Approaches towards the enantioselective recognition of anionic guest species using chiral receptors based on rhenium(i) and ruthenium(ii) with amide bipyridine ligands
Approaches towards the enantioselective recognition of anionic guest species using chiral receptors based on rhenium(i) and ruthenium(ii) with amide bipyridine ligands
作者:Lindsay H. Uppadine、F. Richard Keene、Paul D. Beer
DOI:10.1039/b102180j
日期:——
The syntheses of chiral anion receptors based on rhenium(I) and ruthenium(II) with amide bipyridine ligands are reported. The rhenium(I) hosts were prepared in moderate to high yields by co-ordinating chiral bipyridine ligands to a Re(CO)3Br centre. The ruthenium(II) receptors were synthesised via the chiral building blocks Λ- and Δ-[Ru(bpy)2(py)2]2+ or by chromatographic resolution on a SP Sephadex C-25 cation exchanger. Chiral purity was determined by 1H NMR and circular dichroism spectroscopy and lanthanide shift experiments. 1H NMR titration studies showed that these receptors bind chiral carboxylate anions in DMSO-d6, although significant chiral discrimination was not observed.
Novel Synthetic Routes to Several New, Differentially Substituted Ruthenium Tris(4,4‘-disubstituted-2,2-bipyridine) Complexes
作者:Dusan Hesek、Yoshihisa Inoue、Simon R. L. Everitt、Hitoshi Ishida、Mieko Kunieda、Michael G. B. Drew
DOI:10.1021/ic990840i
日期:2000.1.1
to the 4,4'-positions of the bpy ligands. It was postulated that these chiral groups would be capable of inducing chirality at the metal center, but our investigations have shown this not to be the case, and in all reactions completely racemic products were formed. Resolution by chiral HPLC, and the subsequent characterization of the products through NMR, UV-vis, and circular dichroism (CD) spectroscopy