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1 Polish Journal of Chemistry

1 2002

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Thermal, Spectral and Magnetic Studies of Mn(II), Co(II), Ni(II), Cu(II) and Zn (II) Complexes with Mesaconic Acid

Brzyska W., Zamojska A.

Polish Journal of Chemistry

2002

Vol. 76 / nr 5

631-635

Conditions for the preparation of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) mesaconates were investigated and their quantitative composition and magnetic moments were determined. The IR spectra and powder diffractograms of the complexes prepared with general formula M(C5H4O4).nH2O (where n = 3 forMn,Co, n = 2 forNi,Cu and n = 0 forZn) were recorded and their thermal decomposition in air was studied. During heating, the hydrated complexes are dehydrated in one (Ni, Co, Cu) or two (Mn) steps and next the anhydrous complexes of Mn(II) and Zn(II) decompose directly to oxides. The complex of Co(II) decomposes to oxide with intermediate formation of the free metal, whereas those of Ni(II) and Cu(II) complexes decompose to oxides with intermediate formation of mixture of free metal and its oxide. The effective magnetic moments for the paramagnetic complexes of Mn(II), Co(II), Ni(II) and Cu(II) attain values 5.32, 4.77, 3.12 and 1.73 B.M., respectively.