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https://hdl.handle.net/2440/4345
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Type: | Journal article |
Title: | Cyclodextrin and termethylated cyclodextrin complexation of aromatic carboxylic acids and their conjugate bases in aqueous solution. The effect of size, hydrophobicity and charge |
Author: | Hendrickson, K. Easton, C. Lincoln, S. |
Citation: | Australian Journal of Chemistry: an international journal for chemical science, 1995; 48(6):1125-1132 |
Publisher: | CSIRO |
Issue Date: | 1995 |
ISSN: | 0004-9425 1445-0038 |
Abstract: | <jats:p>For α- cyclodextrin ( αCD ), the complexation constants (K) for the formation of binary host-guest complexes ( HA.αCD ) are 750�60, 1070�60, 27�3 and 17�4 dm3 mol-1 when the guests (HA) are benzoic, 4-methylbenzoic and (R)- and (S)-2-phenylpropanoic acids, respectively, as determined by potentiometric titration in aqueous solution at 298.2 K and I = 0.10 mol dm-3 ( KCl ). For the analogous hexakis (2,3,6-tri-O-methyl)-α- cyclodextrin complexes ( HA.TMαCD ), K = 1580�150, 2890�130, 220�10 and 207�8 dm3 mol-1, and for the heptakis (2,3,6-tri-O-methyl)-β-cyclodextrin complexes ( HA.TMαCD ), K = 200�20, 340�30, 129�5 and 170�10 dm3 mol-1. The binary complexes formed by the corresponding carboxylates (A-) are much less stable. Ternary host-guest α- cyclodextrin complexes (HA.αCD2) are also formed. These data, together with literature data for β- cyclodextrin, are discussed in terms of the factors influencing complexation. </jats:p> |
DOI: | 10.1071/CH9951125 |
Published version: | http://dx.doi.org/10.1071/ch9951125 |
Appears in Collections: | Aurora harvest 2 Chemistry publications Environment Institute publications |
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