T. Odashima, F. Anzai, H. Ishii
Oct 1, 1976
Citations
0
Influential Citations
8
Citations
Journal
Analytica Chimica Acta
Abstract
Abstract The analytical properties of 5-chloro-, 5-bromo- and 5-methyl-2-thiophenealdehyde-2-benzothiazolylhydrazone (CTBH, BTBH and MTBH, respectively), are compared with those of 2-thiophenealdehyde-2-benzothiazolylhydrazone (TBH). The acid dissociation constants have been determined, and the 5-substituent effect is discussed. The complex formation of the reagents with several metal ions has been examined spectrophotometrically. Extraction—spectrophotometric determinations of traces of copper are proposed. The copper complexes can be extracted quantitatively into benzene over wide pH ranges (from weakly acidic to alkaline medium) and the molar absorptivities are high (4–5· 104 l mol-1 cm-1). The complexes formed are 1:2 (copper:ligand) in all cases. There are few interferences from common ions except silver(I), mercury(II), thiocyanate and citrate.