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I am engaged with the preparation of VO(II) complexes with the different bidentate amine ligands and the oxalate ion. The starting complex (NH4)2VO(C2O4)2 has been prepared by literature method. The obtained complexes produced by the reaction of the starting salt and the diamine ligands assumed that they are paramagnetic VO(II), but when I do the H1NMR of the diamine complexes they give very good data for all the protons. I wonder if the oxalate can oxidize the VO(II) to V(V), and if yes why the oxalate don’t oxidase the starting salt.

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