Abstract
Simple, rapid, and reproducible back titration methods for the determination of thiosemicarbazide (TSC) in free state and in Zn, Cd, Hg, Ni, Pt, and Pd metal complexes with bromamine-B (BAB) and dichloramine-B (DCB) have been developed. The oxidation reaction involves a 12-electron change per TSC molecule in 0.2–1.0 M NaOH and water-acetic acid media with BAB and DCB, respectively. The proposed analytical procedures for the assay of TSC are also useful for computing the number of TSC ligands present in the respective metal complexes. The two aromatic sulfonyl haloamines used, BAB and DCB, were prepared and then characterized by 13C FT-NMR spectral data.
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