Solvation and Donor Properties

While the formation of an anionic complex is supported by a low donor number of the solvent and by high donor properties of X, the formation of solvated cations (ionization) is favoured by a high donor number of the solvent. Autocomplex formation will be expected to occur, when the donor properties of solvent and anionic ligand are similar. [Pg.31]

Examples of autocomplex formation can be seen from Table 10, where A (= anionic complex) denotes the ready formation of complex anions in the presence of the competitive anionic ligand X. [Pg.31]

Donor Number (Donor Numbers in Parenthesis) A Formation of Anionic Complexes [Pg.31]

A more detailed discussion has been attempted in Chapter VIII. [Pg.31]

Similar results are found for iron (III) compounds. While FeCls undergoes autocomplex formation in triethylphosphate (DNsbCh = 23) it is simply ionized in a solvent of higher DNsbCh, such as dimethyl sulphoxide 60. Ferric chloride prefers to form tetrachloroferrate in a solvent of much lower donor number, for example phosphorus oxychloride (DNsbCU = H)- With a stronger competitive ligand, such as azide, autocomplex formation is found in dimethyl sulphoxide, where with the stronger donating cyanide ion anionic cyanocomplexes are easily formed . [Pg.31]

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