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2019 Journal of Agroalimentary Processes and Technologies 2019, 25(4)
 
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40 .   Synthesis, structural and spectroscopic characterization of unusual ternary dinuclear tetraperoxo vanadium(V)-glycine complexes

Authors: C. Gabriel, A. Salifoglou

Volume 17, Issue 3;
Pages: 225-228;
ISSN: 2069-0053 (print) (former: ISSN:1453-1399), Agroprint;
ISSN (online):2068 9551



Abstract:

Poised to understand the ternary V(V)-H2O2-amino acid interactions relevant to that metal ions biological role, we have launched synthetic efforts involving the physiological ligands glycine and H2O2. In a pH-specific fashion, V2O5, glycine and H2O2 reacted and afforded the unusual complexes (H3O)2[V2(O)2(n2:n2:n1-O2)2(n2-O2)2(C2H5NO2)]5/4H2O (1) and K2[V2(O)2(n2:n2:n1-O2)2(n2-O2)2(C2H5NO2)]H2O (2). Both complexes 1 and 2 were characterized by UV/Visible, FT-IR, Raman, NMR spectroscopy, cyclic voltammetry, and X-ray crystallography. The structures of 1 and 2 reveal the presence of unusual ternary dinuclear vanadium-tetraperoxo-glycine complexes containing [(VV=O)(O2)2] units interacting through long V-O bonds and an effective glycinate bridge. The latter ligand is present in the dianionic assembly as a bidentate moiety spanning both V(V) centers in a zwitterionic form.

Keywords: vanadium, peroxo glycine structure, amino acids, zwitterions

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