Study of complex compounds of rhodium and iridium with 2-mercaptobenzothiazole
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Compounds of rhodium with 2-mercaptobenzothiazole (2-MBT), isolated in the form of precipitation in alkaline (pH 8–10), acetic acid (pH 2–5.8), and hydrochloric acid (0.1–2 N) solutions at a ratio Rh ∶reagent (R)=1∶6, were investigated. In hydrochloric acid medium, in the presence of reducing agents (SnCl2, VCl2), rhodium (III) is reduced in the cold, evidently to rhodium (II), and forms insoluble compounds with 2-MBT. Iridium does not enter into the reaction.
The behavior of complex compounds of rhodium and iridium with 2-MBT toward organic solvents was studied. The absorption spectra were taken in the region of 240–420 nm.
A method was developed for the spectrophotometric determination of rhodium in the presence of 100-fold amounts of Ir(IV) and 1000-fold amounts of Ni(II) and Co(II) in hydrochloric acid medium in the presence of the reducing agents tin(II) or vanadium (II) chloride, at a ratio Rh∶R=1∶16.
KeywordsPrecipitation Acetic Chloride Acetic Acid Absorption Spectrum
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