RUTHENIUM(III) GLUCONATE COMPLEXES

Journal Article · Fri Nov 20 04:00:00 EST 1959 · Journal of the American Chemical Society (U.S.)

DOI:https://doi.org/10.1021/ja01531a012· OSTI ID:4223421

Sawyer, D T; George, R S; Bagger, J B

An investigation of polarographic methods for the determination of ruthenium led to a systematic study of the complexes of ruthenium(III) with the gluconate ion. A reversible polarographic wave, which is independent of pH and gluconate ion concentration, is obtained above pH 13 for the reduction of ruthenium(III). In 0.2 F sodium gluconate at pH 14 the reduction wave has a half- wave potential of -0.67 v vs. S.C.E. and diffusion current constant of 1.17. When an excess of ruthenium(III) is added to a basic gluconate solution, soluble polymers are formed initially which have a molar ratio of metal to gluconate of approximately 6. The polymers hydrolyze slowly to give ruthenium oxide and a stable complex with a molar ratio of one ruthenium(III) per gluconate ion. Spectrophotometric studies of this stable complex indicate that there are two forms, one from pH 3.5 to 7.5 and a second above pH 8. The second form of the complex follows Beer's law when a ten-fold excess of gluconate ion is present and the pH is 14. The molar absorptivity is 4170 at 337 m mu . In basic gluconate solutions ruthenium(II) and ruthenium(III) exhibit a complex set of equilibria which were studied polarographically. Reaction mechanisms are proposed for the equilibria on the basis of the polarographic studies. (auth)

• Research Organization: Univ. of California, Riverside
• Sponsoring Organization: USDOE
• NSA Number: NSA-14-003494
• OSTI ID: 4223421
• Journal Information: Journal of the American Chemical Society (U.S.), Journal Name: Journal of the American Chemical Society (U.S.) Vol. Vol: 81; ISSN JACSA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ACIDITY
CHEMISTRY
DIFFUSION
GLUCONIC ACID
HYDROLYSIS
ORGANIC ACIDS
PHOTOMETRY
POLAROGRAPHY
POLYMERS
REACTION KINETICS
RUTHENIUM COMPLEXES
RUTHENIUM OXIDES
SPECTRA