title: Spectrophotometric studies of ruthenium(III)and rhodium(III)-oximidobenzotetronic acid complexes and the simultaneous determination of the two metals.
abstract: 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 pH 2-8; at higher pH (11.5 and above) the complex is reddish-brown, but has the same Rh:OBTA ratio. A method for the simultaneous determination of these two metals is proposed, and the interference by commonly occurring ions has been investigated.
authors.affiliation: Department of Chemistry, University of Delhi, Delhi-7, India.
authors.forename: G S
authors.initials: GS
authors.lastname: Manku
authors.forename: A N
authors.initials: AN
authors.lastname: Bhat
authors.forename: B D
authors.initials: BD
authors.lastname: Jain