Formation of mononuclear rhodium(III) sulfates: 103Rh and 17O NMR study

It was shown that the monomeric rhodium sulfate complexes [Rh(H 2 O) 4 (SO 4 )] + , trans -[Rh(H 2 O) 2 (SO 4 ) 2 ] − , cis -[Rh(H 2 O) 2 (SO 4 ) 2 ] − , and [Rh(SO 4 ) 3 ] 3− were not predominant forms in aqueous solutions. The 103 Rh NMR chemical shifts of the complexes were assigned, and the cond...

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Bibliographic Details
Published in:Russian journal of coordination chemistry 2009-08, Vol.35 (8), p.577-581
Main Authors: Belyaev, A. V., Fedotov, M. A., Vorob’eva, S. N.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Inorganic Chemistry
Physical Chemistry
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Summary:It was shown that the monomeric rhodium sulfate complexes [Rh(H 2 O) 4 (SO 4 )] + , trans -[Rh(H 2 O) 2 (SO 4 ) 2 ] − , cis -[Rh(H 2 O) 2 (SO 4 ) 2 ] − , and [Rh(SO 4 ) 3 ] 3− were not predominant forms in aqueous solutions. The 103 Rh NMR chemical shifts of the complexes were assigned, and the conditions for their formation in solutions, concentration parameters, and acidity at which the fraction of the monomers was maximal were determined. The constants of formation of the complexes and ion pair (IP) were estimated: K IP = 8 ± 3.5, K 1 ≈ 8, K 2 trans ≈ 1, K 2 cis ≈ 1, and K 3 ≈ 2.
ISSN:1070-3284
1608-3318
DOI:10.1134/S1070328409080041