A study of the co-ordination behaviour of various 2-pyridylketones. Part II. Rhodium(III) complexes of 2-benzoylpyridine
- 1 January 1968
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 2153-2155
- https://doi.org/10.1039/j19680002153
Abstract
Reaction of rhodium trichloride and 2-benzoylpyridine (PhCOpy) in ethanol affords the complex Rh(PhCOpy)2Cl2,Rh(PhCOpy)Cl4. The cation has been obtained as perchlorate in yellow and orange isomeric forms. Both isomers have trans chloride ligands. Reaction of any of these compounds with boliing water gives Rh(PhCOpy)2Cl2,OH, a neutral six-co-ordinate rhodium(III) complex containing one unidentate 2-benzoyl-pyridine molecule co-ordinated via oxygen. Reflexing the last compound in aqueous ethanol gives a further neutral complex, Rh(PhCOpy)2Cl3 containing one molecule of benzoylpyridine co-ordinated through nitrogen only Another neutral complex [Rh(PhCOpy)Cl2,H2O],H2O is considered to arise from the aquation of the Rh(PhCOpy)Cl4 – anion. Corresponding bromo-complexes have been prepared and spectroscopic data, including assignments of rhodium–halogen stretching frequencies, are presented.Keywords
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