103Rh and 17O NMR Study of Oligomer Rhodium(III) Sulfates in Aqueous Solutions
Russian Journal of Coordination Chemistry
, E-ISSN: 1608-3318
Nikolaev Institute of Inorganic Chemistry SB RAS
Boreskov Institute of Catalysis SB RAS
By virtue of 103Rh-, 17O-NMR, electrophoresis in agarose gel, and pH-metry, we report on the formation of rhodium(III) sulfate complexes in aqueous solutions. At higher concentrations of sulfuric acid (above 3 M), more than 90% of metal was found to stay in the state of symmetric polynuclear complexes containing magnetically equivalent rhodium atoms. We also labeled the 103Rh-NMR chemical shifts for the complexes with 3, 4 and 6 metal atoms in the spectra.