Abstract
The incorporation of the solvent pyridine into the Coordination Model for non-aqueous solvents is most illuminating with regards to the importance of non-specific solvation. This is a strongly coordinating solvent with poor solvating properties. The species formed when FeCl 3 is dissolved in pyridine have been investigated in both dilute and concentrated solutions over a mole ratio range of 0 to 10 moles of chloride per mole of iron(III). It has been shown that the three species formed which can be detected by ultraviolet-visible spectroscopy and molar conductance techniques are FeCl 4 −, (FeCl 3.nC 5H 5N) and a metastable species of low Cl −/Fe III ratio.
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