Abstract
A new thiacrown compound in which the picrylamino group is introduced as the chromogenic group, 4'-picrylaminobenzo-l,4,8,11-tetrathiacyclopentadec-13-ene (4'-PicNHBz-TTCP), has been successfully synthesized and its characteristics as an extracting and spectrophotometric reagent have been examined. This compound (HL) forms ion-pair complexes (M +L −) with univalent class b metal ions (M +) such as silver and copper(I). The M +L − species can be extracted into 1,2-dichloroethane and spectrophotometrically determined. Not only class a and ab metals but also bivalent class b metals such as mercury(II) and palladium(II) are not extracted at all. As silver and copper(I) ions are effectively extracted at pH above 8.0, a suitable masking agent such as tartrate is used in order to prevent the formation of hydroxides of foreign metals, if necessary.
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