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https://hdl.handle.net/2440/4333
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Type: | Journal article |
Title: | Complexes of 6A-(2-amino-ethyl-amino)-6A-deoxy-b-cyclodextrin and 6A-deoxy-6A-[bis-(carboxyl-atomethyl)amino]-b-cyclodextrin with (R)- and (S)-tryptophanate and (R)- and (S)-phenyl-alaninate in aqueous solution. A pH-titrimetric and n.m.r. spectroscopic s |
Author: | Sandow, M. May, B. Clements, P. Easton, C. Lincoln, S. |
Citation: | Australian Journal of Chemistry: an international journal for chemical science, 1999; 52(12):1143-1150 |
Publisher: | CSIRO PUBLISHING |
Issue Date: | 1999 |
ISSN: | 0004-9425 1445-0038 |
Abstract: | <jats:p> The 1 : 1 host–guest complexes formed by 6A-(2-aminoethylamino)-6A-deoxy-β-cyclodextrin and (R)- and (S)-tryptophanate are characterized by log(K/dm3 mol–1) = 4.83±0.02 and 4.72±0.03, respectively, and for those formed with (R)- and (S)-phenylalaninate log(K/dm3 mol–1) = 3.82±0.05 and 4.12±0.02, respectively, in aqueous solution at 298.2 K and I = 0.10 mol dm–3 (NaClO4), where K is the stability constant. The corresponding values for the analogous complexes formed by 6A-[bis(carboxylatomethyl)amino]-6A-deoxy-β-cyclodextrin are 3.4±0.1, 3.3±0.1, 4.02±0.06 and 4.00±0.06, respectively. Host–guest complexes are also formed by the monoprotonated substituted β-cyclodextrins. 1H n.m.r. spectroscopy (ROESY) indicates that the guests are complexed with their indole and phenyl entities inside the annuli of the substituted β-cyclodextrin hosts.</jats:p> |
DOI: | 10.1071/CH99102 |
Published version: | http://dx.doi.org/10.1071/ch99102 |
Appears in Collections: | Aurora harvest 6 Chemistry publications Environment Institute publications |
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