Title
X-ray structure analysis, electronic and vibrational circular dichroism of chiral-at-metal dioxidovanadium(V) complexes with amino acids derived Schiff base ligands
Author
Lukáš Krivosudský, Peter Schwendt, Róbert Gyepes, Zdirad Žák
Year
2014
Journal
Polyhedron
Abstract
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.
Instrument
J-815
Keywords
Circular dichroism, Absolute configuration