Abstract
The complexes of 2,6-dimethoxybenzoic acid anion with ions of Co(II), Ni(II), and Cu(II) have been synthesized as polycrystalline solids, and characterized by elemental analysis, spectroscopy, magnetic studies, and also by X-ray diffraction and thermogravimetric measurements. The analysed complexes have following colours: pink for Co(II), green for Ni(II), and blue for Cu(II) compounds. The carboxylate group binds as monodentate, and bidentate bridging and chelating ligands. On heating in air to 1173 K the complexes decompose in four, three or two steps. At first, they dehydrate in one or two steps to anhydrous salts, that next decompose to oxides of the respective metals. The solubility of the investigated dimethoxybenzoates in water at 293 K is of the order of 10-2 mol/dm3. Their magnetic moments were determined in the temperature range of 76-303 K. The results reveal the compounds of Co(II) and Ni(II) to be high-spin complexes and that of Cu(II) to form dimer.
Highlights
The carboxylates play an important role in inorganic and bioinorganic chemistry
The compounds were characterized by elemental analysis (Table 1), and FTIR spectra
The separations of the νas(OCO-), and νs(OCO-) modes in the compounds, ∆ν(OCO-), are greater or smaller than that of the sodium salt (∆νOCO- = 200 cm-1). It indicates the different participations of ionic bonds in 2,6-dimethoxybenzoates compared to that of the sodium salt
Summary
The carboxylates play an important role in inorganic and bioinorganic chemistry. Many metal cations in a great number of various biological processes are a component of several vitamins and drugs [1, 2]. The complexes of 2,6-dimethoxybenzoates of Co(II), Ni(II), and Cu(II) were obtained as polycrystalline products with a metal ion to ligand ratio of 1 : 2 and the general formula M(C9H9O4)2⋅nH2O, where M(II)=Co, Ni, Cu, Figure 4. Dependence between magnetic susceptibility (1) and magnetic moment (2) values vs temperature for 2,6-dimethoxybenzoate of Cu(II).
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