Synthesis,Characterisation and Thermal Decomposition of Double Sulphates of Al and Cr(III) with Diisopropylammonium Ion |
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Authors: | Jordanovska V Boyanov B Naumov P |
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Institution: | (1) Institute of Chemistry, Facultyof Natural Science and Mathematics, University St. Cyril and Methodius, 91000 Skopje, Macedonia;(2) Faculty of Chemistry, Plovdiv University Paissii Hilendarski, 4025 Plovdiv, Bulgaria |
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Abstract: | On evaporation at room temperature of an aqueous mixture of M(III) sulphate and diisopropylammonium sulphate in a molar ratio 1:3, double sulphates of Aland Cr as crystalline products
were obtained. The stoichiometry of the obtained compounds was determined by means of elemental and TG analysis. The above
compounds were characterized by their IR spectra and X-ray powder diffraction patterns, as well. It was found that they have
a general empirical formula M(CH3CHCH3)2NH2(SO4)2·6H2O and that they are isostructural.
TG, DTG and DTA curves were done in static air atmosphere from room temperature up to 1000°C. The dehydration of the compounds
takes place in one step and it points out that the six water molecules are bound in the same way. This assumption is confirmed
by their IR spectra, where single sharp HOH deformation band at 1694 cm-1 appears in both compounds.
The thermal decomposition of the anhydrous compounds starts at about 260°C and is very complex. This process takes place in
many steps which are not well resolved.
The diisopropylammonium sulphateis prepared from the diisopropylamine by neutralization up to pH 3–4 with diluted sulphuric
acid and permanent cooling in an ice-water bath.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | aluminium chromium double sulphates with diisopropylammonium identification sythesis thermal decomposition |
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