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Distinction of Tris(diimine)ruthenium(II) enantiomers chiral by virtue of helical chirality: temperature‐dependent deuterium NMR spectroscopy in partially oriented phases
Author(s) -
Szalontai Gábor,
Kovács Margit
Publication year - 2006
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1892
Subject(s) - chemistry , diimine , ruthenium , chirality (physics) , crystallography , enantiomer , ligand (biochemistry) , carbon 13 nmr , proton nmr , atmospheric temperature range , nuclear magnetic resonance spectroscopy , deuterium nmr , stereochemistry , organic chemistry , biochemistry , chiral symmetry breaking , physics , receptor , quantum mechanics , meteorology , nambu–jona lasinio model , quark , catalysis
2 H NMR spectra of perdeuterated tris(diimine)ruthenium(II) complexes have been recorded in lyotropic liquid crystalline phase formed by the chiral polypeptide, poly‐γ‐benzyl‐ L ‐glutamate (PBLG) and co‐solvents. It is demonstrated that the left‐ and right‐rotation isomers of these octahedral metal complexes with D 3 symmetry can be distinguished. The effects of temperature and ligand size on spectral resolution were also studied. Although in the case of free bipyridine ligands excellent optical resolution could be obtained at room temperature in the complexes studied, the increase in ligand size has a detrimental effect on the resolution. This can be compensated to some extent by elevating the sample temperature and decreasing the deuterium relaxation rates, but the available temperature range and therefore the applicability of the technique are limited. Copyright © 2006 John Wiley & Sons, Ltd.