Spectrophotometric studies on Ce [III], Th [IV], UO2 [VI] and VO [IV] complexes with 6,7-dihydroxy-4-methylcoumarin

ABSTRACT

The complexes of Ce [III], Th [IV], UO2 [VI] and VO [IV] with 6, 7-dihydroxy-4 methylcoumarin are investigated using spectrophotometric methods. The optimum conditions favoring the formation of their colored complexes are critically evaluated. The studies reveal that 1 1, 1 2 and 1 3 [M L] complexes are formed in solution. The stability constants of the different complexes are calculated. The effect of diverse ions is investigated. A spectrophotometric method for the determination of the named metal ions is represented also a photometric titration method using EDTA as titrant is also given. The proposed method is applicable to the ppm range the metal ions with high accuracy and precession