Formation of cobalt(II) halide complexes in molten mixtures of inorganic salts with polar organic compounds

Abstract

<p>U ovoj doktorskoj disertaciji proučavano je građenje&nbsp;kompleksa kobalta(II) sa hloridnim i &nbsp;bromidnim jonima u&nbsp;rastopima koji sadrže jednu neorgansku so i jedno organsko&nbsp;jedinjenje i/ili vodu pri različitom sastavu sistema i na različitim&nbsp;temperaturama. Jedan od sistema je amonijum-nitrat &ndash;&nbsp;acetamid &ndash; voda sastava NH₄NO₃∙(2,61-z)CH₃CONH₂∙zH₂O (z =&nbsp;0,0 1,61 i 2,61), a drugi sistem je amonijum&ndash;nitrat &ndash; dimetilsulfoksid&nbsp;(DMSO) sastava NH₄NO₃∙zDMSO (z = 1 &ndash; 6), &nbsp;na&nbsp;različitim temperaturama (35, 45, 55 i 65 ^oC).&nbsp;Cilj ovog istraživanja je bio određivanje stabilnosti&nbsp;kompleksa kobalta koji se grade sa sa halogenidnim jonima i&nbsp;komponentama rastvarača, pronalaženje kvalitativne i kvantitativne&nbsp;zavisnosti konstanti stabilnosti kompleksa kobalta(II) sa&nbsp;halogenidnim jonima od temperature i molskog odnosa&nbsp;komponenti sistema NH₄NO₃∙(2,61-z)CH₃CONH₂∙zH₂O odnosno &nbsp;NH₄NO₃∙zDMSO, određivanje termodinamičkih parametara koji&nbsp;karakteri&scaron;u reakcije asocijacije u ovim sistemima.</p>

<p>In this dissertation the complex formation between cobalt(II) and halide ions in the melts consisting of one inorganic salt, an organic compound and/or water has been studied at different temperatures. Two molten salt systems have been investigated: 1) &nbsp;ammonium nitrate-acetamide-water system NH₄NO₃∙(2,61-z)CH₃CONH₂∙zH₂O (z = 0.0 1.61 2.61) and 2) ammonium nitratedimethyl sulfoxide NH₄NO₃∙zDMSO (z = 1 &ndash; 6), at four different temperatures: 35, 45, 55 and 65 ^oC. The purpose of this work was to determine stability of cobalt(II) complexes formed with the halide ions and the components of the solvents, to discribe the qualitative and quantitative relationships between the stability of the complexes and the melt composition, as well as the changes in the cobalt(II) coordination due to a complex formation. Thermodynamic parameters for cobalt(II) &ndash; halide association process in these melts were alsodetermined.</p>