Abstract
The solubilities of α-, β-, and γ-cyclodextrin have been measured in the presence of the first row transition metals: Cr3+, Mn2+, Fe3+, Co2+, Ni2+, Cu2+ and Zn2+; chlorides, nitrates and sulphates (in this case Fe2+), and, for companson, with CaCl2, the corresponding Group IIa salt. Where possible the measurements are reported as a function of the activity of the salts. In general, for the transition metals the sulphates all show a linear decrease in solubility with increasing salt activity: for the nitrates the solubility increases and then reaches a limiting value; and for the chlorides a small decrease in solubility is observed at low activity followed by an increase in solubility at higher salt activity. Circular dichroism measurements confirm that there is no direct complexation at non-basic pH.
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Eddaoudi, M., Coleman, A.W. & Junk, P.C. Solubilities of the cyclodextrins in the presence of transition metal salts. J Incl Phenom Macrocycl Chem 26, 133–151 (1996). https://doi.org/10.1007/BF01029938
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DOI: https://doi.org/10.1007/BF01029938