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Measurements of x-ray scattering from ferric chloride solution in the concentration range from 1.5M to 5M have been made. The radial distributions calculated from these measurements indicate a large degree of local ordering of the ions, with formation of Fe+3—Cl— complexes. At the highest concentration the [FeCl6]—3 ion appears to be the main species present. As the concentration is lowered the coordination of the Cl—s around Fe+3 becomes less definite and other species appear; in particular, the presence of Fe2Cl6 is indicated.
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George W. Brady (1958) studied this question.
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