SYNTHESIS OF COMPLEXES OF Cu(II) AND VO(IV) WITH HYDRAZIDE OF MALEIC AND HYDRAZINEDIACETIC ACID

Abstract

The work demonstrated that hydrazide of maleic and hydrazine diacetic acid(L-2,2'-(2-(3- carboxyacryloyl)hydrazine-1,1-diil)diacetic acid) forms mononuclear complexes [CuL(H2O)2] and [VОL(H2O)2]. The structure and physical properties of these complex compounds have been studied by IR, UV spectroscopy and thermogravimetric methods of analysis. On the basis of the data obtained, the structure of the complexes was proposed, in which the metal ion is coordinated by two oxygen atoms and one nitrogen atom of the aminodiacetic fragment. In the electronic spectra of the copper complex, there are absorption bands of the transition at ~240 nm (related to charge transfer) and one d-d transition 740 nm. In the electronic spectra of the vanadyl complex, several absorption bands are observed at 300 nm (inflection), ~625 nm (inflection), and 780 nm, which can be attributed to d–d transitions of the VO2+in the low symmetry ligand environment. The five-coordinated structure of the complex is carried out by two oxygen atoms of two water molecules. The EPR spectrum of the polycrystalline [CuL(H2O)2] complex at room temperature indicates a low symmetry of the complex and has three g -factor values: g1=2.30, g2=2.22; g3=2.11. Additionally, a hyperfine structure is observed due to 63.64Cu nuclei (nuclear spin 3/2) with a splitting constant of 80 G.