866953-73-3Relevant academic research and scientific papers
Studies on adducts of rhodium(II) tetraacetate and rhodium(II) tetratrifluoroacetate with some amines in CDCl3 solution using 1H, 13C and 15N NMR
Ja?wiński, Jaros?aw
, p. 7 - 17 (2007/10/03)
1H, 13C and 15N NMR spectroscopy has been applied for investigation of amine adducts with rhodium(II) tetraacetate dimer and rhodium(II) tetratrifluoroacetate dimer in CDCl3 solution. Subsequent formation of two adducts, 1:1 and 2:1, was proved by NMR and VIS titration experiments, and by NMR measurements at reduced temperatures, from 233 to 273 K. The adduct formation shift, defined as Δδ= δadduct-δligand and characterizing complexation reaction, varies from ca. 0 to +1.6 ppm for 1H, from ca. -10 to +6 ppm for 13C and from -4.4 to -39 ppm for 15N NMR. Formation of N-Rh bond slows the inversiof on the nitrogen atom and generates, in the case of N-methyl-(1-phenylethyl)-amine, a nitrogenous chiral center in the molecule. VIS spectra of amine-dirhodium salt mixture contain two bands in the 532-597 nm spectral range, assigned to 1:1- and 2:1-adducts.
