Spectrophotometric studies of ruthenium(III)and rhodium(III)-oximidobenzotetronic acid complexes and the simultaneous determination of the two metals

Ruthenium(III) and rhodium(III) form stable coloured complexes in ethanolic solution with oximidobenzotetronic acid (OBTA). Ruthenium forms a purple-violet Ru(OBTA) 3 complex at pH 1.1–3.5, which is stable over the pH range 1.1–11.3. Rhodium(III) forms a yellowish-brown complex, RhCl 2(OBTA) 2, at p...

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