Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
COLOR REACTION OF HEAVIER RARE EARTHS WITH CHLOROPHOSPHONAZO III
Tomitsugu TaketatsuNoriko Kono
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1974 Volume 3 Issue 9 Pages 989-992

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Abstract

In absorption spectra of heavier rare earth (Gd to Lu) chelates of Chlorophosphonazo III, the absorption bands extend from 700 to 800 nm with a maximum at approximately 745 nm. The intensity of these bands increases with an increase in the mole ratio of the metal to the reagent and in the atomic number. Also it depends upon the pH value and the elapsing time. The corresponding chelates of lighter rare earths (La to Eu) do not exhibit a similar maximum under the same conditions.

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