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Stereospecificity in vanadium Schiff base complexes: Formation, crystallization and epimerization processes.

Lukáš Krivosudský1, Peter Schwendt1, Ján Šimunek1

  • 1Department of Inorganic Chemistry, Comenius University, Faculty of Natural Sciences, Mlynská dolina, 842 15 Bratislava, Slovakia.

Journal of Inorganic Biochemistry
|February 15, 2015
PubMed
Summary
This summary is machine-generated.

This study determined the stereoisomer structures of a chiral vanadium complex using electronic and vibrational circular dichroism. Solubility differences were observed, influencing stereoisomer ratios during crystallization and epimerization.

Keywords:
Absolute configurationCircular dichroismInfrared spectroscopyIsoleucineSchiff basesVanadium complexes

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Area of Science:

  • Inorganic Chemistry
  • Stereochemistry
  • Spectroscopy

Background:

  • Chiral anions with multiple stereocenters present synthetic and characterization challenges.
  • Vanadium complexes with Schiff base ligands are of interest due to their diverse applications.
  • Understanding stereoisomerism is crucial for controlling chemical properties and reactivity.

Purpose of the Study:

  • To elucidate the structures of stereoisomers of the chiral anion [VO2(N-salicylidene-isoleucinato)](-).
  • To determine the absolute configuration of all four possible stereoisomers.
  • To investigate the stereoselective crystallization and epimerization behavior of these isomers.

Main Methods:

  • Absolute configuration determination using electronic circular dichroism (ECD) and vibrational circular dichroism (VCD).
  • Comparison of experimental VCD and infrared (IR) spectra with simulated spectra for spectral assignment.
  • Stereoselective crystallization experiments from binary mixtures of stereoisomers.
  • Observation of vanadium-catalyzed epimerization during crystallization.

Main Results:

  • The absolute configurations of all four stereoisomers (CSS, ARR, CSR, ARS) were successfully assigned.
  • Distinct differences in IR spectra, particularly in the aromatic CH stretching region, were observed between diastereomers.
  • The CSS and ARR stereoisomers exhibited lower solubility compared to CSR and ARS.
  • Vanadium-catalyzed epimerization occurred for CSR and ARS isomers under prolonged crystallization, favoring CSS and ARR formation.

Conclusions:

  • ECD and VCD are powerful techniques for differentiating and assigning absolute configurations of complex chiral molecules.
  • Solubility differences and epimerization kinetics play a significant role in the stereoisomeric composition of crystallization products.
  • The study provides insights into the stereochemical control in vanadium-isoleucine complexes.