Magnetic, thermal and spectral characterization of 2,4-dimethoxybenzoates of Mn(II), Co(II) and Cu(II)

• Autor(a) principal: Ferenc,W.
• Data de Publicação: 2007
• Outros Autores: Czapla,K., Sarzy,J.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Eclética Química
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-46702007000300001
• topic: 2,4-dimethoxybenzoates; magnetic properties of Mn(II), Cu(II), Co(II) and Nd(III); thermal stability; IR spectra

2,4 - Dimethoxybenzoates of Mn(II), Co(II) and Cu(II) have been synthesized as hydrated or anyhydrous polycrystalline solids and characterized by elemental analysis, IR spectroscopy, magnetic studies and X-ray diffraction measurements. They possess the following colours: Mn(II) - white, Co(II) - pink and Cu(II) - blue. The carboxylate groups bind as monodentate, or a symmetrical bidentate bridging ligands and tridentate. The thermal stabilities were determined in air at 293-1173K. When heated the hydrated complexes dehydrate to from anhydous salts which are decomposed to the oxides of respective metals. The magnetic susceptibilites of the 2,4-dimethoxybenzoates were measured over the range 76-303 K and their magnetic moments were calculated. The results reveal the complexes of Mn(II), Co(II) to be high-spin complexes and that of Cu(II) to form dimer.