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Journal of the Chilean Chemical Society

On-line version ISSN 0717-9707

Abstract

FERENC, WIESLAWA; SADOWSKI, PAWEL; CRISTOVAO, BEATA  and  SARZYŃSKI, JAN. INVESTIGATION OF SOME PHYSICOCHEMICAL PROPERTIES OF 4-NITROCINNAMATES OF LANTHANIDES(III). J. Chil. Chem. Soc. [online]. 2013, vol.58, n.2, pp.1753-1758. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072013000200025.

Lanthanide(III) 4-nitrocinnamates were synthesized as polycrystalline hydrated solids with the general formulae: Ln(C9H6NO4)3OH2O (where Ln = lanthanons (without Ce(III)), n=1 for La, Pr-Tb and n=2 for Dy-Lu). The complexes were characterized by elemental analysis, FTIR spectroscopy, magnetic and thermogravimetric studies and also by X-ray diffraction (XRD) measurements. The carboxylate groups bind as bidentate chelating. On heating to 1173 K in air all compounds at first dehydrate in one stage to form anhydrous salts, that next with rising temperature are being directly decomposed (complexes of Pr(III) and Eu(III)) or with the intermediate formation of oxycarbonates (the rest of analysed compounds) to the oxides of respective metals. The gaseous products of compound thermal decomposition in nitrogen were also determined. The magnetic susceptibilities were measured over the ranges 76-303 K and 1.8-303 K, and their magnetic moments were calculated. The results show that 4-nitrocinnamates of lanthanides(III) are high-spin complexes with weak ligand field.

Keywords : lanthanides; complexes; thermal stability; magnetic properties; 4-nitrocinnamates.

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