Peroxo complexes of molybdenum(VI), uranium(VI), zirconium(IV) and thorium(IV) ions containing some amino acids

Abstract

Several new peroxo complexes of molybdenum(VI), uranium(VI), zirconium(IV) and thorium(IV) containing some bidentate amino acids have been synthesized and characterized. The complexes have the general formulae [M(O)(O₂)L<img src='http://www.niscair.res.in/jinfo/two.gif' border=0>] and [M'(O₂)L<img src='http://www.niscair.res.in/jinfo/two.gif' border=0>, [MO(O)(O₂)L’^2-H₂O and [M’(O₂)L’^2-H₂O][M=Mo(VI) and U(VI); M'=Zr(IV) and Th(IV); L^- = glycinate, leucinate: L’^2- = tyrosinate]. The complexes react with trans-stilbene, PPh₃, and AsPh₃ giving their oxides. The IR spectra of the complexes indicate that the frequency of the <em>v</em>₁-mode of the M(O₂) grouping. which is essentially an O - O stretch decrease with an increase in the atomic number of metal in a group.