Abstract
The complexes of 2-methoxyhenoxyacetates of Mn(II), Co(II), Ni(II) and Cu(II)with the general formula: M(C9H9O4)3·4H2O, where M(II) = Mn, Co, Ni and Cu have been synthesized and characterized by elemental analysis, IR spectroscopy, magnetic and thermogravimetric studies and also X-ray diffraction measurements. The complexes have colours typical for M(II) ions (Mn(II) - a pale pink, Co(II) - pink, Ni(II) - green, and Cu(II) – blue). The carboxylate group binds as monodentate and bidentate ligands. On heating to 1273K in air the complexes decompose in the same way. At first, they dehydrate in one step to anhydrous salts, that next decompose to the oxides of respective metals with the intermediate formation of the oxycarbonates. Their solubility in water at 293K is of the order of 10-5 mol·dm-3. The magnetic moments of analysed complexes were determined in the range of 76-303K. The results reveal them to be high-spin complexes of weak ligand fields.
Highlights
The carboxylates play an important role in inorganic and bioinorganic chemistry
From the survey of literature it follows that metal carboxylates may be applied for the productions of high degree purity of metal oxides and polycarboxylic acids are often used for supramolecular compound synthesis, which in many cases, form with metal ions the molecular polymers containing in their structures, pores and channels owning to them they appear catalytic and adsorption properties
Polycarboxylic acid may form the molecules with two- and three – dimentional structures, yielding special magnetic and luminescence properties which let them be used in optical and electronic industries [1,4,5]
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 [1,2,3]. As a continuation of our studies on carboxylates we decided to synthesize 2-methoxyphenoxyacetates with Mn(II), Co(II), Ni(II) and Cu(II) and to study some of their properties not to be investigated so far, such as magnetic properties in the range of 77-303K thermal stability in air at 293-1273K, solubility in water at 293K and to record their FTIR spectra. The FTIR spectra of the intermediate and final products obtained from the complex thermal decompositions were registered.
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