very weak complex, the presence of a methyl group enhances the complexation reaction while a hydroxy group has an inhibiting effect. Naftazone, which includes a semicarbazone group, gives rise to a stronger reaction due to the participation of the side chain i n the complex formation.

Key Words:

• copper
• naphthoquinones
• complexes
• polarography