Determination of Water Associated with Some Iron Acetylacetonates and Nickel Glyoximes Extracted into CHCI3

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Abstract
Utilizing the Karl Fischer titration technique for the quantitative determination of water, the number of water molecules associated with a molecule of chelate when extracted from water into chloroform was determined for five chelates in the acetylacetone and dimethylglyoxime types. In this investigation no increase in the number of associated water molecules was observed as the bulkiness of the ligand was increased by the substitution of electron-withdrawing groups for methyl groups on the ligand, nor was any increase noted when the metal ion in the chelate was less sterically hindered to the approach of water molecules than in the phenanthroline chelates. The fact that the chelate contains hydrogen-bonded sites does not appear to affect the number of water molecules associated with the chelates investigated here.