X-ray structure analysis, electronic and vibrational circular dichroism of chiral-at-metal dioxidovanadium(V) complexes with amino acids derived Schiff base ligands

The absolute configuration on the vanadium atom in five new chiral dioxidovanadium Schiff base complexes derived from l-valine, l-leucine, l-histidine, l-threonine and d-threonine is discussed by the means of X-ray single crystal analysis, electronic and vibrational circular dichroism. [Display omit...

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Bibliographic Details
Published in:Polyhedron 2014-10, Vol.81, p.421-427
Main Authors: Krivosudský, Lukáš, Schwendt, Peter, Gyepes, Róbert, Žák, Zdirad
Format: Article
Language:English
Subjects:
Absolute configuration
Chirality
Circular dichroism
Schiff bases
Vanadium complexes
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Summary:The absolute configuration on the vanadium atom in five new chiral dioxidovanadium Schiff base complexes derived from l-valine, l-leucine, l-histidine, l-threonine and d-threonine is discussed by the means of X-ray single crystal analysis, electronic and vibrational circular dichroism. [Display omitted] Five new chiral dioxidovanadium Schiff base complexes derived from l-valine, l-leucine, l-histidine, l-threonine and d-threonine were synthesized and characterized by elemental analysis, 1H and 51V NMR and IR spectra. The absolute configurations of the complexes were determined by X-ray single crystal analysis in solid state and by electronic and vibrational circular dichroism in CH3CN solution. The l-threoninato complex, which contains two stereogenic centers in the amino acid site, does not show epimerization of the amino acid, in contrast with the analogical isoleucine-derived complexes reported recently. Conglomerate crystallization was observed in racemic dl-valine- and dl-threonine-derived complexes.
ISSN:0277-5387
DOI:10.1016/j.poly.2014.06.052