Collect. Czech. Chem. Commun.
2004, 69, 811-821
https://doi.org/10.1135/cccc20040811
Experimental and Theoretical Study of the First Vanadocene(IV) Complexes of α-Amino Acids Prepared from Vanadocene Dichloride
Jaromír Vinkláreka,*, Hana Paláčkováb and Jan Honzíčeka
a Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, nám. Čs. legií, 532 10 Pardubice, Czech Republic
b Department of Biological and Biochemical Science, Faculty of Chemical Technology, University of Pardubice, nám. Čs. legií, 532 10 Pardubice, Czech Republic
Abstract
The first bioinorganic vanadocene(IV) complexes of α-amino acids ([Cp2V(aa)]Cl, Cp = η5-C5H5, aa = glycine, L-alanine, L-valine) were prepared by reaction of vanadocene dichloride ([Cp2VCl2]) and α-amino acids in aqueous methanol. Analogous cationic complexes with PF6- counterions were obtained by metathetical reactions of the chloride precursors with KPF6. These compounds are of great interest as model systems for the vanadocene moiety binding to proteins. All complexes have been characterized by elemental analyses and IR, Raman and EPR spectroscopies. On the basis of EPR spectra, a chelate in all the studied complexes was proposed, formed by the carboxylato and amino groups. This structure has also been confirmed by density functional theory (DFT) calculations.
Keywords: Vanadocene dichloride; Metallocenes; Vanadium; Amino acids; Antitumor activity; EPR spectroscopy; Density functional theory; DFT calculations.
References: 30 live references.
