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New 2,2′-thio-bis [4-methyl (2-amino phenoxy) phenyl ether] (IV) was synthesized. The structure of this compound was confirmed on IR, 1H, and 13C NMR data. A simple, efficient, and sensitive procedure is described for the spectrophotometric determination of a trace amount of Cd(II) or Co(II) in the presence of Zn(II) with this diamine.
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