Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/4693
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Type: Journal article
Title: Complexation of Methyl Orange and Tropaeolin 000 No. 2 by β-cyclodextrin dimers
Other Titles: Complexation of Methyl Orange and Tropaeolin 000 No. 2 by beta-cyclodextrin dimers
Author: Haskard, C.
May, B.
Kurucsev, T.
Lincoln, S.
Easton, C.
Citation: Journal of the Chemical Society, Faraday Transactions, 1997; 93(2):279-282
Publisher: ROYAL SOC CHEMISTRY
Issue Date: 1997
ISSN: 0956-5000
1364-5455
Statement of
Responsibility: 
Carolyn A. Haskard, Bruce L. May, Tomas Kurucsev, Stephen F. Lincoln and Christopher J. Easton
Abstract: Spectrophotometric studies of the complexation of Methyl Orange (MO-) and Tropaeolin 000 No. 2 (TR-) anions by dimeric N,N′-bis(6A-deoxy-6A-β-cyclodextrin)urea (βCD)2ur and its oxalamide and succinamide analogues, (βCD)2ox and (βCD)2su, respectively, are consistent with the predominant formation of complexes of the general formulae (βCD)2x·MO- characterized by stability constants K1 = (1.05 ± 0.04) × 105, (1.92 ± 0.04) × 105 and (2.50 ± 0.02) × 104 dm3 mol-1 and (βCD)2x·TR- characterized by K1 = (1.39 ± 0.03) × 104, (7.4 ± 0.1) × 103 and (4.60 ± 0.05) × 103 dm3 mol-1, in aqueous phosphate buffer at pH 9.0 and 5.5 and 298.2 K. These values are significantly greater than K1 = 2160 and 710 dm3 mol-1 for the β-cyclodextrin complexes, βCD·MO- and βCD·TR- and are indicative of cooperative binding in (βCD)2x·MO- and (βCD)2x·TR-. The factors affecting complex stability are discussed and comparisons are made with related systems.
DOI: 10.1039/A603638D
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