Evaluation of the binding constants,bound chemical shifts,and equilibrium stoichiometry for the association of lanthanide shift reagents with carbohydrate derivatives |
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Authors: | Anita Arduini Ian M Armitage Laurance D Hall Alan G Marshall |
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Institution: | Department of Chemistry, The University of British Columbia, Vancouver 8, British Columbia Canada |
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Abstract: | The molecular associations of tris(dipivalomethanato)europium(III) (1) and of tris(2,2-dimethyl-6,6,7,7,8,8,8,-heptafluoro-3,5-octanedionato)europium(III) (2) with six carbohydrate derivatives have been studied. The interactions of 2 in deuterochloroform solution appear to be “normal”, i.e., the plot of sugar concentration] versus induced chemical-shift change]?1 is linear and can be interpreted in terms of the equilibrium binding constant (KB) and the bound chemical shifts (°B). Similar results are found for 1 in carbon tetrachloride solutions. However, in chloroform solutions, non-linear plots are obtained that cannot be simply interpreted. Possible reasons for this behaviour are given. |
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